Lecture 13 - motion perception and decision making

Question 1

Describe the dorsal pathway.

Answer 1

occipitoparietal or ‘where’ pathway
focused with spatial perception and vision for action
ends in the inferior temporal parietal cortex

Question 2

Describe the ventral pathway.

Answer 2

occipitotemporal or ‘what pathway’
concerned with object perception and recognition
ends in the inferior temporal cortex

Question 3

What is critical for recognising object shape both in vision and touch?

Answer 3

LOC - lateral occipital cortex

Question 4

What is the P pathway responsible for?

Answer 4

colour processing
seeing objects with low contrast
higher spatial resolution

Question 5

What is the M pathway responsible for?

Answer 5

monochrome processing
seeing objects with high contrast
lower spatial resolution

Question 6

What brain areas are involved in recognition?

Answer 6

Fusiform face area
Parahippocampal place area

Question 7

What is the FFA involved in?

Answer 7

face recognition
damage in this area can lead to inability to recognise faces

Question 8

What is the PPA involved in?

Answer 8

place recognition
damage in this area can lead to inability to recognise a scene but not the items in a scene

Question 9

Name 5 neurological disorders to do with damage/problems to the FFA, PPA and word form areas (agnosia).

Answer 9

1. apperceptive agnosia - can’t perceive objects
2. integrative agnosia - failure to integrate parts of an object
3. associative agnosia - inability to access conceptual knowledge about an object
4. prosopagnosia - inability to recognise faces
5. phonagnosia - inability to recognise familiar voices

Question 10

Dyslexia studies - noise-induced afterimage dominance.

Answer 10

• subjects look at highly contrasted images
• close their eyes to see the afterimage
• put hands over their eyes to dim the afterimage
• removing one hand and then the other showed a difference in brightness of the reinstated image
• 19/30 saw a brighter image with right eye
• 11/30 saw a brighter image with left eye

Question 11

When tested on dyslexia what were the results from the noise-induced afterimage dominance?

Answer 11

• 16/30 gave identical results for the 2 methods
• 14/30 said the afterimage test gave an undetermined dominance

Question 12

What did Maxwell’s findings conclude?

Answer 12

for dyslexic people their 2 eyes are equivalent and the brain has to rely on 2 slightly different versions of a scene.
this induces poor and unstable fixation.