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The Craik-O'Brien-Cornsweet effect and brightness induction both proceed by the spreading of brightness information
T Maddess1, M P Davey, M V Srinivasan
1Centre for Visual Sciences, Research School for Biological Sciences, Australian National University, Canberra, Australian Capital Territory. ted.maddess@anu.edu.au
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.
Results/Conclusion:
We demonstrate similar non-zero speeds for the COCE and for a brightness contrast effect.