Action-specific extrapolation of target motion in human visual system

Neuropsychologia
Hiroshi Ashida

Abstract

Neuropsychological studies have indicated two distinct visual pathways in our brain, one dedicated to conscious perception and one to visuomotor control. Some psychophysical results support this idea with normal subjects, but they are still controversial. This study provides new psychophysical evidence for the dissociation by showing action-specific extrapolation of the visual target trajectory. When a moving target disappears, the perceived final position is liable to be shifted forward (representational momentum). In experiment 1, larger and more robust forward shifts were found when the position was directly touched without seeing the screen (open-loop pointing) than when the position was judged perceptually. The most striking dissociation was that fixation did not affect the forward shift in open-loop pointing while it almost abolished the shifts in perceptual judgements. In experiment 2, this action-specific result was found to disappear after a response delay of 4000 ms. Experiments 3 and 4 confirmed that the results were not affected by the external reference frames. The specific forward shifts found in open-loop pointing suggest that the visuomotor system compensates for the neural delays by extrapolating the target mot...Continue Reading

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Citations

Jan 18, 2005·Experimental Brain Research·David Whitney, Melvyn A Goodale
Dec 6, 2005·Experimental Brain Research·E PoljacA V van den Berg
Dec 15, 2007·Perception & Psychophysics·Koleen McCrinkGhislaine Dehaene-Lambertz
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Jun 12, 2012·Acta Psychologica·Virginie Crollen, Xavier Seron
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Jul 28, 2020·Neuroscience and Biobehavioral Reviews·Virginie Crollen, Olivier Collignon
Nov 10, 2021·Cognitive Processing·Nagireddy Neelakanteswar Reddy

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