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Cognition > Perception (Chap 2, 3 & 4) > Flashcards

Perception (Chap 2, 3 & 4) Flashcards

1
Q

What is perception?

A

The acquisiton and processing of sensory information in order to see, hear, taste or feel objects in the world

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2
Q

Size of visual cortex?

A

20 % of entire cortex

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3
Q

Three major consequences of light hitting the retina?

A

Reception, transduction, coding

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4
Q

Reception

A

Absorption of physical energy by photoreceptors

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5
Q

Transduction

A

Physical energy converted into electro-chemical pattern

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6
Q

Coding

A

One to one correspondence between physical stimulus and nervous system activity

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7
Q

The order in which light passes in the eye

A

Cornea, iris (determined by pupil), lens, retina

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8
Q

Describe accommodation when light is from a distant object

A

Lens is pulled out thin

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9
Q

Accommodation on a close object

A

Lens is bulged or convex

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10
Q

how many cones

A

6 million

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11
Q

Where are the most cones?

A

fovea

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12
Q

How many rods

A

125 million

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13
Q

Cones

A

colour and sharp vision

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14
Q

Rods

A

Dim light and movement detection

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15
Q

Main pathway from eye to visual cortex

A

retina-geniculate-striate pathway

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16
Q

How does the retina-geniculate-striate pathway transmit information?

A

From the retina to V1 to V2 (via geniculate in thalamus)

17
Q

Two channels of RGS pathway

A

Parvocellular and magnocellular

18
Q

Parvocellular pathway

A

Sensitive to colour and fine detail; cone input mostly

19
Q

Magnocellular pathway

A

Sensitive to information about movement (rods mostly)

20
Q

Are the two pathways completely separate?

A

no

21
Q

What are the three physiological dimensions of colour?

A

hue, saturation and lightness

22
Q

Opponents Process Theory

A

Opponent-process theory suggests that color perception is controlled by the activity of three opponent systems.

Cognition (10 decks)

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