Poor shape perception is the reason reaches-to-grasp are visually guided online.
Identifieur interne : 000E99 ( Ncbi/Merge ); précédent : 000E98; suivant : 000F00Poor shape perception is the reason reaches-to-grasp are visually guided online.
Auteurs : Young-Lim Lee [États-Unis] ; Charles E. Crabtree ; J Farley Norman ; Geoffrey P. BinghamSource :
- Perception & psychophysics [ 0031-5117 ] ; 2008.
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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 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.
PubMed: 18717389
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Bingham</name></author></analytic><series><title level="j">Perception & psychophysics</title><idno type="ISSN">0031-5117</idno><imprint><date when="2008" type="published">2008</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term><term>Form Perception</term><term>Hand Strength</term><term>Humans</term><term>Internet</term><term>Judgment</term><term>Visual Perception</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adult</term><term>Form Perception</term><term>Hand Strength</term><term>Humans</term><term>Internet</term><term>Judgment</term><term>Visual Perception</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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 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.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">18717389</PMID><DateCreated><Year>2008</Year><Month>08</Month><Day>22</Day></DateCreated><DateCompleted><Year>2008</Year><Month>10</Month><Day>03</Day></DateCompleted><Article PubModel="Print"><Journal><ISSN IssnType="Print">0031-5117</ISSN><JournalIssue CitedMedium="Print"><Volume>70</Volume><Issue>6</Issue><PubDate><Year>2008</Year><Month>Aug</Month></PubDate></JournalIssue><Title>Perception & psychophysics</Title><ISOAbbreviation>Percept Psychophys</ISOAbbreviation></Journal><ArticleTitle>Poor shape perception is the reason reaches-to-grasp are visually guided online.</ArticleTitle><Pagination><MedlinePgn>1032-46</MedlinePgn></Pagination><Abstract><AbstractText>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 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.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Lee</LastName><ForeName>Young-Lim</ForeName><Initials>YL</Initials><AffiliationInfo><Affiliation>Indiana University, Bloomington, Indiana 47405-7007, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Crabtree</LastName><ForeName>Charles E</ForeName><Initials>CE</Initials></Author><Author ValidYN="Y"><LastName>Norman</LastName><ForeName>J Farley</ForeName><Initials>JF</Initials></Author><Author ValidYN="Y"><LastName>Bingham</LastName><ForeName>Geoffrey P</ForeName><Initials>GP</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Percept Psychophys</MedlineTA><NlmUniqueID>0200445</NlmUniqueID><ISSNLinking>0031-5117</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName MajorTopicYN="N" UI="D000328">Adult</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D005556">Form Perception</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D018737">Hand Strength</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D006801">Humans</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D020407">Internet</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D007600">Judgment</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D014796">Visual Perception</DescriptorName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2008</Year><Month>8</Month><Day>23</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2008</Year><Month>10</Month><Day>4</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2008</Year><Month>8</Month><Day>23</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">18717389</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country></list><tree><noCountry><name sortKey="Bingham, Geoffrey P" sort="Bingham, Geoffrey P" uniqKey="Bingham G" first="Geoffrey P" last="Bingham">Geoffrey P. Bingham</name><name sortKey="Crabtree, Charles E" sort="Crabtree, Charles E" uniqKey="Crabtree C" first="Charles E" last="Crabtree">Charles E. Crabtree</name><name sortKey="Norman, J Farley" sort="Norman, J Farley" uniqKey="Norman J" first="J Farley" last="Norman">J Farley Norman</name></noCountry><country name="États-Unis"><noRegion><name sortKey="Lee, Young Lim" sort="Lee, Young Lim" uniqKey="Lee Y" first="Young-Lim" last="Lee">Young-Lim Lee</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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