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9 - Vision in the brain (cont'd again; 9.15.25)
Morgan Paladino
Created on September 12, 2025
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Vision in the brain
9.15.25
(cont'd, AGAIN)
Agenda
- Exit Ticket Recap
- Areas of extrastriate cortex
- What & where/how pathways
Announcements
- A couple of days behind on syllabus
- adjust reading accordingly
- Project groups- contact Emma if assistance still needed
- Emma will be organizing review session approx. 1 week prior to Exam 1 (Fri 10/3)
today's slido
bistable perception figure
What animal do you see above? (No wrong answers)
Areas of extrastriate cortex
V2 neurons
respond to color, contour, and borders
V2
V4 neurons
respond to curvature, orientation, and location (which together comprise shape)
V4
Area MT (V5) neurons
respond to motion in their receptive field (in a particular direction)
"He went that-a-way!"
"He went that-a-way!"
MT
Object recognition areas
respond to objects of distinct shape
recognition of generic objects is supported by the
- lateral occipital cortex (LOC)
- inferotemporal cortex (ITC)
The lateral occipital cortex (LOC) responds to meaningful objects (i.e. left side, not right)
Face & Place recognition areas
- fusiform face area (FFA) responds to faces
- parahippocampal place area (PPA) responds to places
the jennifer aniston neuron
Raster plot - graph used in neuroscience to show when individual neurons fire in response to stimuli
Note how the neuron fires much more in response to Jennifer Aniston than to other faces
Asking for Directions in the brain
Dorsal
Ventral
2 main processing streams originate in primary visual cortex (v1):
Where/How
Ventral stream: identifying objects (what)Damage causes visual agnosia (difficulty perceiving faces & objects)Dorsal stream: assessing the location of objects (where), and guiding our movement toward them (how)Damage causes optic ataxia (difficulty using vision to reach for & grasp objects)
What
Double dissociation study of the ventral & Dorsal streams
Double dissociation study: -tests if 2 tasks are supported by distinct brain regions-does this by lesioning 2 areas & then testing 2 tasks Landmark vs. object discrimination lesion study-dorsal stream lesion --> can't do landmark task ventral stream lesion --> can't do object discrimination task