{"id":533828,"date":"2026-03-29T13:25:54","date_gmt":"2026-03-29T11:25:54","guid":{"rendered":"https:\/\/www.dynseo.com\/surcharge-sensorielle-quest-ce-que-cest-et-comment-aider-un-cerveau-submerge-dynseo-2\/"},"modified":"2026-03-29T13:28:41","modified_gmt":"2026-03-29T11:28:41","slug":"sensory-overload-what-it-is-and-how-to-help-an-overwhelmed-brain","status":"publish","type":"post","link":"https:\/\/www.dynseo.com\/en\/sensory-overload-what-it-is-and-how-to-help-an-overwhelmed-brain\/","title":{"rendered":"Sensory Overload: What It Is and How to Help an Overwhelmed Brain"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Article HTML&#8221; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row admin_label=&#8221;Contenu&#8221; _builder_version=&#8221;4.16&#8243; width=&#8221;100%&#8221; max_width=&#8221;100%&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; 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24px;font-size:13px;}\n.dbi-art-2bc313 .internal-link {flex-direction:column;text-align:center;gap:12px;padding:22px 18px;}\n.dbi-art-2bc313 .internal-link-arrow {transform:rotate(90deg);}\n.dbi-art-2bc313 .internal-link:hover .internal-link-arrow {transform:rotate(90deg) translateX(4px);}\n.dbi-art-2bc313 .toc {padding:22px 20px;}\n}<\/p>\n<\/style>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"Article\",\n  \"headline\":\"Surcharge Sensorielle : Qu'est-ce que c'est et Comment Aider un Cerveau Submerg\u00e9\",\n  \"description\":\"Surcharge sensorielle : m\u00e9canismes, signes, profils concern\u00e9s et strat\u00e9gies concr\u00e8tes pour aider un cerveau submerg\u00e9. Guide complet pour familles et professionnels.\",\n  \"author\":{\"@type\":\"Organization\",\"name\":\"DYNSEO\",\"url\":\"https:\/\/www.dynseo.com\"},\n  \"publisher\":{\"@type\":\"Organization\",\"name\":\"DYNSEO\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/www.dynseo.com\/wp-content\/uploads\/2021\/03\/logo-dynseo.png\"}},\n  \"datePublished\":\"2026-03-28\",\n  \"dateModified\":\"2026-03-28\"\n}\n<\/script><\/p>\n<div class=\"dbi-art-2bc313\">\n<header class=\"article-hero\">\n<div class=\"article-hero-inner\">\n<nav class=\"article-breadcrumb\">\n      <a href=\"https:\/\/www.dynseo.com\/en\/\">Home<\/a> &rsaquo;<br \/>\n      <a href=\"https:\/\/www.dynseo.com\/en\/our-tools\/\">Tools &amp; resources<\/a> &rsaquo;<br \/>\n      Sensory overload<br \/>\n    <\/nav>\n<p>    <span class=\"article-category\">&#x1F50A; SENSORY &amp; COGNITION<\/span><\/p>\n<h1>Sensory Overload&nbsp;: what is it and how to <span class=\"hl\">help an overwhelmed brain<\/span><\/h1>\n<div class=\"article-meta\">\n      <span>&#x1F4C5; March 2026<\/span><br \/>\n      <span>&#x23F1; 18 min read<\/span><br \/>\n      <span>&#x1F3EB; By the DYNSEO team<\/span>\n    <\/div>\n<\/p><\/div>\n<div class=\"article-hero-curve\"><\/div>\n<\/header>\n<div class=\"container\">\n<article class=\"article-body\">\n<div class=\"toc\">\n<h4>&#x1F4D1; Summary<\/h4>\n<ol>\n<li><a href=\"#definition\">What is sensory overload?<\/a><\/li>\n<li><a href=\"#filtrage\">How the brain filters sensory information<\/a><\/li>\n<li><a href=\"#signes\">The signs of sensory overload<\/a><\/li>\n<li><a href=\"#profils\">The most affected profiles<\/a><\/li>\n<li><a href=\"#meltdown\">Autistic meltdown: understanding and distinguishing<\/a><\/li>\n<li><a href=\"#environnement\">Adapting the environment to prevent overload<\/a><\/li>\n<li><a href=\"#strategies\">Calming down strategies<\/a><\/li>\n<li><a href=\"#enfants\">Supporting a child in sensory overload<\/a><\/li>\n<li><a href=\"#adultes\">Managing sensory overload in adulthood<\/a><\/li>\n<li><a href=\"#professionnels\">For professionals: tools and approaches<\/a><\/li>\n<\/ol>\n<\/div>\n<pee>A classroom with 28 students all talking at the same time. A shopping mall on Saturday afternoon with its noises, lights, and food smells. A birthday party with balloons popping, loud music, and children running around. For most people, these environments are simply lively \u2014 perhaps tiring. For some brains, they are literally unbearable.<\/pee>\n<pee><strong>Sensory overload<\/strong> \u2014 also called sensory hypersensitivity or sensory cognitive overload \u2014 occurs when the brain receives more sensory information than it can process effectively. The nervous system, overwhelmed, triggers an intense stress response that can range from simple discomfort to a panic attack or meltdown. This phenomenon is particularly common among autistic people, ADHD, highly sensitive people (HSP), and anxious individuals \u2014 but it can affect anyone under sufficiently intense conditions.<\/pee>\n<pee>Understanding sensory overload \u2014 its mechanisms, signs, triggers, and strategies to help \u2014 is a fundamental skill for anyone supporting neurodivergent individuals: parents, teachers, healthcare professionals, but also for the individuals concerned themselves.<\/pee>\n<div class=\"key-points\">\n<h3>&#x2728; What you will learn in this article<\/h3>\n<ul>\n<li>The neurological mechanisms of sensory filtering<\/li>\n<li>The behavioral, cognitive, and emotional signs of overload<\/li>\n<li>The most affected neurological profiles (autism, ADHD, HSP)<\/li>\n<li>The difference between meltdown, shutdown, and anxiety attack<\/li>\n<li>Concrete strategies for adaptation and calming down<\/li>\n<li>Tools to support children and adults<\/li>\n<\/ul>\n<\/div>\n<h2 id=\"definition\">1. What is sensory overload?<\/h2>\n<pee>Sensory overload occurs when the intensity or quantity of sensory stimuli \u2014 visual, auditory, tactile, olfactory, proprioceptive \u2014 exceeds the processing and filtering capacity of the nervous system. The brain, unable to process, prioritize, and inhibit all the information that arrives simultaneously, shifts into a state of over-activation that triggers stress and avoidance responses.<\/pee>\n<pee>It is important to understand that sensory overload is not an excessive or irrational reaction. For the brain experiencing it, the stimuli are not &#8220;too strong in absolute terms&#8221; \u2014 they are <strong>too strong for that specific brain<\/strong>, because its sensory processing threshold is different. It is not a matter of emotional sensitivity or lack of will \u2014 it is a real neurological difference in how the nervous system processes and filters sensory information.<\/pee>\n<div class=\"info-box\">\n  <pee><strong>&#x1F4CA; The prevalence of sensory hypersensitivity.<\/strong> Significant sensory processing difficulties affect between 5% and 16% of the general population according to studies, with a much higher prevalence in certain neurodevelopmental profiles: about 70-90% of autistic people, 40-60% of people with ADHD, and by definition 100% of &#8220;Highly Sensitive Persons&#8221; (HSP). Sensory overload is therefore not a rare phenomenon \u2014 it concerns a significant proportion of the population, often unidentified.<\/pee>\n<\/div>\n<h2 id=\"filtrage\">2. How the brain filters sensory information<\/h2>\n<h3>The reticular formation: the main filter<\/h3>\n<pee>The human brain continuously receives a colossal flow of sensory information \u2014 estimated at about 11 million bits per second for visual and auditory channels alone. Yet, consciousness processes only a tiny fraction \u2014 about 40 to 50 bits per second. This radical filtering is ensured by several neurological mechanisms, including the <strong>ascending reticular activating formation<\/strong> (ARAF) in the brainstem, which acts as a first-level filter by selecting information that is salient enough to deserve conscious attention.<\/pee>\n<h3>The thalamus: sensory dispatcher<\/h3>\n<pee>The <strong>thalamus<\/strong> is the next step in filtering \u2014 it receives almost all sensory information and distributes it to the appropriate cortical regions. In some individuals, the thalamus filters information less effectively \u2014 more background sensory noise reaches the cortex, which then has to work harder to process relevant information. This less effective &#8220;thalamic gating&#8221; is one of the proposed mechanisms to explain sensory hypersensitivity in autism.<\/pee>\n<h3>The prefrontal cortex: attention regulator<\/h3>\n<pee>The prefrontal cortex plays a key role in the top-down regulation of sensory processing \u2014 it can amplify or inhibit the processing of certain information based on ongoing goals. When the resources of the prefrontal cortex are depleted \u2014 due to fatigue, stress, or high cognitive load \u2014 this top-down regulation becomes less effective, and sensory information &#8220;leaks&#8221; more. This is why sensory overload is more frequent at the end of the day, in stressful situations, or after intense cognitive effort.<\/pee>\n<h2 id=\"signes\">3. Signs of sensory overload<\/h2>\n<div class=\"sign-grid\">\n<div class=\"sign-card\">\n<div class=\"sign-card-title\">&#x1F6B6; Behavioral signs<\/div>\n<ul>\n<li>Seeking to isolate oneself or escape the environment<\/li>\n<li>Covering ears, eyes, or mouth<\/li>\n<li>Intensified self-regulation behaviors (rocking, flapping)<\/li>\n<li>Irritability, seemingly unexplained aggression<\/li>\n<li>Refusal to enter certain places<\/li>\n<\/ul><\/div>\n<div class=\"sign-card\">\n<div class=\"sign-card-title\">&#x1F9E0; Cognitive signs<\/div>\n<ul>\n<li>Difficulty concentrating or responding to questions<\/li>\n<li>Confusion, disorientation, slowing of thought<\/li>\n<li>Inability to make even simple decisions<\/li>\n<li>Forgetting words or usual procedures<\/li>\n<li>Feeling &#8220;cloudy&#8221;<\/li>\n<\/ul><\/div>\n<div class=\"sign-card\">\n<div class=\"sign-card-title\">&#x1F62C; Emotional signs<\/div>\n<ul>\n<li>Sudden and intense anxiety<\/li>\n<li>Tears or crying spells for no apparent reason<\/li>\n<li>Feeling overwhelmed, overpowered<\/li>\n<li>Restlessness, inability to stay still<\/li>\n<li>Feeling a sense of panic or urgency to &#8220;get out&#8221;<\/li>\n<\/ul><\/div>\n<div class=\"sign-card\">\n<div class=\"sign-card-title\">&#x1F4AA; Physical signs<\/div>\n<ul>\n<li>Headaches or migraines<\/li>\n<li>Nausea or digestive disorders<\/li>\n<li>Sudden and intense fatigue<\/li>\n<li>Muscle tension, jaw clenching<\/li>\n<li>Palpitations, hot flashes<\/li>\n<\/ul><\/div>\n<\/div>\n<pee>These signs can appear in isolation or in combination, and their intensity varies according to the person&#8217;s profile and the level of overload. An important point: <strong>the signs may not be visible from the outside<\/strong>. Many people, especially adults and children who engage in &#8220;masking,&#8221; internalize the overload \u2014 hiding it until the breaking point, making it difficult for those around them to detect.<\/pee>\n<h2 id=\"profils\">4. The most affected profiles<\/h2>\n<h3>Autism Spectrum Disorder (ASD)<\/h3>\n<pee>Atypical sensory sensitivity is now part of the diagnostic criteria for ASD in the DSM-5. It can take two forms: hypersensitivity (excessive reaction to stimuli) and hyposensitivity (insufficient reaction, needing intense stimuli to perceive them). Many autistic individuals present a mix of both, with different profiles depending on the sensory channels \u2014 hypersensitive to sounds but hyposensitive to textures, for example.<\/pee>\n<div class=\"tool-box\">\n<div class=\"tool-box-label\">&#x1F9EA; DYNSEO Tool<\/div>\n<div class=\"tool-box-title\">Sensory Needs Map ASD<\/div>\n<pee>The Sensory Needs Map ASD from DYNSEO helps identify and visualize the sensory profile of an autistic child \u2014 which channels are over-reactive, which are under-reactive \u2014 to adapt the environment and activities to their specific needs.<\/pee>\n  <a href=\"https:\/\/www.dynseo.com\/en\/our-tools\/asd-sensory-needs-map\/\" class=\"btn-tool\">Discover the tool &#x2192;<\/a>\n<\/div>\n<h3>ADHD<\/h3>\n<pee>Difficulties in inhibition and attentional filtering in ADHD make the brain more vulnerable to sensory overload. Without effective filtering of irrelevant stimuli, more information reaches consciousness \u2014 which can quickly exceed processing resources and generate overload. Sensory overload in ADHD is often fluctuating \u2014 well-managed in certain states (high motivation, low cognitive load), unbearable in others (fatigue, stress, rich environment).<\/pee>\n<h3>Highly Sensitive People (HSP)<\/h3>\n<pee>The concept of &#8220;Highly Sensitive Person&#8221; (HSP), introduced by Elaine Aron in the 1990s, describes individuals whose nervous system is constitutionally more reactive to stimuli \u2014 both internal and external. HSPs are not neurotypical &#8220;with more sensitivity&#8221; \u2014 their difference in sensory and emotional processing is structural. Sensory overload is a common experience for HSPs, particularly in environments rich in social stimuli.<\/pee>\n<h3>Anxiety and Chronic Stress<\/h3>\n<pee>Anxiety lowers the threshold for sensory processing \u2014 an anxious brain perceives stimuli as more intense and threatening. Chronic stress, through prolonged cortisol secretion, gradually degrades prefrontal sensory filtering. This vicious circle (overload \u2192 anxiety \u2192 increased overload) is important to understand in order to support anxious individuals in stimulating environments.<\/pee>\n<h2 id=\"meltdown\">5. Autistic Meltdown: Understanding and Distinguishing<\/h2>\n<pee>In the context of autism, sensory overload can lead to what is called a <strong>meltdown<\/strong> \u2014 an intense, often dramatic crisis that occurs when the nervous system has reached its breaking point. The meltdown is not a tantrum, manipulation, or whim \u2014 it is the neurological consequence of an overloaded nervous system that has exhausted all its regulatory resources.<\/pee>\n<pee>It is important to distinguish the meltdown from the <strong>shutdown<\/strong> \u2014 another possible response to overload, where the person shuts down, withdraws, no longer responds, and seems &#8220;absent.&#8221; Both are survival responses of the nervous system to overload \u2014 one by explosion (the meltdown), the other by collapse (the shutdown). Neither is voluntarily controllable in the moment.<\/pee>\n<div class=\"alerte-box\">\n<div class=\"alerte-box-title\">&#x26A0;&#xFE0F; What to do \u2014 and not do \u2014 during a meltdown<\/div>\n<pee><strong>Do:<\/strong> Immediately reduce stimuli (lights, sounds, number of people), remain calm and non-verbal, offer a safe and predictable space, do not touch without permission, wait for the crisis to unfold safely.<\/pee>\n  <pee style=\"margin-top:8px;\"><strong>Do not do:<\/strong> Try to reason or explain during the crisis (the prefrontal cortex is inaccessible), punish, touch without consent, increase stimuli to &#8220;calm&#8221; (speak loudly, turn on screens), force to &#8220;pull oneself together.&#8221;<\/pee>\n<\/div>\n<p><a href=\"https:\/\/www.dynseo.com\/nos-outils\/strategies-retour-au-calme\/\" class=\"internal-link\"><\/p>\n<div class=\"internal-link-icon\">&#x1F9D8;<\/div>\n<div class=\"internal-link-content\">\n<div class=\"internal-link-label\">DYNSEO Tool<\/div>\n<div class=\"internal-link-title\">12 Strategies for Calming Down<\/div>\n<div class=\"internal-link-desc\">12 validated techniques to help the nervous system regulate after sensory overload \u2014 suitable for children and adults.<\/div>\n<\/p><\/div>\n<div class=\"internal-link-arrow\">&#x2192;<\/div>\n<p><\/a><\/p>\n<h2 id=\"environnement\">6. Arrange the environment to prevent overload<\/h2>\n<pee>The best intervention against sensory overload is <strong>prevention<\/strong> \u2014 arranging environments to reduce problematic stimuli before they reach the overload threshold.<\/pee>\n<ul class=\"numbered-list\">\n<li><strong>Reduce unnecessary sound sources:<\/strong> Noise-canceling headphones or earplugs in noisy environments, reduce background noise (TV, background music), prefer floor coverings and textiles that absorb sound rather than reflective surfaces.<\/li>\n<li><strong>Optimize lighting:<\/strong> Replace flickering fluorescent lights with stable LED lighting, use blackout curtains to regulate brightness, offer sunglasses for very bright environments, prefer indirect lighting.<\/li>\n<li><strong>Provide decompression spaces:<\/strong> A quiet corner accessible at any time \u2014 at home, in class, at work \u2014 where the person can retreat to regulate. This space should have reduced stimuli (little noise, little light, few people) and calming sensory objects if desired.<\/li>\n<li><strong>Structure transitions:<\/strong> Unpredictability amplifies overload. Anticipate upcoming changes, use visual schedules, give warnings before transitions \u2014 these practices reduce anticipatory anxiety that lowers the sensory tolerance threshold.<\/li>\n<li><strong>Plan regular sensory breaks:<\/strong> Before reaching overload, regular breaks in a calm environment allow the nervous system to &#8220;discharge&#8221; the accumulation of stimuli. These breaks are particularly important during long days in rich environments (school, open space work).<\/li>\n<\/ul>\n<h2 id=\"strategies\">7. Strategies for calming down<\/h2>\n<pee>When sensory overload is already present, several strategies can help the nervous system regulate. The common point of these strategies is that they <strong>activate the parasympathetic nervous system<\/strong> \u2014 the &#8220;rest and recovery&#8221; system \u2014 in response to the activation of the sympathetic system of overload.<\/pee>\n<pee><strong>Slow abdominal breathing<\/strong> is one of the most accessible and well-validated techniques: exhaling longer than inhaling (for example: inhale for 4 counts, exhale for 6-8 counts) directly activates the vagus nerve and the parasympathetic system. <strong>Proprioceptive pressure<\/strong> \u2014 a heavy blanket, arm compression, a firm consensual hug \u2014 has documented calming effects, likely via the deep pressure receptors in the skin. <strong>Immersion in silence and dim light<\/strong> reduces incoming sensory input, giving the brain a break to regulate.<\/pee>\n<div class=\"tool-box\">\n<div class=\"tool-box-label\">&#x1F9EA; DYNSEO Tool<\/div>\n<div class=\"tool-box-title\">Emotion Thermometer<\/div>\n<pee>Learning to identify and gauge the intensity of one&#8217;s internal states \u2014 including the state of overload \u2014 is a fundamental regulation skill. DYNSEO&#8217;s Emotion Thermometer helps children and adults develop this awareness of their emotional and sensory states, the first step towards better self-regulation.<\/pee>\n  <a href=\"https:\/\/www.dynseo.com\/en\/our-tools\/emotion-thermometer\/\" class=\"btn-tool\">Discover the tool &#x2192;<\/a>\n<\/div>\n<h2 id=\"enfants\">8. Supporting a child in sensory overload<\/h2>\n<pee>For parents and teachers, supporting a child in sensory overload first requires understanding that what they observe is not a chosen behavior \u2014 it is a nervous system calling for help. This perspective radically changes the approach: one does not punish an overload, one helps it to self-regulate.<\/pee>\n<pee>Identifying the <strong>specific triggers<\/strong> for the child is a key step. For some, it is the noise of playgrounds. For others, the textures of certain foods, the lights in the cafeteria, the crowd. This specific sensory profile \u2014 what overwhelms and what soothes \u2014 is different for each child and deserves to be observed, documented, and shared with the entire educational and family team.<\/pee>\n<pee>The <a href=\"https:\/\/www.dynseo.com\/mon-dico-une-application-pour-favoriser-la-communication\/\" style=\"color:var(--bleu);font-weight:600;border-bottom:1px solid rgba(94,94,215,.3);\">MY DICTIONARY<\/a> app from DYNSEO can be a valuable tool for children who struggle to verbalize their overload \u2014 particularly in autism or for non-verbal children \u2014 by providing visual supports to communicate their state and needs.<\/pee>\n<h2 id=\"adultes\">9. Managing sensory overload in adulthood<\/h2>\n<pee>Many adults live with high sensory sensitivity without ever identifying it \u2014 attributing their midday fatigue, their need for silence after work, or their difficulty in crowded spaces to introversion or lack of energy. Identifying the sensory component of these difficulties allows for much more targeted and effective management strategies.<\/pee>\n<pee>Adults who manage their sensory sensitivity well generally share two practices: they <strong>plan their &#8220;sensory energy budgets&#8221;<\/strong> \u2014 knowing that a meeting in an open space followed by a crowded restaurant will exhaust them, they plan recovery time accordingly. And they <strong>adapt their environments<\/strong> \u2014 office with acoustic partitions, noise-canceling headphones, adjustable lighting \u2014 without shame and without needing to justify it.<\/pee>\n<h2 id=\"professionnels\">10. For professionals: tools and approaches<\/h2>\n<pee>Professionals who support individuals with sensory sensitivity \u2014 occupational therapists, psychomotor therapists, speech therapists, special education teachers \u2014 have several validated assessment and intervention frameworks. Sensory Integration, developed by occupational therapist Jean Ayres in the 1970s, is the most established approach for assessing and treating sensory processing difficulties in children.<\/pee>\n<div class=\"cta-box\">\n<h3>&#x1F50A; Support sensory needs with DYNSEO tools<\/h3>\n<pee>Our practical tools \u2014 sensory needs map, emotion thermometer, calm-down strategies \u2014 are designed to support professionals and families in assisting individuals with high sensory sensitivity.<\/pee>\n<div class=\"cta-buttons\">\n    <a href=\"https:\/\/www.dynseo.com\/en\/our-tools\/emotion-thermometer\/\" class=\"btn-cta-white\">&#x1F321;&#xFE0F; Emotion Thermometer<\/a><br \/>\n    <a href=\"https:\/\/www.dynseo.com\/en\/our-tools\/\" class=\"btn-cta-outline\">All tools &#x2192;<\/a>\n  <\/div>\n<\/div>\n<p><a href=\"https:\/\/www.dynseo.com\/en\/our-training-courses\/\" class=\"internal-link\"><\/p>\n<div class=\"internal-link-icon\">&#x1F393;<\/div>\n<div class=\"internal-link-content\">\n<div class=\"internal-link-label\">DYNSEO Training<\/div>\n<div class=\"internal-link-title\">Training on Autism Spectrum Disorders and Sensory Sensitivity<\/div>\n<div class=\"internal-link-desc\">Understand autistic sensory processing in depth to adapt your professional practices \u2014 Qualiopi certified training.<\/div>\n<\/p><\/div>\n<div class=\"internal-link-arrow\">&#x2192;<\/div>\n<p><\/a><\/p>\n<div class=\"article-tags\">\n  <a href=\"#\" class=\"article-tag\">sensory overload<\/a><br \/>\n  <a href=\"#\" class=\"article-tag\">sensory hypersensitivity<\/a><br \/>\n  <a href=\"#\" class=\"article-tag\">autism sensory processing<\/a><br \/>\n  <a href=\"#\" class=\"article-tag\">autistic meltdown<\/a><br \/>\n  <a href=\"#\" class=\"article-tag\">ADHD sensitivity<\/a><br \/>\n  <a href=\"#\" class=\"article-tag\">HSP hypersensitive<\/a><br \/>\n  <a href=\"#\" class=\"article-tag\">sensory regulation<\/a><br \/>\n  <a href=\"#\" class=\"article-tag\">DYNSEO autism tools<\/a>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<p>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":4,"featured_media":150367,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"[et_pb_section fb_built=\"1\" admin_label=\"Article HTML\" _builder_version=\"4.16\" custom_padding=\"0px||0px||false|false\" global_colors_info=\"{}\"][et_pb_row admin_label=\"Contenu\" _builder_version=\"4.16\" width=\"100%\" max_width=\"100%\" custom_padding=\"0px||0px||false|false\" global_colors_info=\"{}\"][et_pb_column type=\"4_4\" _builder_version=\"4.16\" global_colors_info=\"{}\"][et_pb_code admin_label=\"HTML import\u00e9\" _builder_version=\"4.16\" global_colors_info=\"{}\"]<style type=\"text\/css\">\n:root{\n  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{transform:rotate(90deg) translateX(4px);}\n.dbi-art-2bc313 .toc {padding:22px 20px;}\n}\n\n<\/style>\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"Article\",\n  \"headline\":\"Surcharge Sensorielle : Qu'est-ce que c'est et Comment Aider un Cerveau Submerg\u00e9\",\n  \"description\":\"Surcharge sensorielle : m\u00e9canismes, signes, profils concern\u00e9s et strat\u00e9gies concr\u00e8tes pour aider un cerveau submerg\u00e9. Guide complet pour familles et professionnels.\",\n  \"author\":{\"@type\":\"Organization\",\"name\":\"DYNSEO\",\"url\":\"https:\/\/www.dynseo.com\"},\n  \"publisher\":{\"@type\":\"Organization\",\"name\":\"DYNSEO\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/www.dynseo.com\/wp-content\/uploads\/2021\/03\/logo-dynseo.png\"}},\n  \"datePublished\":\"2026-03-28\",\n  \"dateModified\":\"2026-03-28\"\n}\n<\/script>\n<div class=\"dbi-art-2bc313\">\n<header class=\"article-hero\">\n  <div class=\"article-hero-inner\">\n    <nav class=\"article-breadcrumb\">\n      <a href=\"https:\/\/www.dynseo.com\/\">Home<\/a> &rsaquo;\n      <a href=\"https:\/\/www.dynseo.com\/nos-outils\/\">Tools &amp; resources<\/a> &rsaquo;\n      Sensory overload\n    <\/nav>\n    <span class=\"article-category\">&#x1F50A; SENSORY &amp; COGNITION<\/span>\n    <h1>Sensory Overload&nbsp;: what is it and how to <span class=\"hl\">help an overwhelmed brain<\/span><\/h1>\n    <div class=\"article-meta\">\n      <span>&#x1F4C5; March 2026<\/span>\n      <span>&#x23F1; 18 min read<\/span>\n      <span>&#x1F3EB; By the DYNSEO team<\/span>\n    <\/div>\n  <\/div>\n  <div class=\"article-hero-curve\"><\/div>\n<\/header>\n\n<div class=\"container\">\n<article class=\"article-body\">\n\n<div class=\"toc\">\n  <h4>&#x1F4D1; Summary<\/h4>\n  <ol>\n    <li><a href=\"#definition\">What is sensory overload?<\/a><\/li>\n    <li><a href=\"#filtrage\">How the brain filters sensory information<\/a><\/li>\n    <li><a href=\"#signes\">The signs of sensory overload<\/a><\/li>\n    <li><a href=\"#profils\">The most affected profiles<\/a><\/li>\n    <li><a href=\"#meltdown\">Autistic meltdown: understanding and distinguishing<\/a><\/li>\n    <li><a href=\"#environnement\">Adapting the environment to prevent overload<\/a><\/li>\n    <li><a href=\"#strategies\">Calming down strategies<\/a><\/li>\n    <li><a href=\"#enfants\">Supporting a child in sensory overload<\/a><\/li>\n    <li><a href=\"#adultes\">Managing sensory overload in adulthood<\/a><\/li>\n    <li><a href=\"#professionnels\">For professionals: tools and approaches<\/a><\/li>\n  <\/ol>\n<\/div>\n\n<p>A classroom with 28 students all talking at the same time. A shopping mall on Saturday afternoon with its noises, lights, and food smells. A birthday party with balloons popping, loud music, and children running around. For most people, these environments are simply lively \u2014 perhaps tiring. For some brains, they are literally unbearable.<\/p>\n\n<p><strong>Sensory overload<\/strong> \u2014 also called sensory hypersensitivity or sensory cognitive overload \u2014 occurs when the brain receives more sensory information than it can process effectively. The nervous system, overwhelmed, triggers an intense stress response that can range from simple discomfort to a panic attack or meltdown. This phenomenon is particularly common among autistic people, ADHD, highly sensitive people (HSP), and anxious individuals \u2014 but it can affect anyone under sufficiently intense conditions.<\/p>\n\n<p>Understanding sensory overload \u2014 its mechanisms, signs, triggers, and strategies to help \u2014 is a fundamental skill for anyone supporting neurodivergent individuals: parents, teachers, healthcare professionals, but also for the individuals concerned themselves.<\/p>\n<div class=\"key-points\">\n  <h3>&#x2728; What you will learn in this article<\/h3>\n  <ul>\n    <li>The neurological mechanisms of sensory filtering<\/li>\n    <li>The behavioral, cognitive, and emotional signs of overload<\/li>\n    <li>The most affected neurological profiles (autism, ADHD, HSP)<\/li>\n    <li>The difference between meltdown, shutdown, and anxiety attack<\/li>\n    <li>Concrete strategies for adaptation and calming down<\/li>\n    <li>Tools to support children and adults<\/li>\n  <\/ul>\n<\/div>\n\n<h2 id=\"definition\">1. What is sensory overload?<\/h2>\n\n<p>Sensory overload occurs when the intensity or quantity of sensory stimuli \u2014 visual, auditory, tactile, olfactory, proprioceptive \u2014 exceeds the processing and filtering capacity of the nervous system. The brain, unable to process, prioritize, and inhibit all the information that arrives simultaneously, shifts into a state of over-activation that triggers stress and avoidance responses.<\/p>\n\n<p>It is important to understand that sensory overload is not an excessive or irrational reaction. For the brain experiencing it, the stimuli are not \"too strong in absolute terms\" \u2014 they are <strong>too strong for that specific brain<\/strong>, because its sensory processing threshold is different. It is not a matter of emotional sensitivity or lack of will \u2014 it is a real neurological difference in how the nervous system processes and filters sensory information.<\/p>\n<div class=\"info-box\">\n  <p><strong>&#x1F4CA; The prevalence of sensory hypersensitivity.<\/strong> Significant sensory processing difficulties affect between 5% and 16% of the general population according to studies, with a much higher prevalence in certain neurodevelopmental profiles: about 70-90% of autistic people, 40-60% of people with ADHD, and by definition 100% of \"Highly Sensitive Persons\" (HSP). Sensory overload is therefore not a rare phenomenon \u2014 it concerns a significant proportion of the population, often unidentified.<\/p>\n<\/div>\n\n<h2 id=\"filtrage\">2. How the brain filters sensory information<\/h2>\n\n<h3>The reticular formation: the main filter<\/h3>\n\n<p>The human brain continuously receives a colossal flow of sensory information \u2014 estimated at about 11 million bits per second for visual and auditory channels alone. Yet, consciousness processes only a tiny fraction \u2014 about 40 to 50 bits per second. This radical filtering is ensured by several neurological mechanisms, including the <strong>ascending reticular activating formation<\/strong> (ARAF) in the brainstem, which acts as a first-level filter by selecting information that is salient enough to deserve conscious attention.<\/p>\n\n<h3>The thalamus: sensory dispatcher<\/h3>\n\n<p>The <strong>thalamus<\/strong> is the next step in filtering \u2014 it receives almost all sensory information and distributes it to the appropriate cortical regions. In some individuals, the thalamus filters information less effectively \u2014 more background sensory noise reaches the cortex, which then has to work harder to process relevant information. This less effective \"thalamic gating\" is one of the proposed mechanisms to explain sensory hypersensitivity in autism.<\/p>\n\n<h3>The prefrontal cortex: attention regulator<\/h3>\n\n<p>The prefrontal cortex plays a key role in the top-down regulation of sensory processing \u2014 it can amplify or inhibit the processing of certain information based on ongoing goals. When the resources of the prefrontal cortex are depleted \u2014 due to fatigue, stress, or high cognitive load \u2014 this top-down regulation becomes less effective, and sensory information \"leaks\" more. This is why sensory overload is more frequent at the end of the day, in stressful situations, or after intense cognitive effort.<\/p>\n\n<h2 id=\"signes\">3. Signs of sensory overload<\/h2>\n\n<div class=\"sign-grid\">\n  <div class=\"sign-card\">\n    <div class=\"sign-card-title\">&#x1F6B6; Behavioral signs<\/div>\n    <ul>\n      <li>Seeking to isolate oneself or escape the environment<\/li>\n      <li>Covering ears, eyes, or mouth<\/li>\n      <li>Intensified self-regulation behaviors (rocking, flapping)<\/li>\n      <li>Irritability, seemingly unexplained aggression<\/li>\n      <li>Refusal to enter certain places<\/li>\n    <\/ul>\n  <\/div>\n  <div class=\"sign-card\">\n    <div class=\"sign-card-title\">&#x1F9E0; Cognitive signs<\/div>\n    <ul>\n      <li>Difficulty concentrating or responding to questions<\/li>\n      <li>Confusion, disorientation, slowing of thought<\/li>\n      <li>Inability to make even simple decisions<\/li>\n      <li>Forgetting words or usual procedures<\/li>\n      <li>Feeling \"cloudy\"<\/li>\n    <\/ul>\n  <\/div>\n  <div class=\"sign-card\">\n    <div class=\"sign-card-title\">&#x1F62C; Emotional signs<\/div>\n    <ul>\n      <li>Sudden and intense anxiety<\/li>\n      <li>Tears or crying spells for no apparent reason<\/li>\n      <li>Feeling overwhelmed, overpowered<\/li>\n      <li>Restlessness, inability to stay still<\/li>\n      <li>Feeling a sense of panic or urgency to \"get out\"<\/li>\n    <\/ul>\n  <\/div>\n  <div class=\"sign-card\">\n<div class=\"sign-card-title\">&#x1F4AA; Physical signs<\/div>\n    <ul>\n      <li>Headaches or migraines<\/li>\n      <li>Nausea or digestive disorders<\/li>\n      <li>Sudden and intense fatigue<\/li>\n      <li>Muscle tension, jaw clenching<\/li>\n      <li>Palpitations, hot flashes<\/li>\n    <\/ul>\n  <\/div>\n<\/div>\n\n<p>These signs can appear in isolation or in combination, and their intensity varies according to the person's profile and the level of overload. An important point: <strong>the signs may not be visible from the outside<\/strong>. Many people, especially adults and children who engage in \"masking,\" internalize the overload \u2014 hiding it until the breaking point, making it difficult for those around them to detect.<\/p>\n\n<h2 id=\"profils\">4. The most affected profiles<\/h2>\n\n<h3>Autism Spectrum Disorder (ASD)<\/h3>\n\n<p>Atypical sensory sensitivity is now part of the diagnostic criteria for ASD in the DSM-5. It can take two forms: hypersensitivity (excessive reaction to stimuli) and hyposensitivity (insufficient reaction, needing intense stimuli to perceive them). Many autistic individuals present a mix of both, with different profiles depending on the sensory channels \u2014 hypersensitive to sounds but hyposensitive to textures, for example.<\/p>\n\n<div class=\"tool-box\">\n  <div class=\"tool-box-label\">&#x1F9EA; DYNSEO Tool<\/div>\n<div class=\"tool-box-title\">Sensory Needs Map ASD<\/div>\n  <p>The Sensory Needs Map ASD from DYNSEO helps identify and visualize the sensory profile of an autistic child \u2014 which channels are over-reactive, which are under-reactive \u2014 to adapt the environment and activities to their specific needs.<\/p>\n  <a href=\"https:\/\/www.dynseo.com\/nos-outils\/carte-des-besoins-sensoriels-tsa\/\" class=\"btn-tool\">Discover the tool &#x2192;<\/a>\n<\/div>\n\n<h3>ADHD<\/h3>\n\n<p>Difficulties in inhibition and attentional filtering in ADHD make the brain more vulnerable to sensory overload. Without effective filtering of irrelevant stimuli, more information reaches consciousness \u2014 which can quickly exceed processing resources and generate overload. Sensory overload in ADHD is often fluctuating \u2014 well-managed in certain states (high motivation, low cognitive load), unbearable in others (fatigue, stress, rich environment).<\/p>\n\n<h3>Highly Sensitive People (HSP)<\/h3>\n\n<p>The concept of \"Highly Sensitive Person\" (HSP), introduced by Elaine Aron in the 1990s, describes individuals whose nervous system is constitutionally more reactive to stimuli \u2014 both internal and external. HSPs are not neurotypical \"with more sensitivity\" \u2014 their difference in sensory and emotional processing is structural. Sensory overload is a common experience for HSPs, particularly in environments rich in social stimuli.<\/p>\n\n<h3>Anxiety and Chronic Stress<\/h3>\n\n<p>Anxiety lowers the threshold for sensory processing \u2014 an anxious brain perceives stimuli as more intense and threatening. Chronic stress, through prolonged cortisol secretion, gradually degrades prefrontal sensory filtering. This vicious circle (overload \u2192 anxiety \u2192 increased overload) is important to understand in order to support anxious individuals in stimulating environments.<\/p>\n\n<h2 id=\"meltdown\">5. Autistic Meltdown: Understanding and Distinguishing<\/h2>\n\n<p>In the context of autism, sensory overload can lead to what is called a <strong>meltdown<\/strong> \u2014 an intense, often dramatic crisis that occurs when the nervous system has reached its breaking point. The meltdown is not a tantrum, manipulation, or whim \u2014 it is the neurological consequence of an overloaded nervous system that has exhausted all its regulatory resources.<\/p>\n\n<p>It is important to distinguish the meltdown from the <strong>shutdown<\/strong> \u2014 another possible response to overload, where the person shuts down, withdraws, no longer responds, and seems \"absent.\" Both are survival responses of the nervous system to overload \u2014 one by explosion (the meltdown), the other by collapse (the shutdown). Neither is voluntarily controllable in the moment.<\/p>\n\n<div class=\"alerte-box\">\n  <div class=\"alerte-box-title\">&#x26A0;&#xFE0F; What to do \u2014 and not do \u2014 during a meltdown<\/div>\n  <p><strong>Do:<\/strong> Immediately reduce stimuli (lights, sounds, number of people), remain calm and non-verbal, offer a safe and predictable space, do not touch without permission, wait for the crisis to unfold safely.<\/p>\n  <p style=\"margin-top:8px;\"><strong>Do not do:<\/strong> Try to reason or explain during the crisis (the prefrontal cortex is inaccessible), punish, touch without consent, increase stimuli to \"calm\" (speak loudly, turn on screens), force to \"pull oneself together.\"<\/p>\n<\/div>\n\n<a href=\"https:\/\/www.dynseo.com\/nos-outils\/strategies-retour-au-calme\/\" class=\"internal-link\">\n  <div class=\"internal-link-icon\">&#x1F9D8;<\/div>\n  <div class=\"internal-link-content\">\n    <div class=\"internal-link-label\">DYNSEO Tool<\/div>\n    <div class=\"internal-link-title\">12 Strategies for Calming Down<\/div>\n<div class=\"internal-link-desc\">12 validated techniques to help the nervous system regulate after sensory overload \u2014 suitable for children and adults.<\/div>\n  <\/div>\n  <div class=\"internal-link-arrow\">&#x2192;<\/div>\n<\/a>\n\n<h2 id=\"environnement\">6. Arrange the environment to prevent overload<\/h2>\n\n<p>The best intervention against sensory overload is <strong>prevention<\/strong> \u2014 arranging environments to reduce problematic stimuli before they reach the overload threshold.<\/p>\n\n<ul class=\"numbered-list\">\n  <li><strong>Reduce unnecessary sound sources:<\/strong> Noise-canceling headphones or earplugs in noisy environments, reduce background noise (TV, background music), prefer floor coverings and textiles that absorb sound rather than reflective surfaces.<\/li>\n  <li><strong>Optimize lighting:<\/strong> Replace flickering fluorescent lights with stable LED lighting, use blackout curtains to regulate brightness, offer sunglasses for very bright environments, prefer indirect lighting.<\/li>\n  <li><strong>Provide decompression spaces:<\/strong> A quiet corner accessible at any time \u2014 at home, in class, at work \u2014 where the person can retreat to regulate. This space should have reduced stimuli (little noise, little light, few people) and calming sensory objects if desired.<\/li>\n  <li><strong>Structure transitions:<\/strong> Unpredictability amplifies overload. Anticipate upcoming changes, use visual schedules, give warnings before transitions \u2014 these practices reduce anticipatory anxiety that lowers the sensory tolerance threshold.<\/li>\n  <li><strong>Plan regular sensory breaks:<\/strong> Before reaching overload, regular breaks in a calm environment allow the nervous system to \"discharge\" the accumulation of stimuli. These breaks are particularly important during long days in rich environments (school, open space work).<\/li>\n<\/ul>\n\n<h2 id=\"strategies\">7. Strategies for calming down<\/h2>\n\n<p>When sensory overload is already present, several strategies can help the nervous system regulate. The common point of these strategies is that they <strong>activate the parasympathetic nervous system<\/strong> \u2014 the \"rest and recovery\" system \u2014 in response to the activation of the sympathetic system of overload.<\/p>\n\n<p><strong>Slow abdominal breathing<\/strong> is one of the most accessible and well-validated techniques: exhaling longer than inhaling (for example: inhale for 4 counts, exhale for 6-8 counts) directly activates the vagus nerve and the parasympathetic system. <strong>Proprioceptive pressure<\/strong> \u2014 a heavy blanket, arm compression, a firm consensual hug \u2014 has documented calming effects, likely via the deep pressure receptors in the skin. <strong>Immersion in silence and dim light<\/strong> reduces incoming sensory input, giving the brain a break to regulate.<\/p>\n\n<div class=\"tool-box\">\n  <div class=\"tool-box-label\">&#x1F9EA; DYNSEO Tool<\/div>\n<div class=\"tool-box-title\">Emotion Thermometer<\/div>\n  <p>Learning to identify and gauge the intensity of one's internal states \u2014 including the state of overload \u2014 is a fundamental regulation skill. DYNSEO's Emotion Thermometer helps children and adults develop this awareness of their emotional and sensory states, the first step towards better self-regulation.<\/p>\n  <a href=\"https:\/\/www.dynseo.com\/nos-outils\/thermometre-des-emotions\/\" class=\"btn-tool\">Discover the tool &#x2192;<\/a>\n<\/div>\n\n<h2 id=\"enfants\">8. Supporting a child in sensory overload<\/h2>\n\n<p>For parents and teachers, supporting a child in sensory overload first requires understanding that what they observe is not a chosen behavior \u2014 it is a nervous system calling for help. This perspective radically changes the approach: one does not punish an overload, one helps it to self-regulate.<\/p>\n\n<p>Identifying the <strong>specific triggers<\/strong> for the child is a key step. For some, it is the noise of playgrounds. For others, the textures of certain foods, the lights in the cafeteria, the crowd. This specific sensory profile \u2014 what overwhelms and what soothes \u2014 is different for each child and deserves to be observed, documented, and shared with the entire educational and family team.<\/p>\n\n<p>The <a href=\"https:\/\/www.dynseo.com\/mon-dico-une-application-pour-favoriser-la-communication\/\" style=\"color:var(--bleu);font-weight:600;border-bottom:1px solid rgba(94,94,215,.3);\">MY DICTIONARY<\/a> app from DYNSEO can be a valuable tool for children who struggle to verbalize their overload \u2014 particularly in autism or for non-verbal children \u2014 by providing visual supports to communicate their state and needs.<\/p>\n\n<h2 id=\"adultes\">9. Managing sensory overload in adulthood<\/h2>\n\n<p>Many adults live with high sensory sensitivity without ever identifying it \u2014 attributing their midday fatigue, their need for silence after work, or their difficulty in crowded spaces to introversion or lack of energy. Identifying the sensory component of these difficulties allows for much more targeted and effective management strategies.<\/p>\n\n<p>Adults who manage their sensory sensitivity well generally share two practices: they <strong>plan their \"sensory energy budgets\"<\/strong> \u2014 knowing that a meeting in an open space followed by a crowded restaurant will exhaust them, they plan recovery time accordingly. And they <strong>adapt their environments<\/strong> \u2014 office with acoustic partitions, noise-canceling headphones, adjustable lighting \u2014 without shame and without needing to justify it.<\/p>\n\n<h2 id=\"professionnels\">10. For professionals: tools and approaches<\/h2>\n\n<p>Professionals who support individuals with sensory sensitivity \u2014 occupational therapists, psychomotor therapists, speech therapists, special education teachers \u2014 have several validated assessment and intervention frameworks. Sensory Integration, developed by occupational therapist Jean Ayres in the 1970s, is the most established approach for assessing and treating sensory processing difficulties in children.<\/p>\n\n<div class=\"cta-box\">\n  <h3>&#x1F50A; Support sensory needs with DYNSEO tools<\/h3>\n  <p>Our practical tools \u2014 sensory needs map, emotion thermometer, calm-down strategies \u2014 are designed to support professionals and families in assisting individuals with high sensory sensitivity.<\/p>\n  <div class=\"cta-buttons\">\n    <a href=\"https:\/\/www.dynseo.com\/nos-outils\/thermometre-des-emotions\/\" class=\"btn-cta-white\">&#x1F321;&#xFE0F; Emotion Thermometer<\/a>\n    <a href=\"https:\/\/www.dynseo.com\/nos-outils\/\" class=\"btn-cta-outline\">All tools &#x2192;<\/a>\n  <\/div>\n<\/div>\n\n<a href=\"https:\/\/www.dynseo.com\/nos-formations\/\" class=\"internal-link\">\n  <div class=\"internal-link-icon\">&#x1F393;<\/div>\n  <div class=\"internal-link-content\">\n    <div class=\"internal-link-label\">DYNSEO Training<\/div>\n    <div class=\"internal-link-title\">Training on Autism Spectrum Disorders and Sensory Sensitivity<\/div>\n<div class=\"internal-link-desc\">Understand autistic sensory processing in depth to adapt your professional practices \u2014 Qualiopi certified training.<\/div>\n  <\/div>\n  <div class=\"internal-link-arrow\">&#x2192;<\/div>\n<\/a>\n\n<div class=\"article-tags\">\n  <a href=\"#\" class=\"article-tag\">sensory overload<\/a>\n  <a href=\"#\" class=\"article-tag\">sensory hypersensitivity<\/a>\n  <a href=\"#\" class=\"article-tag\">autism sensory processing<\/a>\n  <a href=\"#\" class=\"article-tag\">autistic meltdown<\/a>\n  <a href=\"#\" class=\"article-tag\">ADHD sensitivity<\/a>\n  <a href=\"#\" class=\"article-tag\">HSP hypersensitive<\/a>\n  <a href=\"#\" class=\"article-tag\">sensory regulation<\/a>\n  <a href=\"#\" class=\"article-tag\">DYNSEO autism tools<\/a>\n<\/div>\n\n<\/article>\n<\/div>\n\n\n<\/div>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section]","_et_gb_content_width":"","footnotes":""},"categories":[2915],"tags":[],"class_list":["post-533828","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-conseils-des-coachs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sensory Overload: What It Is and How to Help an Overwhelmed Brain - DYNSEO - Educational apps &amp; 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