Lecture 8
Terms
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- First place of convergence for each eye
- V1
- Not until synapse in __ that inputs from two eyes are together
- V1
- Neuron turned on by both eyes now:
- binoculuar vision
- Number does not equal __
- flow
- Sensory Pathway:
- sensory receptor --> thalamic nucleus --> primary cortex --> secondary cortex --> teritary/ multi modality association cortex
- Sensory receptors:
- M and P cells
- Thalamic nucleus:
- LGN: magno and parvo pathway
- Primary Cortex:
- v1
- Secondary cortex:
- modality specific
- Teritary/multi modality cortex:
- higher visual processing, combine input from mult visual regions to consider visual percept
- MT:
- Area middle temporal
- MST:
- middle superior temporal
- TEO/PIT:
- posterior inferior temporal cortex
- TE/AIT:
- anterior inferior temporal cortex
- As move up the hierarchy of visual processing the receptive fields become more __ and they fire to their __ stimulus
- selective, designated
- Sensitive to faces:
- TE anterior inferior temporal cortex
- sensative to color
- V4
- simple cells in V1 calculate __
- edges
- Info from many simple cells feed into one complex cell in __, __, __ etc to from edges, corners, etc
- v1, v2, v3
- Info from many complex cells feed into __ order visual regions to form shapes or faces
- higher
- Color and motion visual stimuli are __ specific
- attribute
- Motion area:
- MT/V5
- Color:
- V4
- Cortical color blindness:
- achromatomatopsia
- motion blindness:
- akinetopsia
- achromatopsia and akinetopsia are: __ specific
- attribute
- Zeki and colleagues found that movement detection was more __ and that what/where to __/__ were segregated early in the __ stream
- dorsal, temporal/parietal, ventral
- Cortical achromatopsia has damage to the occipital __ region in __
- temporal V4
- Cortical achromatopsia is damage to the __ pathway
- what
- Akinetopsia lesion along the __ __/__
- dorsal v5/MT
- Akinetopsia is damage to the __ pathway
- where
- 5 implications of attribute specific deficts:
-
1. magno and parvo cellular pathways give rise to higher level attribute perception
2. atribute deficits reveal unique fxns performed by areas
3. special purpose modules perform operations in parallel
4. modality specific
5. modules provide input to upstream computations - What did the Zeki PET scan study try and do?
- Show that there were distinct color and motion activated brain regions
- What were the experimental and control groups of the Zeki PET scan study?
-
Color: control: gray rectangles
experiment: color rectangles
motion: control: not moving (black)
experiment: moving (black) - What did the Zeki PET scan study find?
-
Motion: V5/MT
Color: V4