PS267 Lecture Notes - Lecture 14: Two-Streams Hypothesis, Extrastriate Cortex
Document Summary
Recall that objects are defined by their collection of elementary features. Erp study isolated the neural responses related to spatial attention and colour attention. Stare at +, flash red or blue rectangle on r or l side of screen, told to pay attention to only red rectangle on r side, ignore everything else. Erp study suggests that the mechanisms for spatial and feature attention are different. Result: erp signals for red on right below: big difference between red in attended vs unattended location. Pet study compared neural activity during divided attention and selective attention: selective attention condition asked: Was there a change in ______? (insert pre-determined feature of colour, shape or motion: divided attention condition asked: Pet study found selective attention to one feature activated distinct regions of the extrastriate cortex: suggests specialized feature analysis regions are modulated by selective attention, supports early-selection model of attention.
