Wed 2 - Fitz - Sensory perception

Question 1

examples that was given where a “ba” sound is changes to a “va” sound

Answer 1

McGurk effect

Question 2

example of a centrifugal connection (descending input)

Answer 2

a connection that provides positive feedback

modulation of outer hair cells

Question 3

on-center vs off center gangion cells

Answer 3

On-center GCs produce more action potentials when stimulated by a bright light in the center of their receptive field, and inhibited by stimuli delivered to the surround.

Off-center GCs are stimulated by surround stimuli, and inhibited by center stimuli.

Question 4

main point of lateral inhibition

Answer 4

increase contrast

Question 5

strabismus

what is it
two types

Answer 5

muscle imbalance that results in misalignment of the visual axes of the two eyes.

diplopia - occurs if muscle imbalance starts after 6mo. perceve single object as double

if diplopia persists: Amblyopia - decrease in visual acuity in the weaker eye because the brain stops using it

Question 6

strabismus

what is it
two types

Answer 6

muscle imbalance that results in misalignment of the visual axes of the two eyes.

diplopia - occurs if muscle imbalance starts after 6mo. perceve single object as double

if diplopia persists: Amblyopia - decrease in visual acuity in the weaker eye.

Question 7

information related to form and color

originates from these cells
travels along what path in the brain
lesions cause what

Answer 7

p cells

travels along the ventral stream (goes towards the temporal cortex)

associated with “what”

lesions case Achromatopsia, a distict type of color blindness or inability to recognize objects.

Question 8

info regarding motion and depth perception

originates form these cells
travels along what path in the brain
lesions cause what

Answer 8

m cells

dorsal stream (to the parietal cortex)

associated with “where”

lesions cause ideomotor apraxia, where the person can’t execute movements that require aligning a movement with an image