Motion and Speed

Question 1

motion and speed (MT)

Answer 1

• region of the cortex where cells have a particular preference

Question 2

damage to MT

Answer 2

leads to akinetopsia (loss of motion) (without knowledge of motion)

Question 3

What pathway

Answer 3

• ventral stream
• temporal lobe (FFA) (LOC and IT)

Question 4

where pathway

Answer 4

• dorsal stream
• parietal lobe (VIP, 7a)

Question 5

Blindsight (Weiskrantz)

Answer 5

Cortical blindness (damage in both hemispheres)
- Sit blind participants in front of screen showing them dots of lights (dots were moving left, right, & center)
- Whenever a light was presented a sound was made
- Was eye tracking where the participants were looking
- Blind patients were able to see the first two degrees because they are bypassing the V1 cortex (due to the 10% going to parietal cortex)

Question 6

Empirical Evidence for Two Streams (double dissociations)

Answer 6

• Trained monkeys on 2 tasks: Landmark Task and Object task
• Monkeys learned that food is either under triangle or rectangle
• ** need to recognize the difference between triangle and rectangle

Question 7

Lesions parietal cortex in one group of monkey

Answer 7

Impaired on landmark task
Good on object discrimination task

Question 8

Lesioned temporal cortex in another group of monkeys

Answer 8

Imparied on object discrimination task
Good on Landmark

Question 9

How to decode what Temporal Cortex orientation prefers:

Answer 9

Present many pictures while recording from a single cell
Simplify the stimulus as much as possible
(ex: like the hand → show hand with fingers, hand with no fingers, face, fork → to see what activates the temporal)