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

TitlePoor shape perception is the reason reaches-to-grasp are visually guided online
Authors
Issue Date2008
PublisherPsychonomic Society, Inc. The Journal's web site is located at http://www.psychonomic.org/PP/
Citation
Perception And Psychophysics, 2008, v. 70 n. 6, p. 1032-1046 How to Cite?
AbstractBoth 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 accurate grasping. Participants reached to grasp either with or without vision of the hand. The result was that the former was accurate, whereas the latter was not. We conclude that shape perception is not calibrated by feedback from reaches-to-grasp and that online visual guidance is required for accurate grasping because shape perception is poor. Copyright 2008 Psychonomic Society, Inc.
Persistent Identifierhttp://hdl.handle.net/10722/169050
ISSN
2010 Impact Factor: 2.216
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLee, YLen_US
dc.contributor.authorCrabtree, CEen_US
dc.contributor.authorNorman, JFen_US
dc.contributor.authorBingham, GPen_US
dc.date.accessioned2012-10-08T03:41:10Z-
dc.date.available2012-10-08T03:41:10Z-
dc.date.issued2008en_US
dc.identifier.citationPerception And Psychophysics, 2008, v. 70 n. 6, p. 1032-1046en_US
dc.identifier.issn0031-5117en_US
dc.identifier.urihttp://hdl.handle.net/10722/169050-
dc.description.abstractBoth 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 accurate grasping. Participants reached to grasp either with or without vision of the hand. The result was that the former was accurate, whereas the latter was not. We conclude that shape perception is not calibrated by feedback from reaches-to-grasp and that online visual guidance is required for accurate grasping because shape perception is poor. Copyright 2008 Psychonomic Society, Inc.en_US
dc.languageengen_US
dc.publisherPsychonomic Society, Inc. The Journal's web site is located at http://www.psychonomic.org/PP/en_US
dc.relation.ispartofPerception and Psychophysicsen_US
dc.subject.meshAdulten_US
dc.subject.meshForm Perceptionen_US
dc.subject.meshHand Strengthen_US
dc.subject.meshHumansen_US
dc.subject.meshInterneten_US
dc.subject.meshJudgmenten_US
dc.subject.meshVisual Perceptionen_US
dc.titlePoor shape perception is the reason reaches-to-grasp are visually guided onlineen_US
dc.typeArticleen_US
dc.identifier.emailLee, YL:younglee@hku.hken_US
dc.identifier.authorityLee, YL=rp00866en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.3758/PP.70.6.1032en_US
dc.identifier.pmid18717389-
dc.identifier.scopuseid_2-s2.0-50249139686en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-50249139686&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume70en_US
dc.identifier.issue6en_US
dc.identifier.spage1032en_US
dc.identifier.epage1046en_US
dc.identifier.isiWOS:000257974600009-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridLee, YL=15033830300en_US
dc.identifier.scopusauthoridCrabtree, CE=10044075500en_US
dc.identifier.scopusauthoridNorman, JF=7402491550en_US
dc.identifier.scopusauthoridBingham, GP=7004801753en_US
dc.identifier.citeulike3039261-

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