Dual streams - Neurological

Question 1

Who (and when) first proposed the dual stream hypothesis?

Answer 1

Goodale and Milner, 1992

Question 2

What 4 main areas are involved in the dorsal stream?

Answer 2

V3
V5
Superior Parietal Lobule
Posterior Parietal Cortex

Question 3

Give the 4 main differences between the ventral and dorsal stream proposed by Goodale and Milner ?

Answer 3

Ventral = vision for perception, dorsal = vision for action.

Ventral = allocentric, perceive related to surrounding cues, dorsal = egocentric, perceived related to self

Ventral = conscious visual experience, dorsal = uncosncious, less aware

Ventral = sustained representation - picture, dorsal = transient representations

Question 4

What 3 main areas are involved in the ventral stream?

Answer 4

V4
Inferior Temporal cortex
Temporal-Occipital Area

Question 5

Which patient (Milner et al, 1991) suffered from visual agnosia?

A DV
B RV
C DF
D HM

Answer 5

C DF

Question 6

Patient DF sruggled with object ________ and _______, and _________ matching. However his ________ ________actions such as _______ were intact.

Answer 6

DF - deficits in object naming and recognition, as well as orientation matching, however, had intact visually guided actions and grasping

Question 7

Patient RV suffered from

A Optic Apraxia
B Oculomotor Ataxia
C Oculomotor apraxia
D Optic Ataxia

Answer 7

D Optic Ataxia

Question 8

Optic ataxia patients struggle with _______ ______ _______ such as in the _______ task, but are able to _______ and _____ objects

Answer 8

Optic ataxia - deficits in visually guided actions such posting task, however fine at name and recognise objects

Question 9

Recent neurological evidence has shown that visual systems (________ and __________) are not entirely _______________ but more ____________

Answer 9

Ventral and dorsal streams not fully dissociated but more integrated

Question 10

Upon closer review of DF’s (visual agnosia) actions, what was found by Himmelbach et al 2020?

Answer 10

Found that DF’S visually guided actions were below average. As DF had a damaged ventral stream area, suggests visually guided actions not fully dissociated from vision for perception.

Question 11

Jackson et al 2018 propose that Optic Ataxia is not just a deficit in __________ _________ actions but a deficit in comparing _________ _________ references

Answer 11

Jackson et al 2018 hypothesis - optic ataxia not purely visually guided action defciti put a failure to compare multiple spatial reference points.

Question 12

Explain Gibson (1979) ecological view of action-perception? (3 points)

Answer 12

Impossible to uncouple action from perception
Percieve objects with relevance to how we act on them
perception not passive but with affordance - possibility of action afforded by environment