Visual gnosis refer to the ability to perceive an object through our vision, to represent it and to grasp its meaning.
What are visual gnosis?
Visual gnosis are simply a term that defines the ability to recognize objects through vision.
What you need to know is that there are 2 main visual cerebral pathways:
- The “WHAT” pathway, specialized in the visual identification of objects. It extracts the visual information from the stimuli and processes it in order to recognize them and attribute a meaning to them.
- The “WHERE” channel which allows us to localize objects in space.
When there is a brain lesion in one of these two pathways, it can cause problems that affect either the recognition of objects or the location of objects. When there is a disorder in one of the two pathways, it is called visual agnosia.
Visual gnosis disorders
When there is a disorder of visual gnosis, it is called visual agnosia. Visual agnosias are defined as the inability to recognize people or objects when presented visually. In order to conclude that there is visual agnosia, recognition in other modalities must be preserved. For example, in the tactile modality, i.e. by touching the object, or in the auditory modality, by hearing the noise it makes.
There are two types of visual agnosia:
- Associative visual agnosia, which is the inability to recognize what one perceives correctly; the perception is correct but devoid of meaning. For example, one can copy a drawing, but one does not recognize what one is copying.
- Perceptual visual agnosia, which is the inability to recognize because of perceptual deficits, what one sees is meaningless. For example, one is unable to copy a drawing.
Exercises to train and improve your visual gnosis
To improve your visual gnosis, try to observe your surroundings. Look for all possible details in an object, a person or a place. Focus on shapes, sizes and colors.
You can also reflect on the distance between objects or their positions in space. Then try to remember what you saw, without having the model in front of you. Do you remember all the details?
You can also do the opposite exercise. Think of an object you have at home, try to create a mental image of that object. Then take the object in question and see if there are any differences from what you just imagined.
Our games to work on visual gnosis