Abstract
Pessoa and Neumann[1]summarize our results well and the comparison made with the results of De Weerd et al.[2]is interesting, provocative and worthy of experimental testing. They don't mention that, like De Weerd et al., we also find that cortical measures determine the speed of construction of illusory brightness. We showed that our observed flicker fusion frequencies for `Craik–O'Brien–Cornsweet effect' (COCE) gratings of different stripe widths could most simply be understood if one assumed a constant cortical propagation velocity, calculated as either 155 or 205mm.s−1 depending on whether V1 or V2 was involved. Other authors have reported that illusory brightness and actual brightness perception also take time and may involve a filling-in process[3, 4].
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