Read about agnosia medical facts: what is the definition of agnosia, what are the signs and symptoms, medical treatment & how to treat agnosia, information about the causes, diagnosis, and related agnosia diseases.

Definition: What is "Agnosia"?


Agnosia or failure to know is a condition in which the person is unable to recognize objects, persons, sounds, shapes, or smells without any defective in a specific sense. There are different types of agnosia. The Autotopagnosia, the person is unable to identify the parts of the body. Visual agnosia the person cannot recognize a visual objects. Another type is Alexia, Inability to recognize text. We also have color agnosia, the patient has difficulty in distinguishing between color perception versus color recognition. Prosopagnosia also called as faceblindness or facial agnosia , the affected person is unable to recognize faniliar faces. Expressive agnosia is a type o g agnosia that the person cannot perceive different facial perception. Visual Verbal agnosia, the patient cannot understand spoken words. Auditory agnosia. The person can hear but unable to determine environmental & non-verbal auditory signs. Amusia, unable to identify music. Somatosensory agnosia or Astereognosia the patient is unable to identify object that is touch. Time Agnosia another type of agnosia that characterized with loss of comprehension of the time & duration of events. Apraxia or motor (body) agnosia it involves loss of ability to determine physical actions thus lead to repetitive of action.

Symptoms & Signs

Patient with Agnosia will show abnormal physical & mental function depending on the type of agnosia & the injury of the brain.

Treatment: How to Treat "Agnosia"?

There is no specific treatment of agnosia, but rehabilitation like occupational therapy & speech therapy can help & improve the patient, but depending on the cause of the disorder.


Agnosia is cause from strokes, dementia, or other neurological problem. Head injury, brain infection & genetic are also the predisposing factors that leads agnosia.


Thorough physical assessment can identify agnosia. MRI & CT scan can also help diagnose the disorder & the severity of injury.

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