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SUMMARY:The effect of contextual motion on perceived speed\, plaid directi
 on and binocular rivalry - Dr. Daniel H. Baker\, Aston University
DTSTART:20091204T130000Z
DTEND:20091204T140000Z
UID:TALK20906@talks.cam.ac.uk
CONTACT:John Mollon
DESCRIPTION:It is well established that the perceived speed of a target st
 imulus can be strongly modulated by surrounding motion (a phenomenon often
  termed simultaneous motion contrast). Psychophysical experiments show tha
 t at medium target speeds (1deg/sec)\, the modulation is directionally tun
 ed\, with same direction surrounds generally reducing perceived target spe
 ed\, and opposite direction surrounds increasing it. These processes are b
 roadly tuned spatially\, and increase in magnitude with surround speed. I 
 will present evidence that such effects occur at an early stage of process
 ing\, before the calculation of pattern motion direction.  Dominance durin
 g binocular rivalry is also found to depend on perceived speed\, rather th
 an physical speed\, which also points to an early locus for contextual inf
 luences. These results will be discussed with reference to findings from s
 ingle-cell physiology\, as well as other  psychophysical surround effects 
 which are often attributed to surround suppression in extra-striate areas 
 (i.e. MT).
LOCATION:Kenneth Craik Room\, Craik-Marshall Building\, Downing Site
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