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SUMMARY:V&C Seminar // "Balancing visual prediction and visual stability"
DTSTART:20141205T110000
DTSTAMP:20260407T200721Z
UID:234ab419764e19cc95901c4983b1e909af3c939d977745880e588309
CATEGORIES:Conferences - Seminars
DESCRIPTION:David Whitney\,\nUniversity of California\, Berkeley\nAbstract
  :\nThe visual world is dynamic\, but object identities do not randomly ch
 ange from moment to moment\; objects often change location smoothly\, but 
 they rarely pop into or out of existence. This presents two major challeng
 es for the visual system. On one hand\, because visual processing is slugg
 ish\, there is a need to predict changing object locations. On the other h
 and\, because visual input is noisy and discontinuous\, there is a need to
  represent object identities as continuous and stable. In three related li
 nes of research in my lab\, we have investigated how the visual system bal
 ances these competing goals of prediction and stability. First\, we have u
 sed fMRI to isolate a mechanism that gates and filters information about d
 istractor objects\, which allows selective representation of attended obje
 cts. Second\, using psychophysics\, TMS\, and fMRI\, we have found that th
 e visual system assigns predictive locations to dynamic objects\, thus ant
 icipating smoothly changing visual input. In a third line of research\, we
  have found evidence for a mechanism that links the perception of an objec
 t's identity and properties from moment to moment\, thus promoting percept
 ual continuity. These results show that an object's present appearance is 
 captured by what was perceived over the last several seconds. The spatiote
 mporal tuning of this serial dependence reveals the continuity field (CF)\
 , within which perceptual judgments are dictated by previous percepts--mak
 ing different objects appear the same. Together\, our results reveal how t
 he visual system delicately balances the need to optimize sensitivity to i
 mage changes (prediction) with the desire to represent the temporal contin
 uity of objects-the likelihood that objects perceived at this moment tend 
 to exist in subsequent moments.
LOCATION:SV 3510 http://plan.epfl.ch/?lang=fr&room=sv3510
STATUS:CONFIRMED
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