what is the purpose of vision

Question 1

who proposed the 2 visual systems hypothesis

Answer 1

milner and goodale 1995 and 2006

Question 2

the 2 visual systems hypothesis

Answer 2

vision for perception

vision for action

Question 3

what is vision for perception

Answer 3

to develop internal mental representation of our environment
colour, size, shape

Question 4

what is vision for action

Answer 4

to prepare us for interacting with out environment

able to engage with the real world

Question 5

patient df

Answer 5

demonstrated visual agnosia
they could not match a card to put it in the slot
they could not estimate the length of a block with thumb and forefinger
but, when asked to pick up a block, their thumb and finger were the correct distance for picking it up
so when asked to use internal mental representation they couldn’t do it but when doing visually guided action, they could
could do vision for action but not perception

Question 6

what is visual agnosia

Answer 6

inability to identify objects on the basis of shape

can see but cannot recognise or interpret visual information

Question 7

functions of visual cortex

Answer 7

zeki 1992

Question 8

zeki 1992

Answer 8

functions of visual cortex

Question 9

what are the names of the functions of visual cortex

Answer 9

v1
v2
v3
v4
v5/m

Question 10

what is v1 and v2

Answer 10

primary and secondary visual cortex
earliest processing
cells responsive to colour and form

Question 11

what is v3

Answer 11

cells respond to form

Question 12

what is v4

Answer 12

cells responsive to colour and line orientation

Question 13

what is v5/m

Answer 13

visual motion

Question 14

patient LM

Answer 14

akinetopsia 
lesions on part of visual cortex
unable to perceive motion 
greatly difficult to cross roads
pouring fluids seem frozen
damage in v5/m

Question 15

what is akinetopsia

Answer 15

patient cannot perceive motion

Question 16

what are the 2 visual streams

Answer 16

ventral stream

dorsal stream

Question 17

ventral stream

Answer 17

what stream 
object processing 
occipital-temporal-frontal
colour 
texture
pictorial detail
shape
size

Question 18

dorsal stream

Answer 18

where stream
spatial processing 
location
movement 
spatial transformations
spatial relations

Question 19

what is a visual illusion

Answer 19

our brain trying to make sense of something and sometimes misapplying some of the cues we use to make sense of the world.
Or
because when we look at it, we use vision for perception system when in the real world we use vision for action as interacting with things

Question 20

haart, carey and milne 1999

Answer 20

vision for perception and action

Question 21

vision for perception and action

Answer 21

haart, carey and milne 1999

Question 22

vision for perception and action

study

Answer 22

condition 1-participants indicated length of line using thumb and index finger - vision for perception RESULTS showed strong illusion effect supporting vision for perception
condition 2-participants rapidly grasped target figure using thumb and index finger -vision for action RESULTS showed no illusion effect supporting vision for action