Quiz 5 Vocab Study

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bipolar cells

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21 Terms

1

bipolar cells

  • type of neuron in the retina that receives input directly from receptors

  • located closer to the center of the eye

  • sends messages to ganglion cells even closer to the eye

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2

blind spots

  • the area at the back of the retina where the optic nerve exists

  • devoid of receptors

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3

cones

  • type of retinal receptor that contributes to color perception

  • most abundant in and around the fovea (6 million per retina)

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4

fovea

  • a tiny area of the retina specialized for acute, detailed vision

  • packed tightly with receptors

  • nearly free of ganglion axons and blood vessels

  • vision is dominated by what we see here

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5

ganglion cells

  • type of neuron in the retina that receives input from the bipolar cells

  • their axons form the optic nerve

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6

optic nerve

  • the cranial nerve that serves the retina

  • ganglion cell axons that exit through the back of the eye and continue to the brain

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7

pupil

  • the contractile aperture in the center of the iris of the eye; resembles a large black dot

  • light enters the eye through an opening in the center of the iris

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8

retina

  • the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve

  • the rear surface of the eye, which is lined with visual receptors

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9

rods

  • type of retinal receptor that detects brightness of light

  • most abundant in the periphery of the eye and responds to faint light (120 million per retina)

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10

astigmatism

  • impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people

  • a decreased responsiveness to one kind of line or another, caused by the asymmetric curvature of the eyes

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11

blindsight

  • the ability to respond in limited ways to visual information without perceiving it consciously

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12

complex cells

  • type of visual cortex cell located in areas V1 and V2 that responds to a pattern of light in a particular orientation anywhere within its large receptive fields

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13

horizontal cells

  • type of cell that receives input from receptors and delivers inhibitory input to bipolar cells

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14

primary visual cortex

  • aka area V1

  • area of the cortex responsible for the first stage of visual processing

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15

receptive field

  • in each cell the specific region of sensory space in which an appropriate stimulus can drive an electrical response in a sensory neuron

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16

retinal disparity

  • the discrepancy between what the left and right eyes see

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17

dorsal stream

  • pathway through the parietal cortex is the action pathway or the "how" pathway, because of its importance for visually guided movements

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18

fusiform gyrus

  • brain area of the inferior temporal cortex that recognizes faces

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19

motion blindness

  • an impaired ability to perceive movement

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20

saccades

  • voluntary eye movements

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21

visual agnosia

  • inability to recognize or interpret objects in the visual field despite otherwise satisfactory vision

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