Deficit in Visual Perception: Agnosia

15 important questions on Deficit in Visual Perception: Agnosia

What happens when there's a lesion of temporal lobes?

Object disctrimination is impaired

What is object discrimination?

Selecting items with a particular shape (Select round foodwell)
- Impaired by lesion of temoral lobe

What is landmark discrimination?

Selecting objects using position (foodwell closest to tower)
- Impaired by lesion of parietal lobes
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What is the argument of grip for vision for action?

Theres already a grip aperture prior to picking up objects

What is optic ataxia / Optic apraxia?

Dorsal lesion: Seeing shapes but not being able to pick them up. (Action not intact, perception still intact)

What does the SLOT task show?

Being able to post (enter it), but not to match (from a distance), shows theres a difference between vision for action and vision for perception.

What is perceptual organisation? What is it used for?

Automatically combining distant elements into a coherent 'whole', objects and backgrounds
- Yellow Rounds belong together

Can be used to
make sense of visual information, even when there's limited input

What is the Gollin Picture Task?

Minimal line input and have to 'see' the whole. (Car lines are deleted in some places)

What tasks are done badly by patiënt with Apperceptive Agnosia?

- Unusual (non accidental) view task
- Shadow Task
- Copying Task
- Degraded Letter Task
- Gollin picture Task

How does someone with Intergrative Agnosia copy?

Follows the lines, not the objects (2 squares, 1 round is normally how we copy)

What is the difference between Apperceptive & Integrative Agnosia VS. Associative agnosia?

Apperceptive & Intergrative: Problems with perceptual organization --> Binding features into coherent concept

Associative Agnosia: Problem of coupling visual percept to semantic and other knowledge

Where are Face Selective cells found?

IT: Inferotemporal Cortex
in the Fusiform Face Area (FFA)
More prominent in right hemisphere

What is the same/different in Human & Monkey brain area's?

Two face area's each
Monkey region has face selective cells

Human brain more lateralized
Human responses more invariant

What are arguments for faces being special?

- Pareidolia
- Face selective Neurons
- FFA & other face areas
- N170 ERP when faces are processed
- Prosopagnosia

What are arguments against faces being special?

- Expertise: FFA also active in bird experts when seeing birds

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