Poor shape perception is the reason reaches-to-grasp are visually guided online

Perception & Psychophysics
Young-Lim LeeGeoffrey P Bingham

Abstract

Both judgment studies and studies of feedforward reaching have shown that the visual perception of object distance, size, and shape are inaccurate. However, feedback has been shown to calibrate feedfoward reaches-to-grasp to make them accurate with respect to object distance and size. We now investigate whether shape perception (in particular, the aspect ratio of object depth to width) can be calibrated in the context of reaches-to-grasp. We used cylindrical objects with elliptical cross-sections of varying eccentricity. Our participants reached to grasp the width or the depth of these objects with the index finger and thumb. The maximum grasp aperture and the terminal grasp aperture were used to evaluate perception. Both occur before the hand has contacted an object. In Experiments 1 and 2, we investigated whether perceived shape is recalibrated by distorted haptic feedback. Although somewhat equivocal, the results suggest that it is not. In Experiment 3, we tested the accuracy of feedforward grasping with respect to shape with haptic feedback to allow calibration. Grasping was inaccurate in ways comparable to findings in shape perception judgment studies. In Experiment 4, we hypothesized that online guidance is needed for acc...Continue Reading

Citations

Jun 10, 2010·Experimental Brain Research·Scott T Grafton
Apr 13, 2011·Experimental Brain Research·Mark Mon-Williams, Geoffrey P Bingham
Nov 28, 2012·Experimental Brain Research·Young Lim LeeGeoffrey P Bingham
Dec 15, 2010·Proceedings. Biological Sciences·Francesco CampanellaMaria Concetta Morrone
Jul 30, 2014·Experimental Brain Research·Rebekka VerheijJeroen B J Smeets
Aug 10, 2010·Vision Research·Melvyn A Goodale
Aug 30, 2011·Strabismus·Simon Grant, Merrick J Moseley
Aug 14, 2012·Vision Research·Young-Lim LeeGeoffrey P Bingham
Feb 10, 2018·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Xavier CorveleynMuriel Boucart
Sep 12, 2019·Attention, Perception & Psychophysics·Xiaoye Michael WangGeoffrey P Bingham
Aug 29, 2020·Journal of Glaucoma·Xavier CorveleynMuriel Boucart
Aug 14, 2015·Journal of Neurophysiology·Chiara Bozzacchi, Fulvio Domini
Mar 10, 2019·Experimental Brain Research·Simon Grant, Miriam L Conway

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