Agnosia in Brief: Summary on Agnosia

Agnosia: summary

Scroll down the page to read the summary table on agnosia.

Agnosia Disturbance of perception of a sensory discriminatory nature, of a tactile, visual and / or acoustic type: the subject is unable to recognize and identify a given object, perfume, shape, person or entity Agnosia: etymology of the term The term agnosia derives from the Greek a-gnosis, which literally means do not know Agnosia: causes Agnosia is directly related to brain injury Apperceptive agnosia Impairment of the patient's perceptual function:

Transformational agnosia
Agnosia by form
Integrative agnosia

Associative agnosia The patient is unable to associate a meaning to a given object, therefore this is not recognized: impossibility of recognizing the object, of remembering its name and correct use Visual agnosia Inability to recognize some objects, despite the visual abilities not being damaged or impaired:

Prosopoagnosia
Topographical agnosia
Agnosia for colors

Auditory or acoustic agnosias Impossibility of recognizing sounds and noises of varying intensity Tactile agnosia (stereoagnosie) Inability to recognize an object through touch:

Amorphognosy
Tactile asymbolism
Ailognosia

Visuospatial agnosia Obvious problems in perfectly processing spatial information Digital agnosia Inability to identify, distinguish or name one's hands One-sided spatial neglect The subject is unable to identify a part of the space that surrounds him Agnosia: diagnosis Goals:

To recall a visual and / or verbal stimulus to the patient, subsequently evaluating the possible correspondence between the two stimuli
Differential diagnosis with related pathologies (e.g. anomia)

Diagnostic strategies:

Bottom-up (or periphery-to-center test)
Riddoch and Humphreys hippograph test
Test of figures with missing parts
Verbal tests (top down, or from the center to the periphery)
Test for describing the shape of a given object or image
Evocation test of the gesture through which an object is used
Object colorage test

Agnosia and rehabilitation treatment Precautions:

Remind the patient where he is at that moment
Remind the agnostic for what purpose a given object or tool is used;
Pay particular attention to some parts of the body not recognized by the patient
Subject the patient to a series of practical rehabilitation exercises, useful for the recognition of the object under examination

Agnosia: prognosis The complete recovery of the agnostic patient is rather unlikely: nevertheless, the symptoms can be alleviated through targeted rehabilitation