A motion aftereffect seen more strongly by the non-adapted eye: evidence of multistage adaptation in visual motion processing.
We found that the motion aftereffect measured using a directionally ambiguous counterphase grating (flicker MAE) can be stronger when it is measured for the non-adapted eye than when measured for the adapted eye. The monocularly viewed adaptation stimulus was the movement of a missing-fundamental grating (2f+3f motion), for which the movement of the higher-order spatial structure was dominantly perceived, while the first-order structure was physically moving in the opposite direction. For observers who perceived the MAE consistently in the direction opposite to the movement of the higher-order structures, the MAE was larger for the non-adapted eye than for the adapted eye. This finding of 'over-100% transfer' invalidates the standard view that the IOT is a direct measure of the binocularity of the adapted neurones. In addition, the finding provides convincing support for the hypothesis that the flicker MAE reflects adaptation at multiple processing stages
Human and Information Science Laboratory, NTT Communication Science Laboratories, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan. nishida@apollo3.brl.ntt.co.jp
S
S
Nishida
H
H
Ashida
D000222:Adaptation, Physiological / Q000502:physiology*; D005366:Figural Aftereffect / Q000502:physiology*; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D011601:Psychophysics; D015348:Vision, Binocular / Q000502:physiology; D015349:Vision, Monocular / Q000502:physiology; D014795:Visual Pathways / Q000502:physiology