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SUMMARY:Motion Perception -  from visual arts to neural processing - Johan
 nes M. Zanker\, Department of Psychology\, Royal Holloway University of Lo
 ndon
DTSTART:20061212T130000Z
DTEND:20061212T140000Z
UID:TALK5548@talks.cam.ac.uk
CONTACT:Cordula Becker
DESCRIPTION:Since many centuries\, artists have been puzzled by the proble
 m of representing depth and motion – the four-dimensional world – on a
  two-dimensional\, static surface. Many inventive and creative steps event
 ually led to a very peculiar use of motion illusions by some Op artists in
  the 20th century\, creating vivid sensations of movement from simple blac
 k and white patterns\, and thus setting the stage for a lively scientific 
 debate about possible visual processing mechanisms. Evidence is reviewed c
 ombining perceptual judgements of motion illusions and observations of eye
  movements with computer simulations of the induced optic flow. This work 
 suggests that the frequently executed small involuntary saccades would gen
 erate an incoherent distribution of motion signals that resemble the perce
 ptual effects experienced when viewing such patterns. The combined experim
 ental and computational evidence supports the view that the illusion is ca
 used by involuntary image displacements picked up by low-level motion dete
 ctors\, and also suggests that coherent motion signals are crucial to perc
 eive a stable world. Similar phenomena can be observed in other configurat
 ions of simple geometrical patterns\, which open new possibilities to crea
 te new dynamic illusions and study motion processing in the human brain. 
LOCATION:Seminar Room (ground floor)\, Craik-Marshall Building
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