Unit 3: Vision and Eye Movements Flashcards Preview

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Flashcards in Unit 3: Vision and Eye Movements Deck (32):
1

L1: "Off"-center ganglion cells are ______ when light is shined in the center of their receptive fields.

inhibited

2

L1: "On"-center ganglion cells are ______ when light is shined in the center of their receptive fields.

excited

3

L1: At the optic chiasm, the _____ half of the axons decussate.

Medial

4

L1: Bipolar cells always supply _____ input to ganglion cells

excitatory

5

L1: Color information is processed in the ____ of hypercolumns in the cortex.

Blobs

6

L1: Damage to the MLF results in _______, in which there is loss of coordination between contralateral medial and lateral recti.

Internuclear Ophthalmoplegia (INO)

7

L1: In the LGN layers _____ comprise the magnocellular system.

1/2/2015

8

L1: In the LGN layers _____ comprise the parvocellular system.

3, 4, 5, 6

9

L1: INO can be distinguished from other neural problems or medial recti problems if _____ is intact.

vergence

10

L1: Photoreceptors are ____-polarized when they receive light.

hyper

11

L1: Saccades are driven _____-laterally

contra-

12

L1: What type of cell? Cells found at the border of ocular dominance columns

Binocular

13

L1: What type of cell? Maps a receptive field shape corresponding to a narrow line with specific orientation.

Simple

14

L1: What type of cell? Mediates depth perception, receives input from both eyes

Binocular

15

L1: What type of cell? Receptive fields that abstract for position such that a line/edge can be identified anywhere in the visual field

Complex

16

L1: What type of cell? Useful for seeing movement in the visual field

Complex

17

L2: _____ frontal eye field activates the _____ abducens nucleus resulting in a left saccade.

Right; left

18

L2: _____ frontal eye field activates the _____ abducens nucleus resulting in a right saccade.

Left; right

19

L2: _____: rhythmic pattern of saccades and tracking movements that occurs when watching objects go by in a car, for example

optokinetic nystagmus

20

L2: Ganglion cells synapse at the ______, which sends optic radiations to the visual cortex.

LGN

21

L2: Horizontal cells are ______ by neurotransmitter release from photoreceptors, such that shining light on the receptive field _____ horizontal cells.

excited; inhibits

22

L2: Horizontal cells project to nearby photoreceptors to supply _____ input.

inhibitory

23

L2: In the LGN, layers _____ receive input from the contralateral eye

1/4/2006

24

L2: In the LGN, layers _____ receive input from the ipsilateral eye

2/3/2005

25

L2: Lesion in the ______ decreases the accuracy of saccades

Superior colliculus

26

L2: Lesion in the ______ generates temporary loss of ability to make saccades.

Frontal Eye Field

27

L2: The Frontal Eye Field activates saccades via ______ or _______.

reticular formation, superior colliculus (to reticular formation)

28

L2: The magnocellular system invovles ____ receptive fields and ____ acuity.

large; low

29

L2: The parvocellular system involves ____ receptive fields and ____ acuity.

small; high

30

L2: What is the pattern generator for saccades?

Paramedian pontine reticular formation (PPRF)

31

L2: Which system in the LGN responds to color?

parvocellular

32

L2: Which system in the LGN responds to emotion?

magnocellular