Agnosia

Agnosia

Agnosia is a special type of perception disorder in which a person cannot recognize the properties of objects that are in his field of vision. The essence of this phenomenon is that a person cannot perceive the physical properties and characteristics of objects as real images that exist outside of his consciousness. Examples include visual agnosia or auditory agnosia. Agnosia can also be understood as tactile, gustatory, and olfactory agnosia. This deviation can be either congenital or acquired if a person is deprived of the opportunity to interact with environmental objects.

Types of agnosia When classifying this affect, several groups of perception disorders are distinguished: - color - observed with damage to the occipital lobes of the brain; - gustatory – is the result of damage to the frontal areas; - auditory – affect the temporal region; - olfactory – responsible for disruption of the parietal lobe; - asymmetrical brain lesions - the patient cannot see objects that are located on his left or right; - spatial – occurs when the cerebellum or its trunk is damaged; - motor (motor) – characterized by impaired coordination of movements. - proprioception – the inability to feel objects and perceive their position in space.

Color disorder If we talk about color agnosia, then there are no problems with primary colors - red, green, blue. But the patient cannot distinguish shades of the color spectrum. Some colors are simply not perceived by humans. Slight inaccuracies in color perception may indicate the initial stage of such a disorder. For example, he may mistake pink for white. At the same time, a person recognizes colors in black and white compositions.

Auditory perception The disorder manifests itself in the inability to hear sounds. In some cases, a person hears only speech. We are talking about a patient with auditory agnosia. The patient has no hearing impairment, otherwise he is completely healthy. However, he can hear all sounds, but not fully perceive them. This affects the quality of speech, as well as the patient’s ability to distinguish objects by sounds. Visual perception The main symptoms will be associated with the sensation of blindness, although the person usually retains residual vision. Peripheral vision images undergo changes due to complete or partial disruption of fields in the form of spots in which there is no ability to distinguish objects.