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Inferring neural tuning from visual aftereffects

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If you have a question about this talk, please contact John Mollon.

Visual aftereffects between faces or other objects may provide a valuable tool to explore the number and tuning of neural channels that encode complex stimulus dimensions. Based on face aftereffect data, several groups have proposed that the dimensions underlying judgements of facial gender and identity are encoded by two-channel opponent mechanisms. I will show that changes in the appearance of adapting stimuli, often considered evidence for opponent mechanisms, can arise in several different encoding schemes, and argue that more diagnostic psychophysical tests suggest that multiple narrowly tuned channels underlie facial judgements.

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