Factors influencing the radial-tangential illusion in haptic perception
Identifieur interne : 005C21 ( Main/Merge ); précédent : 005C20; suivant : 005C22Factors influencing the radial-tangential illusion in haptic perception
Auteurs : James Mcfarland [États-Unis] ; John F. Soechting [États-Unis]Source :
- Experimental brain research [ 0014-4819 ] ; 2007.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Homme.
English descriptors
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Abstract
According to the radial-tangential illusion, in the horizontal plane, arm movements executed in directions radial to the trunk are sensed to be longer than movements of the same length in the orthogonal direction. It has been suggested that the illusion arises from the fact that radially directed movements are executed more slowly and require more effort. These suggestions were tested in a series of experiments, using a robotically controlled manipulandum. In all of the experiments subjects grasped the handle of the manipulandum, in some cases exploring the virtual boundary of a rectangle, while in others being guided along a rectangular contour by the robot. In a two-alternative forced choice design, subjects reported whether the rectangle was wide or narrow. In a control experiment, subjects manifested the radial-tangential illusion. Contrary to the hypothesis, the magnitude of this illusion was not altered when a resistive force was added in the tangential direction or when the ratio of movement times in the tangential and radial directions was changed. However, when the contour was explored in the counterclockwise direction, the illusion was much smaller than when it was explored in the clockwise direction. A second series of experiments, in which subjects only explored two sides (i.e., an L-shape), demonstrated that this effect arose from distortions induced by the serial ordering of the exploratory movements. The illusion was much smaller when the radial segment was explored first. We suggest that this distortion arises from the serial nature of haptic exploration, in which the length of the initial segment decreases as it is stored in working memory for subsequent comparison.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Factors influencing the radial-tangential illusion in haptic perception</title><author><name sortKey="Mcfarland, James" sort="Mcfarland, James" uniqKey="Mcfarland J" first="James" last="Mcfarland">James Mcfarland</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Physics, Pomona College</s1><s2>Claremont, CA</s2><s3>USA</s3><sZ>1 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Soechting, John F" sort="Soechting, John F" uniqKey="Soechting J" first="John F." last="Soechting">John F. Soechting</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Department of Neuroscience, University of Minnesota, 6-145 Jackson Hall, 321 Church St SE</s1><s2>Minneapolis, MN 55455</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Minnesota</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">07-0194034</idno><date when="2007">2007</date><idno type="stanalyst">PASCAL 07-0194034 INIST</idno><idno type="RBID">Pascal:07-0194034</idno><idno type="wicri:Area/PascalFrancis/Corpus">000B70</idno><idno type="wicri:Area/PascalFrancis/Curation">000925</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000849</idno><idno type="wicri:doubleKey">0014-4819:2007:Mcfarland J:factors:influencing:the</idno><idno type="wicri:Area/Main/Merge">005C21</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Factors influencing the radial-tangential illusion in haptic perception</title><author><name sortKey="Mcfarland, James" sort="Mcfarland, James" uniqKey="Mcfarland J" first="James" last="Mcfarland">James Mcfarland</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Department of Physics, Pomona College</s1><s2>Claremont, CA</s2><s3>USA</s3><sZ>1 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Soechting, John F" sort="Soechting, John F" uniqKey="Soechting J" first="John F." last="Soechting">John F. Soechting</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Department of Neuroscience, University of Minnesota, 6-145 Jackson Hall, 321 Church St SE</s1><s2>Minneapolis, MN 55455</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Minnesota</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Experimental brain research</title><title level="j" type="abbreviated">Exp. brain res.</title><idno type="ISSN">0014-4819</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Experimental brain research</title><title level="j" type="abbreviated">Exp. brain res.</title><idno type="ISSN">0014-4819</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Body movement</term><term>Force</term><term>Gripping</term><term>Haptic perception</term><term>Human</term><term>Perceptual illusion</term><term>Working memory</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Illusion perceptive</term><term>Mouvement corporel</term><term>Préhension</term><term>Force</term><term>Mémoire travail</term><term>Homme</term><term>Perception haptique</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Homme</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">According to the radial-tangential illusion, in the horizontal plane, arm movements executed in directions radial to the trunk are sensed to be longer than movements of the same length in the orthogonal direction. It has been suggested that the illusion arises from the fact that radially directed movements are executed more slowly and require more effort. These suggestions were tested in a series of experiments, using a robotically controlled manipulandum. In all of the experiments subjects grasped the handle of the manipulandum, in some cases exploring the virtual boundary of a rectangle, while in others being guided along a rectangular contour by the robot. In a two-alternative forced choice design, subjects reported whether the rectangle was wide or narrow. In a control experiment, subjects manifested the radial-tangential illusion. Contrary to the hypothesis, the magnitude of this illusion was not altered when a resistive force was added in the tangential direction or when the ratio of movement times in the tangential and radial directions was changed. However, when the contour was explored in the counterclockwise direction, the illusion was much smaller than when it was explored in the clockwise direction. A second series of experiments, in which subjects only explored two sides (i.e., an L-shape), demonstrated that this effect arose from distortions induced by the serial ordering of the exploratory movements. The illusion was much smaller when the radial segment was explored first. We suggest that this distortion arises from the serial nature of haptic exploration, in which the length of the initial segment decreases as it is stored in working memory for subsequent comparison.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li><li>Minnesota</li></region></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Mcfarland, James" sort="Mcfarland, James" uniqKey="Mcfarland J" first="James" last="Mcfarland">James Mcfarland</name></region><name sortKey="Soechting, John F" sort="Soechting, John F" uniqKey="Soechting J" first="John F." last="Soechting">John F. Soechting</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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