seminar 7 - claudia racca

Question 1

cells in the secondary and tertiary visual cortex receive input from…

Answer 1

V1

Question 2

what are the 2 pathways from V1

Answer 2

dorsal or ventral pathway

Question 3

which pathway is at the top and which at the bottom

Answer 3

dorsal at the top
ventral at the bottom

Question 4

dorsal stream

Answer 4

‘where’
- spatial awareness
- visually guided behaviour

Question 5

ventral stream

Answer 5

‘what’
- recognition and discrimination of visual shapes and objects
- perception and recognition of faces

Question 6

dorsal pathway goes to…

Answer 6

V5

Question 7

ventral pathway goes to

Answer 7

V4

Question 8

in V5/MT (medial temporal in temporal lobe) most cells are…

Answer 8

direction selective
respond more to the motion of objects than their shape

Question 9

beyond area MT there is MST (medial superior temporal in parietal lobe) where the cells are important for…

Answer 9

navigation
directing eye movements
motion perception

Question 10

hemineglect

Answer 10

patient is unable to focus their attention onto objects on the left side
hemineglect typically results from damage to the right parietal lobe

Question 11

balint’s syndrome

Answer 11

the parietal lobes are damaged on both sides of the brain resulting in the loss of the dorsal stream to direct attention

Question 12

what is simaltagnosia

Answer 12

a symptom of balint’s syndrome
the inability to recognise multiple objects presented simultaneously (one on top of the other)

Question 13

MT lesion: akinetopsia

Answer 13

profound motion blindness and struggle in performing the activities of daily living
(e.g cross the stress - can see cars but not how they are moving)

Question 14

area V4 receives input from V1 blob and interblob regions

Answer 14

area important for shape and colour perception

Question 15

achromatopsia

Answer 15

clinical syndrome in humans caused by damage to area V4 - partial or complete loss of colour vision

Question 15

area IT (inferior temporal lobe)

Answer 15

major output of V4
receptive fields respond to a wide variety of colours and abstract shapes

Question 15

neurons in IT are selective for complex patterns e.g

Answer 15

faces

Question 16

visual agnosia

Answer 16

can copy drawing but not able to name what they are drawing
cant recognise or name objects

Question 17

prosopagnosia

Answer 17

inability to recognise faces
they see the faces but cant put a name to the face
caused by lesion in the right inferior temporal lobe