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Perifixational compression of space and time through masking| old_uid | 12904 |
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| title | Perifixational compression of space and time through masking |
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| start_date | 2013/10/18 |
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| schedule | 11h-12h |
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| online | no |
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| location_info | amphi Charvé |
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| summary | In everyday life, we explore our environment through movement and action. Even while sitting relaxed in a roadside café, our eyes move constantly to explore the scene. These eye movement cause disruptions in the visual input reaching our perceptual system. Generally we deal well with these disruptions, as we are usually not aware of them or even the fact that we have moved our eyes.
However, carefully conducted laboratory experiments have identified some perceptual errors around the time an eye movement is initiated. For instance, stimuli briefly flashed around the time of a saccade are perceived closer in time and space to the saccade target (Ross, Morrone, & Burr, 1997; Morrone, Ross, & Burr, 2005). In a series of experiments, we have demonstrated that similar distortions of space (Zimmermann, Fink, & Cavanagh, 2013) and time (Zimmermann, Born, Fink, & Cavanagh, 2013) can be found in the absence of eye or image motion where brief probes were attracted toward a visual reference when followed by a mask. We extend these studies to examples with a pair of references that draw the probe into the gap between them. Further, we observed reduced sensitivity to small stimulus “jumps” when masked, a finding that has also been reported when stimulus displacement is suppressed during a saccade (SSD, e.g. Deubel, Schneider, & Bridgeman, 1996). The phenomena may be explained by the summation of neural activity distributions. I will also discuss the possible role of apparent motion and mechanisms computing the likely offset between corresponding objects. |
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| responsibles | Pélissier |
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