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Open AccessArticle

Grasping Discriminates between Object Sizes Less Not More Accurately than the Perceptual System

1
Lehrstuhl für Klinische Neuropsychologie, Ludwig-Maximilian University Munich, Leopoldstr. 13, 80802 Munich, Germany
2
School of Psychology, University of Aberdeen King’s College, William Guild Building, Aberdeen AB24 3FX, UK
*
Author to whom correspondence should be addressed.
Vision 2019, 3(3), 36; https://doi.org/10.3390/vision3030036
Received: 19 March 2019 / Revised: 14 June 2019 / Accepted: 10 July 2019 / Published: 19 July 2019
(This article belongs to the Special Issue Visual Control of Action)
Ganel, Freud, Chajut, and Algom (2012) demonstrated that maximum grip apertures (MGAs) differ significantly when grasping perceptually identical objects. From this finding they concluded that the visual size information used by the motor system is more accurate than the visual size information available to the perceptual system. A direct comparison between the accuracy in the perception and the action system is, however, problematic, given that accuracy in the perceptual task is measured using a dichotomous variable, while accuracy in the visuomotor task is determined using a continuous variable. We addressed this problem by dichotomizing the visuomotor measures. Using this approach, our results show that size discrimination in grasping is in fact inferior to perceptual discrimination therefore contradicting the original suggestion put forward by Ganel and colleagues. View Full-Text
Keywords: perception-action model; Two Visual Streams Hypothesis; grasping; object size; Just Noticeable Difference perception-action model; Two Visual Streams Hypothesis; grasping; object size; Just Noticeable Difference
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Göhringer, F.; Löhr-Limpens, M.; Hesse, C.; Schenk, T. Grasping Discriminates between Object Sizes Less Not More Accurately than the Perceptual System. Vision 2019, 3, 36.

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