EXAM 1 REVIEW

Question 1

Verrey

Answer 1

Right hemiachromatopsia
- normal color vision in LVF
- color perceived as grey in RVF
Shape perception preserved

Question 2

Conclusions of Verrey’s study

Answer 2

Cortical color center located outside of primary visual cortex
- lingual and fusiform gyri

Question 3

Strengths of Verrey’s study

Answer 3

Patient had complete loss of color vision in hemifield
-reasonably good testing of form perception
- excellent info about lesion location

Question 4

What are associated visual symptoms of cerebral achromatopsia?

Answer 4

Scotoma and almost all cases
And often:
Prosopagnosia
reading impairment

Question 5

cerebral achromatopsia results from damage to and provides evidence for:

Answer 5

A cortical region specialized for color perception
- located in lingual fusiform gyrus

Question 6

Localization of cortical color area?

Answer 6

Lesion deficit correlation
functional neuroimaging

Question 7

Zeki et al.

Answer 7

compared brain activation for colored and monchrome stimuli to find brain areas that respond to color

As well as motion

Question 8

Color afterimages

Answer 8

Staring at one color gives you an after image of the complimentary colors

Question 9

What do color afterimages show us?

Answer 9

Tells us that there are opponent-receptive color fields

Question 10

How do you know if a single mechanism for how things work is plausible?

Answer 10

If the deficits consistently occur together
some reason to suppose that the impaired functions might be performed by the same mechanism

Question 11

how to know if different mechanisms for functions are plausible?

Answer 11

deficits sometimes dissociate
no obvious reason to think impaired functions would be performed by a single mechanism

Question 12

What are the problems with the single mechanism interpretation for achromatopsia and scotoma?

Answer 12

Dissociations btw achromatopsia and scotomas
when present, scotomas are virtually never limited to the lower visual view

Question 13

What are the problems with the single mechanism interpretation for achromatopsia and Prosopagnosia?

Answer 13

Dissociation between the two
Bouvier and Engel: normal face recognition in 11/46 achromatopsia cases

Question 14

Correspondence problem

Answer 14

Match scenes where something changes from one scene to another

Question 15

Aperture proble

Answer 15

Direction of motion within receptive fields (small window) can be misleading

Question 16

Basics of motion perception

Answer 16

Detection of motion (distinguishing moving stationary stimuli)
perceiving the direction of motion

Question 17

LM’s detection of motion:

Answer 17

No impression of motion when cube moved toward or away from LM

Despite clear impression of changes in size and position

Question 18

Moving vs stationary for LM

Answer 18

Stationary: Lm was substantially slower than the control but could detect the target

Moving:
Much slower than the control to detect movement and often inaccurate in perceiving movement direction

Question 19

When could LM Never detect direction of motion

Answer 19

In the periphery

Question 20

Does LM Experience motion aftereffects?

Answer 20

No

Question 21

Lm’s motion perception:

Answer 21

Impaired detection of motion
impaired perception of motion direction
impaired perception of speed
absence of motion aftereffects

Question 22

When could LM Perceive motion?

Answer 22

When it was not associated with vision