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 …