high order visual processing in cortex

secondary visual cortex V2-V4-ITC

eceives information from area V1, processes information further, and sends it to other areas

V2 cells respond to what

illusory edges, like the sides of this triangle, even though no edge is drawn

V4

responds to concentric, radial and spiral patterns, color perception/constancy (damage causes loss of color vision)

itc

processing gets more complex from back to front, ending in cells that respond to whole objects and faces

how does ITC respond

to object regardless size.angle , damage leads to bad object recognition

visual agonsia

inability to recognize objects despite normal vision (damage to ITC)

Prosopagnosia

inability to recognize faces; caused by damage to face-selective areas of the ITC, on the underside of the temporal lobe

MT

respond to motion in a particular direction and speed

motion blindness

inability to perceive whether objects are moving, or their direction and speed

blindsight

some people with V1 damage but an intact MT report seeing nothing, yet can still detect the direction of a moving stimulus

posterior parietal cotex and prefrontal cortex

regions that recive converging sensory/motor infro, bind them