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Chapter-06 Agnosia

BOOK TITLE: Higher Neural Functions: A Clinical Approach

Author
1. Madhusudanan M
2. Kumar A Anand
3. Babu Arun N
ISBN
9789386056269
DOI
10.5005/jp/books/14147_7
Edition
1/e
Publishing Year
2018
Pages
37
Author Affiliations
1. Pushpagiri Medical College, Thiruvalla, Kerala, India, Pushpagiri Institute of Medical Sciences Thiruvalla, Kerala, India, Pushpagiri Institute of Medical Sciences, Tiruvalla, Kerala, India, Travancore Medicity Medical College, Kollam, Kerala, India; Manipal University, India; Trivandrum Medical College, Kerala, India; Kottayam Medical College, Kerala, India
2. Amrita Institute of Medical Sciences, Kochi, Kerala, India
3. Mercy Hospital, Buffalo, New York, United States, Mercy Hospital, Buffalo, New York, United States; State University of New York, Downstate Medical Center, Brooklyn, New York, USA
Chapter keywords
Agnosia, visual agnosia, color agnosia, simultanagnosia, topographagnosia, auditory agnosia, tactile agnosia, attentional deficits

Abstract

The term agnosia refers to a condition in which there is normal perception of external stimuli, but one is unable to associate these stimuli with prior knowledge of its meaning or significance. Agnosia represents a lack or loss of knowledge. It is usually a modality specific recognition impairment that cannot be explained by simple problems in elementary sensory processing, global cognitive or attentional deficits, inability to name due to aphasia, or difficulty interpreting the testing stimuli used to assess recognition abilities. This chapter covers the visual agnosia-general, specific types of visual agnosia, color agnosia, simultanagnosia, topographagnosia, auditory agnosia, tactile agnosia, tests for agnosia, and treatment of agnosia.

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