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The oranges and apples of distance perception| old_uid | 4494 |
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| title | The oranges and apples of distance perception |
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| start_date | 2008/04/01 |
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| schedule | 16h |
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| online | no |
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| details | Invité par Claude Prablanc |
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| summary | Reach-to-grasp movements are a ubiquitous feature of human behaviour. Accurate prehension requires the actor to determine the distance of an object from the hand. Vision provides many ‘cues’ (sources of information) to an actor regarding a fixated target object’s distance. I will suggest (and provide evidence) that one important cue is the extraretinal binocular cue of vergence angle. I will then address the question of how vergence information is combined with other cues to provide an accurate and reliable estimate of fixation distance. The issue of cue combination raises an additional question of what units the human nervous system uses to represent vergence information? I will present evidence suggesting that the system uses ‘nearness’ units (the reciprocal of distance). These data will be compared to data collected with visual form agnosic patient DF and be used to argue for low-level interactions between the ventral and dorsal stream of visual processing. |
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| responsibles | Farnè, Béranger, Soulier |
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