The spatiotemporal properties of the Craik-O'Brien-Cornsweet effect are consistent with 'filling-in'.
The Craik-O'Brien-Cornsweet effect (COCE) is an illusion in which luminance discontinuities give rise to illusory brightness. One hypothesised mechanism for the induction of illusory brightness is that the cortex constructs a brightness percept from edge information by a lateral 'filling-in' process. A requirement for the filling-in hypothesis is that ability of the illusion to form would be limited by the speed of propagation of the filling-in. The results presented here from three methods indicate that in the case of COCE gratings brightness information propagates at a fixed speed across the central visual field of about 19 degrees/s, and across visual areas V1 or V2 at 155 or 205 (+/- 20) mm/s, respectively.
Davey
M P
MP
Australian National University, Research School of Biological Sciences, Centre for Visual Sciences, Canberra, Australia.
Maddess
T
T
Srinivasan
M V
MV
D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D008027:Light; D008433:Mathematics; D009903:Optical Illusions / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D011594:Psychometrics; D012044:Regression Analysis; D012684:Sensory Thresholds / Q000502:physiology; D013997:Time Factors; D014793:Visual Cortex / Q000502:physiology