Agnosia

Agnosia ( from Ancient Greek α -a-, " un-, not " and γνώσις gnosis, " knowledge" ) is a term that is used in medicine and in philosophy with different meanings. In philosophy it means " ignorance ". This article is about the agnosia as a medical issue.

The agnosia is a relatively rare neuropsychological symptom that occurs after bilateral or unilateral ( sub) cortical lesions. It is defined as a disorder of cognition without elementary sensory deficits, cognitive failures, attention disorders, aphasic Benennstörungen or ignorance of the stimulus to be detected is present. The agnosia is usually modality, the parties may be able possibly to compensate for the impaired perception channel ( modality ) through an unimpaired.

Origin of the term agnosia

The term agnosia comes from Sigmund Freud (1891 ) and originally referred only to the visual system. Freud summarized including any failure in which patients were unable, despite at least partially existing vision to name things. According to Freud, thus falls under both the cortical blindness, which blindness soul and the optical aphasia. Nowadays, the term is extended to all modalities conceived and the affected modality usually specified in more detail.

Types of agnosia

• Visual agnosia ( General physiology of perception and its disturbances on the example of vision, mental blindness ), special forms, for example: Prosopagnosia ( " face blindness " )
• Alexie
• Bewegungsagnosie ( Akinetopsie )
• Associative agnosia
• Apperceptive agnosia
• Formagnosie

• Amusia