Afterimage Filling-In Modulated By Stereo Disparity S Cecchetto, R Lawson, M Bertamini |
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Department of Psychological Sciences, University of Liverpool, United Kingdom
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| Colour afterimages depend on the shape of the test image, and coloured afterimages can be perceived at regions that were not adapted (van Lier, Vergeer, & Anstis, 2009). In our study we investigated whether the afterimage filled in was modulated by the cyclopean boundaries of a 3-D stimulus. Using stereograms and shutter glasses, we presented two orthogonal bars (one in front and one occluded) as adaptation stimuli. Each bar was composed of three squares of opponent colours (green and red). The central square was grey. Adaptation was followed by a test stimulus in which the bars (both grey) could have the same, the opposite or no disparity at all. Therefore, depth stratification was varied to be the same or different from adaptation to test. Observers wore 3-D glasses and performed a colour judgment task. On each trial, they judged depth stratification and which colour they perceived the test bars to be. Most of the participants perceived the front bar (and therefore also the central square) with a colour that was filled in with the opponent colour of the bar in the adaptation stimulus. Thus, our preliminary results show that the afterimage filling-in is modulated by stereo disparity and depth stratification. |
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