“School of Cognitive Sciences”
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| Paper IPM / Cognitive Sciences / 7597 |
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When a global moving pattern is superimposed on a stationary object, the latter disappears and reappears alternately for periods of several seconds. This phenomenon is called 'motion-induced blindness' (MIB; Bonneh et al, 2001 Nature 411 798 - 801). We used an adaptation paradigm to determine whether orientation-selective adaptation exists in the MIB condition. In the first experiment, we found the optimal contrast in which a robust adaptation was achieved for the Gabor patches. In the second experiment, we obtained the minimum delay between the adaptation and test periods by which the effect of adaptation disappeared. In the third experiment, the adaptation to a Gabor patch was measured during blindness period if it was within the optimal delay time. The results showed that orientation-selective adaptation was preserved even when the Gabor patch perceptually disappeared to the subjects. Difference between same-adapt target and different-adapt target was significant for the blind stimulus (p < 0.0001) and was not significant for the control condition in which the adaptation stimulus was not presented during the blindness period. Since orientation information is processed in low-level visual areas like V1, we could conclude that MIB may be originating in an area higher than V1. These data also support the idea that neural activity in V1 is not a 'neural correlate of consciousness'
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