Movement

Question 1

V5 (or MT) does what?

Answer 1

V5 or MT for medial temporal mediates perception of movement

Question 2

the V5 receives input from…

Answer 2

Primary visual cortex, other areas of visual association cortex, and superior colliculus

Question 3

Why does input arrive faster to V5 than to V4?

Answer 3

Because they are more heavily myelinated

Question 4

V5 neurons responded best to

Answer 4

movement and many are sensitive to movement in a particular direction

Question 5

What is adjacent to V5 and receives input from V5?

Answer 5

V5a or MST (medial superior temporal) adjacent to V5 receives input from V5 and is sensitive to complex movements i.e. circular, radial, spiral

Question 6

What does the medial superior temporal analyze, or what is it also important for?

Answer 6

MST is important in analysis of optic flow; i.e., analysis of the relative movements of visual elements in the environment;

• e.g. when walking, some objects move to the R, L up or down in your visual field
• analysis of optic flow allows you to determine what direction you are going, how fast you are approaching objects and if they will pass on the R, L, above or below

Question 7

Functional imaging locates

Answer 7

MT/MST inferior temporal sulcus

Question 8

Case reports of bilateral damage in humans results in

Answer 8

Impaired perception of movement

Question 9

Disruption of V5 with transcranial magnetic stimulation impairs

Answer 9

Perception of movement without affecting perception of form; when stimulation was terminated s/s could perceive movement

Question 10

Patterns of movement can also give rise to:

Answer 10

Perception of 3D form; these abilities can be dissociated in brain injury in humans

Question 11

V5 damage can have impaired

Answer 11

perception of movement without impairment of form perception based on movement

Question 12

Medial occipital damage

Answer 12

Can have accurate perception of movement but impaired perception of form based on movement

Question 13

Studies identify a what at the junction of temporal and parietal lobes?

Answer 13

Visual association area that mediate discriminating between objects that are really moving vs. those whose images are moving on the retina because of head, eye, or body movements.

Question 14

Case report of patient with bilateral occipital damage…

Answer 14

When he moved his head, it appeared the “world was moving in the same direction.”