PS267 Chapter Notes - Chapter 7-8: Supplementary Motor Area, Intraparietal Sulcus, Primary Motor Cortex
Document Summary
Erp study: p1 attention effect occurs at 70msec suggesting that p1 is a sensory wave. Attended target is being processed more in the brain than the unattended stimuli. Supports early-selection model fmri study with humans- selective spatial attention activates specific regions of the visual cortex. Biased competition model for selective attention: fmri study with humans; found attention to one stimulus abolishes the effect of the competing stimulus. Massive projections from visual cortex back to thalamus. Synapse on neurons in the thalamic reticular nucleus(aka perigeniculate nucleus) Examine how irrelevant stimuli affect reaction time to respond to a target. Find faster reaction times if the irrelevant stimuli appear spatially and temporally (50-200 msec) close to the target. Find slower reaction times if irrelevant stimuli appear >300 msec after target = inhibition of return. Erp data from people performing a reflexive cuing task show similar pattern.
