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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