The Craik-O'Brien-Cornsweet effect and brightness induction both proceed by the spreading of brightness information.
BACKGROUND
The Craik-O'Brien Cornsweet effect (COCE) is a visual illusion where the luminance of image boundaries sets the apparent brightness of enclosed regions. The COCE may be produced by the cortex constructing the observed brightness through a lateral 'filling-in' process: propagating brightness information from the edges of the enclosed regions towards their centres. Any such filling-in process would imply a speed of propagation.


METHODS
Data on the propagation speed of brightness information in two different brightness induction effects are compared using a multivariate regression analysis.


CONCLUSIONS
We demonstrate similar non-zero speeds for the COCE and for a brightness contrast effect.
Centre for Visual Sciences, Research School for Biological Sciences, Australian National University, Canberra, Australian Capital Territory. ted.maddess@anu.edu.au
T
T
Maddess
M P
MP
Davey
M V
MV
Srinivasan
A C
AC
James
D015350:Contrast Sensitivity; D006801:Humans; D008027:Light; D012044:Regression Analysis; D014785:Vision, Ocular / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*