A novel face aftereffect based on recognition contrast thresholds.
Previously, repulsive perceptual-shift face aftereffects have been reported. Here, we introduce a novel face adaptation method involving changes in contrast thresholds for face recognition. We find non-monotonic changes for adapted faces, with facilitation at short and suppression at long durations. Thresholds for unadapted faces were unaffected at short but elevated at long durations, more than those for the adapted face. A population-coding model showed that selective suppression of adapted representations cannot explain repulsive perceptual-bias aftereffects. The findings indicate greater complexity to adaptation, with facilitation, suppression, lateral inhibition of unadapted representations, and additional perceptual factors at long durations.
Oruç
Ipek
I
Human Vision and Eye Movement Laboratory, Department of Medicine (Neurology), University of British Columbia, Vancouver, BC, Canada. ipor@interchange.ubc.ca
Barton
Jason J S
JJ
D000328:Adult; D015350:Contrast Sensitivity / Q000502:physiology*; D005145:Face; D005260:Female; D005366:Figural Aftereffect / Q000502:physiology*; D006801:Humans; D008027:Light; D008297:Male; D010775:Photic Stimulation / Q000379:methods; D021641:Recognition, Psychology / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology*