PSYC 256 Lecture Notes - Lecture 7: Parietal Lobe, Agnosia, Prosopagnosia

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13 Jun 2018
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DISRUPTIONS OF PERCEPTION
Agnosia: no ability to know what you are seeing
-Visual Agnosia
Impairment in ability to interpret visual information
NOT a sensory deficit; patients can still see
-Apperceptive Agnosia
Very limited visual recognition of objects
o Cannot match objects by sight alone (can’t tell which two objects are the
same)
o Can use other modalities to identify objects (can use touch, smell, etc.)
Posterior right parietal lobe
-Associative Agnosia
Have normal visual representations, but cannot use that information to recognize
things
o Can match objects in front of them
o Can often draw from memory
o Cannot readily name objects they see
Bilateral temporal/occipital junction
o More dorsal
Can draw an object (what they have in mind) but when taken away and presented
again to them, they won’t recognize what they drew
-Apperceptive vs. Associative
-Prosopagnosia
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