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Visual System Function: Central Vision Processing Flashcards

(19 cards)

0
Q

LGN Layers 3-6

A

Parvocellular

*Contains axons of P-type RGCs, have small fields, and respond w/ sustained firing

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1
Q

LGN Layers 1,2

A

Magnocellular

*Contain axon from M-type RGCs, have large receptor fields, and respond to stimulation w/ transient spiking

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2
Q

Layer IVCa

A

Receives axons from Layers 1,2 of LGN; have oval shaped receptor fields that are orientation selective

=>projects to Layer IVB

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3
Q

Layer IVCb

A

Receives axons from LGN Layers 3-6
Cells are binocular; are orientation AND direction sensitive

*Allows for the analysis of motion

=>projects to Layer III

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4
Q

Layer III (Primary Visual Cortex)

A

Receives axons from intralaminar neurons in LGN

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5
Q

P-IB (Parvocellular interblob channel)

A

Allows for detection of shape via orientation of receptive fields

  • Are found in b/w the blobs of Layer III
  • Are binocular & insensitive to wavelength
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6
Q

Blob Channel

A

Allows for analysis of color via wavelength sensitive, monocular cells

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7
Q

Dorsal Stream of Extrastriate Visual Cortex

A

Layer IVB M-channel neurons project to…

  1. Area MT- shows directional tuning and responds to movement
  2. Area MST- Responds to complex motions (Rotation, linear motion)
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8
Q

Ventral Stream of Extrastriate Visual Cortex

A

Blob and interblob neurons of Layer IVC project thru…

  1. Area V4- Large receptive fields that contribute to color analysis and perception
  2. IT Areas- Respond to colors and highly specific shapes
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9
Q

Achromatopsia

A

Lesion in V4 that results in partial/complete loss of color vision

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10
Q

Prospagnosia

A

Lesion in IT areas where pts. are unable to identify the faces of people

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11
Q

Fusiform gyrus

A

Contains the major face recognition area

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12
Q

Strabismus in children

A

Leads to suppressed input from weak eye; results in abnormal development of the visual cortex

*Treat by patching the eye/surgically repairing it

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13
Q

Retinal disparity

A

Mechanism for near-field perception

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14
Q

Far-field depth perception

A

Depth cues are

Size
Interposition
Linear perspective
Light and shadow
Motion parallax
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15
Q

LGN blood supply

A

Anterior choroidal artery

16
Q

Second Major Visual Pathway

A

RGCs project to the superior colliculus

=>Pulvinar

=>Finally, extrastriate visual areas

17
Q

Lesion in Area 18

A

Visual agnosia

18
Q

Simple Cells

A

Found in Layer IVCa; oval shaped “on” and “off” areas

*Orientation selective