10: VISUAL STREAMS

Question 1

2 VISUAL STREAMS

Answer 1

1. DORSAL STREAM
2. VENTRAL STREAM

Question 2

visual stream that = system of interconnected regions of visual cortex involved in perception of SPATIAL LOCATION

Answer 2

DORSAL STREAM

Question 3

STRIATE CORTEX → POSTERIOR PARIETAL CORTEX

Answer 3

PATHWAY OF DORSAL STREAM

Question 4

WHERE STREAM: provides visual info that guides navigation/mvmts directed toward objects

Answer 4

DORSAL STREAM FUNCTION

Question 5

visual stream that = system of interconnected regions of VISUAL CORTEX involved in perception of FORM

Answer 5

VENTRAL STREAM

Question 6

STRIATE CORTEX → INFERIOR TEMPORAL CORTEX

Answer 6

PATHWAY OF VENTRAL STREAM

Question 7

WHAT STREAM: provides visual info abt size/shape/colour/texture of objects

Answer 7

VENTRAL STREAM FUNCTION

Question 8

theory that:
DORSAL STREAM = vision-for-ACTION
VENTRAL STREAM = vision-for-perception

Answer 8

PERCEPTION VS ACTION MODEL (GOODALE + MILNER)

Question 9

blindness in RIGHT EYE

Answer 9

RIGHT EYE BLINDNESS

Question 10

blindness in both TEMPORAL (OUTER) visual fields

Answer 10

BITEMPORAL BLINDNESS

Question 11

blindness in both LEFT visual fields

Answer 11

LVF HEMIANOPIA

Question 12

blind spot/partial loss of vision

Answer 12

SCOTOMA

Question 13

entire QUADRANT of visual field = blind

Answer 13

QUADRANTOPOA

Question 14

entire SIDE of visual field = blind

Answer 14

HEMIANOPIA

Question 15

ability of person who CANNOT see objects in their blind field to ACCURATELY IDENTIFY facial expressions of emotion while remaining UNCONSCIOUS of perceiving them

Answer 15

BLINDSIGHT

Question 16

BLINDSIGHT = caused by damage to ___

Answer 16

VISUAL CORTEX

Question 17

• synchronizing bhvr cycles of day/night
• coordinating eye mvmts
  -directing attn
• reaching/grasping

Answer 17

OTHER UNCONSCIOUS VISUAL PROCESSES

Question 18

deficits in visual perception in ABSENCE of blindness caused by damage to parts of EXTRASTRIATE CORTEX that contribute to VENTRAL STREAM

Answer 18

VISUAL AGNOSIA

Question 19

2 TYPES OF AGNOSIA

Answer 19

1. APPERCEPTIVE AGNOSIA
2. ASSOCIATIVE AGNOSIA

Question 20

agnosia/impairment in MATCHING/COPYING

Answer 20

APPERCEPTIVE AGNOSIA

Question 21

agnosia/impairment in ASSOCIATING image w NAME (but matching/copying = preserved)

Answer 21

ASSOCIATIVE AGNOSIA

Question 22

agnosia of face recognition assoc w damage to INFERIOR aspect of OCCIPITOTEMPORAL CORTEX in region of FUSIFORM GYRUS

Answer 22

PROSOPAGNOSIA

Question 23

• damaged VENTRAL STREAM = VISUAL FORM AGNOSIA
• intact DORSAL STREAM = intact visuomotor CONTROL

Answer 23

PATIENT DF

Question 24

agnosia in which you CANT identify object SHAPE

Answer 24

VISUAL FORM AGNOSIA

Question 25

inability to POINT/GRASP targets under VISUAL GUIDANCE

Answer 25

OPTIC ATAXIA

Question 26

damage to ____ STREAM = VISUAL FORM AGNOSIA damage to ____ STREAM = OPTIC ATAXIA

Answer 26

VENTRAL; DORSAL

Question 27

- damaged DORSAL STREAM = OPTIC ATAXIA - can close eyes + touch nose but CANT reach out to touch object

Answer 27

PATIENT RV

Question 28

Which VIS STREAM processes info abt objects SIZE to calibrate GRIP APERTURE (how wide to open hand to grip an object)?

Answer 28

DORSAL STREAM

Question 29

presentation of 2 shapes + asking if shapes = same/diff

Answer 29

PERCEPTUAL DISCRIMINATION TASK

Question 30

PATIENT DF/PATIENT RV'S RESULTS OF PERCEPTUAL DISCRIMINATION TASK

Answer 30

DF: CANT tell whether shapes =same/diff (CANT do perception) RV: CAN tell whether shapes = same/diff (CAN do perception)

Question 31

patients grasp object/shape where grasp line runs directly thru CENTRE of object

Answer 31

GRASP TASK

Question 32

PATIENT DF/PATIENT RV'S RESULTS OF GRASP TASK

Answer 32

DF: CAN grasp object w STABLE grasp bc DORSAL STREAM INTACT RV: CANT grasp object w STABLE grasp bc DORSAL STREAM = DAMAGED

Question 33

OBJECT STRUCTURE PROCESSING: object recognition SPATIAL LOCATION PROCESSING: spatial location

Answer 33

OBJECT STRUCTURE/SPATIAL FUNCTIONS OF VENTRAL STREAM

Question 34

OBJECT STRUCTURE PROCESSING: grasp aperture/stability SPATIAL LOCATION PROCESSING: reach location

Answer 34

OBJECT STRUCTURE/SPATIAL FUNCTIONS OF DORSAL STREAM