The haptic oblique effect in the perception of rod orientation by blind adults.
Identifieur interne : 001F76 ( PubMed/Corpus ); précédent : 001F75; suivant : 001F77The haptic oblique effect in the perception of rod orientation by blind adults.
Auteurs : E. Gentaz ; Y. HatwellSource :
- Perception & psychophysics [ 0031-5117 ] ; 1998.
English descriptors
- KwdEn :
- MESH :
- etiology : Blindness.
- psychology : Blindness.
- Adult, Female, Form Perception, Gravitation, Humans, Male, Middle Aged, Orientation, Psychophysics, Stereognosis, Touch.
Abstract
The haptic perception of vertical, horizontal, +45 degrees oblique, and +135 degrees oblique orientations was studied in completely blind adults. The purpose was to determine whether the variations of the gravitational cues provided by the arm-hand system during scanning would affect the manifestation of the oblique effect (lower performance in oblique orientations than in vertical-horizontal ones) as they did in blindfolded sighted people (Gentaz & Hatwell, 1996). In blindfolded sighted adults, the oblique effect was reduced or absent when the magnitude of gravitational cues was decreased. If visual experience participated in the haptic oblique effect, we should observe no oblique effect in early blind subjects in the conditions of manual exploration where late blind and blindfolded sighted manifest this effect. The magnitude of gravitational cues was therefore varied by changing gravity constraints, whereas the variability of these cues was varied by changing the plane in which the task was performed: horizontal (low variability) and frontal (high variability). Early and late blind adults were asked to explore haptically a rod and then to reproduce its orientation ipsilaterally in one of two exploratory conditions in each plane. In the horizontal plane, the oblique effect was absent, whatever the gravity constraints, in both groups (early and late blind subjects). In the frontal plane, the oblique effect was present, whatever the gravity constraints, in both groups. Taken together, these results showed that, in blind people, the variability of gravitational cues played a role in the haptic oblique effect; no effect of previous visual experience was observed.
PubMed: 9503919
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Hatwell</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="1998">1998</date><idno type="RBID">pubmed:9503919</idno><idno type="pmid">9503919</idno><idno type="wicri:Area/PubMed/Corpus">001F76</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">The haptic oblique effect in the perception of rod orientation by blind adults.</title><author><name sortKey="Gentaz, E" sort="Gentaz, E" uniqKey="Gentaz E" first="E" last="Gentaz">E. Gentaz</name><affiliation><nlm:affiliation>Laboratoire de Psychologie Expérimentale, Université Pierre Mendès France, Grenoble, France. edouard.gentaz@upmf-grenoble.fr</nlm:affiliation></affiliation></author><author><name sortKey="Hatwell, Y" sort="Hatwell, Y" uniqKey="Hatwell Y" first="Y" last="Hatwell">Y. Hatwell</name></author></analytic><series><title level="j">Perception & psychophysics</title><idno type="ISSN">0031-5117</idno><imprint><date when="1998" type="published">1998</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term><term>Blindness (etiology)</term><term>Blindness (psychology)</term><term>Female</term><term>Form Perception</term><term>Gravitation</term><term>Humans</term><term>Male</term><term>Middle Aged</term><term>Orientation</term><term>Psychophysics</term><term>Stereognosis</term><term>Touch</term></keywords><keywords scheme="MESH" qualifier="etiology" xml:lang="en"><term>Blindness</term></keywords><keywords scheme="MESH" qualifier="psychology" xml:lang="en"><term>Blindness</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adult</term><term>Female</term><term>Form Perception</term><term>Gravitation</term><term>Humans</term><term>Male</term><term>Middle Aged</term><term>Orientation</term><term>Psychophysics</term><term>Stereognosis</term><term>Touch</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The haptic perception of vertical, horizontal, +45 degrees oblique, and +135 degrees oblique orientations was studied in completely blind adults. The purpose was to determine whether the variations of the gravitational cues provided by the arm-hand system during scanning would affect the manifestation of the oblique effect (lower performance in oblique orientations than in vertical-horizontal ones) as they did in blindfolded sighted people (Gentaz & Hatwell, 1996). In blindfolded sighted adults, the oblique effect was reduced or absent when the magnitude of gravitational cues was decreased. If visual experience participated in the haptic oblique effect, we should observe no oblique effect in early blind subjects in the conditions of manual exploration where late blind and blindfolded sighted manifest this effect. The magnitude of gravitational cues was therefore varied by changing gravity constraints, whereas the variability of these cues was varied by changing the plane in which the task was performed: horizontal (low variability) and frontal (high variability). Early and late blind adults were asked to explore haptically a rod and then to reproduce its orientation ipsilaterally in one of two exploratory conditions in each plane. In the horizontal plane, the oblique effect was absent, whatever the gravity constraints, in both groups (early and late blind subjects). In the frontal plane, the oblique effect was present, whatever the gravity constraints, in both groups. Taken together, these results showed that, in blind people, the variability of gravitational cues played a role in the haptic oblique effect; no effect of previous visual experience was observed.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">9503919</PMID><DateCreated><Year>1998</Year><Month>04</Month><Day>22</Day></DateCreated><DateCompleted><Year>1998</Year><Month>04</Month><Day>22</Day></DateCompleted><DateRevised><Year>2006</Year><Month>11</Month><Day>15</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0031-5117</ISSN><JournalIssue CitedMedium="Print"><Volume>60</Volume><Issue>1</Issue><PubDate><Year>1998</Year><Month>Jan</Month></PubDate></JournalIssue><Title>Perception & psychophysics</Title><ISOAbbreviation>Percept Psychophys</ISOAbbreviation></Journal><ArticleTitle>The haptic oblique effect in the perception of rod orientation by blind adults.</ArticleTitle><Pagination><MedlinePgn>157-67</MedlinePgn></Pagination><Abstract><AbstractText>The haptic perception of vertical, horizontal, +45 degrees oblique, and +135 degrees oblique orientations was studied in completely blind adults. The purpose was to determine whether the variations of the gravitational cues provided by the arm-hand system during scanning would affect the manifestation of the oblique effect (lower performance in oblique orientations than in vertical-horizontal ones) as they did in blindfolded sighted people (Gentaz & Hatwell, 1996). In blindfolded sighted adults, the oblique effect was reduced or absent when the magnitude of gravitational cues was decreased. If visual experience participated in the haptic oblique effect, we should observe no oblique effect in early blind subjects in the conditions of manual exploration where late blind and blindfolded sighted manifest this effect. The magnitude of gravitational cues was therefore varied by changing gravity constraints, whereas the variability of these cues was varied by changing the plane in which the task was performed: horizontal (low variability) and frontal (high variability). Early and late blind adults were asked to explore haptically a rod and then to reproduce its orientation ipsilaterally in one of two exploratory conditions in each plane. In the horizontal plane, the oblique effect was absent, whatever the gravity constraints, in both groups (early and late blind subjects). In the frontal plane, the oblique effect was present, whatever the gravity constraints, in both groups. Taken together, these results showed that, in blind people, the variability of gravitational cues played a role in the haptic oblique effect; no effect of previous visual experience was observed.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Gentaz</LastName><ForeName>E</ForeName><Initials>E</Initials><AffiliationInfo><Affiliation>Laboratoire de Psychologie Expérimentale, Université Pierre Mendès France, Grenoble, France. edouard.gentaz@upmf-grenoble.fr</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hatwell</LastName><ForeName>Y</ForeName><Initials>Y</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList></Article><MedlineJournalInfo><Country>UNITED STATES</Country><MedlineTA>Percept Psychophys</MedlineTA><NlmUniqueID>0200445</NlmUniqueID><ISSNLinking>0031-5117</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><CitationSubset>S</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName MajorTopicYN="N" UI="D000328">Adult</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D001766">Blindness</DescriptorName><QualifierName MajorTopicYN="N" UI="Q000209">etiology</QualifierName><QualifierName MajorTopicYN="Y" UI="Q000523">psychology</QualifierName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D005260">Female</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D005556">Form Perception</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D006112">Gravitation</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D006801">Humans</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D008297">Male</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D008875">Middle Aged</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D009949">Orientation</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="N" UI="D011601">Psychophysics</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D013236">Stereognosis</DescriptorName></MeshHeading><MeshHeading><DescriptorName MajorTopicYN="Y" UI="D014110">Touch</DescriptorName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>1998</Year><Month>3</Month><Day>21</Day></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>1998</Year><Month>3</Month><Day>21</Day><Hour>0</Hour><Minute>1</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>1998</Year><Month>3</Month><Day>21</Day><Hour>0</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">9503919</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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