?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Modulation+of+Responses+to+Optic+Flow+in+Area+7a+by+Retinotopic+++and+Oculomotor+Cues+in+Monkey&rft.creator=Read%2C+Heather+L&rft.creator=Siegel%2C+Ralph+M&rft.subject=Neuroanatomy&rft.subject=Neurology&rft.description=Perception+of+two-and-three+dimensional+optic+flow+critically+depends+upon+extrastriate+cortices+that+are+part+of+the+%22dorsal+stream%22+for+visual+processing.+Neurons+in+area+7a%2C+a+sub-region+of+the+posterior+parietal+cortex%2C+have+a+dual+sensitivity+to+visual+input+and+to+eye+position.+The+sensitivity+and+selectivity+of+area+7a+neurons+to+three+sensory+cues+were+studied%3A+optic+flow%2C+retinotopic+stimulus+position%2C+and+eye+position.+The+visual+response+to+optic+flow+was+modulated+by+the+retinotopic+stimulus+position+and+by+the+eye+position+in+the+orbit.+The+position+dependence+of+the+retinal+and+eye+position+modulation+(i.e.+gain+field)+were+quantified+by+a+quadratic+regression+model+that+allowed+for+linear+or+peaked+receptive+fields.+A+local+maximum+(or+minimum)+in+both+the+retinotopic+fields+and+the+gain+fields+was+observed+suggesting+that+these+sensory+qualities+are+not+necessarily+linearly+represented+in+area+7a.+Neurons+were+also+found+that+simply+encoded+the+eye+position+in+the+absence+of+optic+flow.+The+spatial+tuning+for+the+eye+position+signals+upon+stationary+stimuli+and+optic+flow+was+not+the+same+suggesting+multiple+anatomical+sources+of+the+signals.+These+neurons+can+provide+a+substrate+for+spatial+representation+while+primates+move+in+the+environment.&rft.date=1997&rft.type=Journal+(Paginated)&rft.type=NonPeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F7%2F1%2Faogexpt_final_withfigs.htm&rft.identifier=++Read%2C+Heather+L+and+Siegel%2C+Ralph+M++(1997)+Modulation+of+Responses+to+Optic+Flow+in+Area+7a+by+Retinotopic+and+Oculomotor+Cues+in+Monkey.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F7%2F