Discrimination thresholds for haptic perception of volume, surface area, and weight
Identifieur interne : 001B64 ( Ncbi/Merge ); précédent : 001B63; suivant : 001B65Discrimination thresholds for haptic perception of volume, surface area, and weight
Auteurs : Mirela Kahrimanovic [Pays-Bas] ; Wouter M. Bergmann Tiest [Pays-Bas] ; Astrid M. L. Kappers [Pays-Bas]Source :
- Attention, Perception & Psychophysics [ 1943-3921 ] ; 2011.
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Abstract
The present study investigated the human ability to discriminate the size of 3-D objects by touch.
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DOI: 10.3758/s13414-011-0202-y
PubMed: 21870206
PubMed Central: 3222810
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Kappers</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">21870206</idno><idno type="pmc">3222810</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3222810</idno><idno type="RBID">PMC:3222810</idno><idno type="doi">10.3758/s13414-011-0202-y</idno><date when="2011">2011</date><idno type="wicri:Area/Pmc/Corpus">000739</idno><idno type="wicri:Area/Pmc/Curation">000739</idno><idno type="wicri:Area/Pmc/Checkpoint">001B76</idno><idno type="wicri:source">PubMed</idno><idno type="wicri:Area/PubMed/Corpus">000E16</idno><idno type="wicri:Area/PubMed/Curation">000E16</idno><idno type="wicri:Area/PubMed/Checkpoint">000D80</idno><idno type="wicri:Area/Ncbi/Merge">001B64</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Discrimination thresholds for haptic perception of volume, surface area, and weight</title><author><name sortKey="Kahrimanovic, Mirela" sort="Kahrimanovic, Mirela" uniqKey="Kahrimanovic M" first="Mirela" last="Kahrimanovic">Mirela Kahrimanovic</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author><author><name sortKey="Bergmann Tiest, Wouter M" sort="Bergmann Tiest, Wouter M" uniqKey="Bergmann Tiest W" first="Wouter M." last="Bergmann Tiest">Wouter M. Bergmann Tiest</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author><author><name sortKey="Kappers, Astrid M L" sort="Kappers, Astrid M L" uniqKey="Kappers A" first="Astrid M. L." last="Kappers">Astrid M. L. Kappers</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author></analytic><series><title level="j">Attention, Perception & Psychophysics</title><idno type="ISSN">1943-3921</idno><idno type="eISSN">1943-393X</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Depth Perception</term><term>Differential Threshold</term><term>Discrimination (Psychology)</term><term>Female</term><term>Humans</term><term>Male</term><term>Sensory Deprivation</term><term>Sensory Thresholds</term><term>Size Perception</term><term>Stereognosis</term><term>Touch</term><term>Weight Perception</term><term>Young Adult</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Depth Perception</term><term>Differential Threshold</term><term>Discrimination (Psychology)</term><term>Female</term><term>Humans</term><term>Male</term><term>Sensory Deprivation</term><term>Sensory Thresholds</term><term>Size Perception</term><term>Stereognosis</term><term>Touch</term><term>Weight Perception</term><term>Young Adult</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>The present study investigated the human ability to discriminate the size of 3-D objects by touch. <xref rid="Sec2" ref-type="sec">Experiment 1</xref> measured the just noticeable differences (JNDs) for three tasks: (1) discrimination of volume without availability of weight information, (2) discrimination of volume with weight information available, and (3) discrimination of surface area. Stimuli consisted of spheres, cubes, and tetrahedrons. For all shapes, two reference sizes were used (3.5 and 12 cm<sup>3</sup>). No significant effect of task on the discriminability of objects was found, but the effects of shape and size were significant, as well as the interaction between these two factors. Post hoc analysis revealed that for the small reference, the Weber fractions for the tetrahedron were significantly larger than the fractions for the cube and the sphere. In <xref rid="Sec5" ref-type="sec">Experiment 2</xref>, the JNDs for haptic perception of weight were measured for the same objects as those used in <xref rid="Sec2" ref-type="sec">Experiment 1</xref>. The shape of objects had no significant effect on the Weber fractions for weight, but the Weber fractions for the small stimuli were larger than the fractions for the large stimuli. Surprisingly, a comparison between the two experiments showed that the Weber fractions for weight were significantly larger than the fractions for volume with availability of weight information. Taken together, the results reveal that volume and weight information are not effectively combined in discrimination tasks. This study provides detailed insight into the accuracy of the haptic system in discriminating objects’ size. This substantial set of data satisfies the need for more fundamental knowledge on haptic size perception, necessary for a greater understanding of the perception of related properties, as well as of more general perceptual processes.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Coren, S" uniqKey="Coren S">S Coren</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Dietze, Ag" uniqKey="Dietze A">AG Dietze</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Durlach, Ni" uniqKey="Durlach N">NI Durlach</name></author><author><name sortKey="Delhorne, La" uniqKey="Delhorne L">LA Delhorne</name></author><author><name sortKey="Wong, A" uniqKey="Wong A">A Wong</name></author><author><name sortKey="Ko, Wy" uniqKey="Ko W">WY Ko</name></author><author><name sortKey="Rabinowitz, Wm" uniqKey="Rabinowitz W">WM Rabinowitz</name></author><author><name sortKey="Hollerbach, J" uniqKey="Hollerbach J">J Hollerbach</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Evans, Gb" uniqKey="Evans G">GB Evans</name></author><author><name sortKey="Howarth, E" uniqKey="Howarth E">E Howarth</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Gaydos, Hf" uniqKey="Gaydos H">HF Gaydos</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Jones, La" uniqKey="Jones L">LA Jones</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kahrimanovic, M" uniqKey="Kahrimanovic M">M Kahrimanovic</name></author><author><name sortKey="Bergmann Tiest, Wm" uniqKey="Bergmann Tiest W">WM Bergmann Tiest</name></author><author><name sortKey="Kappers, Aml" uniqKey="Kappers A">AML Kappers</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kelvin, Rp" uniqKey="Kelvin R">RP Kelvin</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Klatzky, Rl" uniqKey="Klatzky R">RL Klatzky</name></author><author><name sortKey="Lederman, S" uniqKey="Lederman S">S Lederman</name></author><author><name sortKey="Reed, C" uniqKey="Reed C">C Reed</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Krishna, A" uniqKey="Krishna A">A Krishna</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Langfeld, Hs" uniqKey="Langfeld H">HS Langfeld</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lederman, Sj" uniqKey="Lederman S">SJ Lederman</name></author><author><name sortKey="Klatzky, Rl" uniqKey="Klatzky R">RL Klatzky</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Plaisier, Ma" uniqKey="Plaisier M">MA Plaisier</name></author><author><name sortKey="Bergmann Tiest, Wm" uniqKey="Bergmann Tiest W">WM Bergmann Tiest</name></author><author><name sortKey="Kappers, Am" uniqKey="Kappers A">AM Kappers</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Stevens, Ss" uniqKey="Stevens S">SS Stevens</name></author><author><name sortKey="Stone, G" uniqKey="Stone G">G Stone</name></author></analytic></biblStruct></listBibl></div1></back></TEI><double pmid="21870206"><pmc><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Discrimination thresholds for haptic perception of volume, surface area, and weight</title><author><name sortKey="Kahrimanovic, Mirela" sort="Kahrimanovic, Mirela" uniqKey="Kahrimanovic M" first="Mirela" last="Kahrimanovic">Mirela Kahrimanovic</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author><author><name sortKey="Bergmann Tiest, Wouter M" sort="Bergmann Tiest, Wouter M" uniqKey="Bergmann Tiest W" first="Wouter M." last="Bergmann Tiest">Wouter M. Bergmann Tiest</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author><author><name sortKey="Kappers, Astrid M L" sort="Kappers, Astrid M L" uniqKey="Kappers A" first="Astrid M. L." last="Kappers">Astrid M. L. Kappers</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">21870206</idno><idno type="pmc">3222810</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3222810</idno><idno type="RBID">PMC:3222810</idno><idno type="doi">10.3758/s13414-011-0202-y</idno><date when="2011">2011</date><idno type="wicri:Area/Pmc/Corpus">000739</idno><idno type="wicri:Area/Pmc/Curation">000739</idno><idno type="wicri:Area/Pmc/Checkpoint">001B76</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Discrimination thresholds for haptic perception of volume, surface area, and weight</title><author><name sortKey="Kahrimanovic, Mirela" sort="Kahrimanovic, Mirela" uniqKey="Kahrimanovic M" first="Mirela" last="Kahrimanovic">Mirela Kahrimanovic</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author><author><name sortKey="Bergmann Tiest, Wouter M" sort="Bergmann Tiest, Wouter M" uniqKey="Bergmann Tiest W" first="Wouter M." last="Bergmann Tiest">Wouter M. Bergmann Tiest</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author><author><name sortKey="Kappers, Astrid M L" sort="Kappers, Astrid M L" uniqKey="Kappers A" first="Astrid M. L." last="Kappers">Astrid M. L. Kappers</name><affiliation wicri:level="1"><nlm:aff id="Aff1">Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands</nlm:aff><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author></analytic><series><title level="j">Attention, Perception & Psychophysics</title><idno type="ISSN">1943-3921</idno><idno type="eISSN">1943-393X</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>The present study investigated the human ability to discriminate the size of 3-D objects by touch. <xref rid="Sec2" ref-type="sec">Experiment 1</xref> measured the just noticeable differences (JNDs) for three tasks: (1) discrimination of volume without availability of weight information, (2) discrimination of volume with weight information available, and (3) discrimination of surface area. Stimuli consisted of spheres, cubes, and tetrahedrons. For all shapes, two reference sizes were used (3.5 and 12 cm<sup>3</sup>). No significant effect of task on the discriminability of objects was found, but the effects of shape and size were significant, as well as the interaction between these two factors. Post hoc analysis revealed that for the small reference, the Weber fractions for the tetrahedron were significantly larger than the fractions for the cube and the sphere. In <xref rid="Sec5" ref-type="sec">Experiment 2</xref>, the JNDs for haptic perception of weight were measured for the same objects as those used in <xref rid="Sec2" ref-type="sec">Experiment 1</xref>. The shape of objects had no significant effect on the Weber fractions for weight, but the Weber fractions for the small stimuli were larger than the fractions for the large stimuli. Surprisingly, a comparison between the two experiments showed that the Weber fractions for weight were significantly larger than the fractions for volume with availability of weight information. Taken together, the results reveal that volume and weight information are not effectively combined in discrimination tasks. This study provides detailed insight into the accuracy of the haptic system in discriminating objects’ size. This substantial set of data satisfies the need for more fundamental knowledge on haptic size perception, necessary for a greater understanding of the perception of related properties, as well as of more general perceptual processes.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Coren, S" uniqKey="Coren S">S Coren</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Dietze, Ag" uniqKey="Dietze A">AG Dietze</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Durlach, Ni" uniqKey="Durlach N">NI Durlach</name></author><author><name sortKey="Delhorne, La" uniqKey="Delhorne L">LA Delhorne</name></author><author><name sortKey="Wong, A" uniqKey="Wong A">A Wong</name></author><author><name sortKey="Ko, Wy" uniqKey="Ko W">WY Ko</name></author><author><name sortKey="Rabinowitz, Wm" uniqKey="Rabinowitz W">WM Rabinowitz</name></author><author><name sortKey="Hollerbach, J" uniqKey="Hollerbach J">J Hollerbach</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Evans, Gb" uniqKey="Evans G">GB Evans</name></author><author><name sortKey="Howarth, E" uniqKey="Howarth E">E Howarth</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Gaydos, Hf" uniqKey="Gaydos H">HF Gaydos</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Jones, La" uniqKey="Jones L">LA Jones</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kahrimanovic, M" uniqKey="Kahrimanovic M">M Kahrimanovic</name></author><author><name sortKey="Bergmann Tiest, Wm" uniqKey="Bergmann Tiest W">WM Bergmann Tiest</name></author><author><name sortKey="Kappers, Aml" uniqKey="Kappers A">AML Kappers</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kelvin, Rp" uniqKey="Kelvin R">RP Kelvin</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Klatzky, Rl" uniqKey="Klatzky R">RL Klatzky</name></author><author><name sortKey="Lederman, S" uniqKey="Lederman S">S Lederman</name></author><author><name sortKey="Reed, C" uniqKey="Reed C">C Reed</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Krishna, A" uniqKey="Krishna A">A Krishna</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Langfeld, Hs" uniqKey="Langfeld H">HS Langfeld</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lederman, Sj" uniqKey="Lederman S">SJ Lederman</name></author><author><name sortKey="Klatzky, Rl" uniqKey="Klatzky R">RL Klatzky</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Plaisier, Ma" uniqKey="Plaisier M">MA Plaisier</name></author><author><name sortKey="Bergmann Tiest, Wm" uniqKey="Bergmann Tiest W">WM Bergmann Tiest</name></author><author><name sortKey="Kappers, Am" uniqKey="Kappers A">AM Kappers</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Stevens, Ss" uniqKey="Stevens S">SS Stevens</name></author><author><name sortKey="Stone, G" uniqKey="Stone G">G Stone</name></author></analytic></biblStruct></listBibl></div1></back></TEI></pmc><pubmed><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Discrimination thresholds for haptic perception of volume, surface area, and weight.</title><author><name sortKey="Kahrimanovic, Mirela" sort="Kahrimanovic, Mirela" uniqKey="Kahrimanovic M" first="Mirela" last="Kahrimanovic">Mirela Kahrimanovic</name><affiliation wicri:level="1"><nlm:affiliation>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands. m.kahrimanovic@uu.nl</nlm:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author><author><name sortKey="Bergmann Tiest, Wouter M" sort="Bergmann Tiest, Wouter M" uniqKey="Bergmann Tiest W" first="Wouter M" last="Bergmann Tiest">Wouter M. Bergmann Tiest</name></author><author><name sortKey="Kappers, Astrid M L" sort="Kappers, Astrid M L" uniqKey="Kappers A" first="Astrid M L" last="Kappers">Astrid M L. Kappers</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2011">2011</date><idno type="doi">10.3758/s13414-011-0202-y</idno><idno type="RBID">pubmed:21870206</idno><idno type="pmid">21870206</idno><idno type="wicri:Area/PubMed/Corpus">000E16</idno><idno type="wicri:Area/PubMed/Curation">000E16</idno><idno type="wicri:Area/PubMed/Checkpoint">000D80</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Discrimination thresholds for haptic perception of volume, surface area, and weight.</title><author><name sortKey="Kahrimanovic, Mirela" sort="Kahrimanovic, Mirela" uniqKey="Kahrimanovic M" first="Mirela" last="Kahrimanovic">Mirela Kahrimanovic</name><affiliation wicri:level="1"><nlm:affiliation>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht, The Netherlands. m.kahrimanovic@uu.nl</nlm:affiliation><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Helmholtz Institute, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht</wicri:regionArea><wicri:noRegion>3584 CH Utrecht</wicri:noRegion></affiliation></author><author><name sortKey="Bergmann Tiest, Wouter M" sort="Bergmann Tiest, Wouter M" uniqKey="Bergmann Tiest W" first="Wouter M" last="Bergmann Tiest">Wouter M. Bergmann Tiest</name></author><author><name sortKey="Kappers, Astrid M L" sort="Kappers, Astrid M L" uniqKey="Kappers A" first="Astrid M L" last="Kappers">Astrid M L. Kappers</name></author></analytic><series><title level="j">Attention, perception & psychophysics</title><idno type="eISSN">1943-393X</idno><imprint><date when="2011" type="published">2011</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Depth Perception</term><term>Differential Threshold</term><term>Discrimination (Psychology)</term><term>Female</term><term>Humans</term><term>Male</term><term>Sensory Deprivation</term><term>Sensory Thresholds</term><term>Size Perception</term><term>Stereognosis</term><term>Touch</term><term>Weight Perception</term><term>Young Adult</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Depth Perception</term><term>Differential Threshold</term><term>Discrimination (Psychology)</term><term>Female</term><term>Humans</term><term>Male</term><term>Sensory Deprivation</term><term>Sensory Thresholds</term><term>Size Perception</term><term>Stereognosis</term><term>Touch</term><term>Weight Perception</term><term>Young Adult</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The present study investigated the human ability to discriminate the size of 3-D objects by touch. Experiment 1 measured the just noticeable differences (JNDs) for three tasks: (1) discrimination of volume without availability of weight information, (2) discrimination of volume with weight information available, and (3) discrimination of surface area. Stimuli consisted of spheres, cubes, and tetrahedrons. For all shapes, two reference sizes were used (3.5 and 12 cm(3)). No significant effect of task on the discriminability of objects was found, but the effects of shape and size were significant, as well as the interaction between these two factors. Post hoc analysis revealed that for the small reference, the Weber fractions for the tetrahedron were significantly larger than the fractions for the cube and the sphere. In Experiment 2, the JNDs for haptic perception of weight were measured for the same objects as those used in Experiment 1. The shape of objects had no significant effect on the Weber fractions for weight, but the Weber fractions for the small stimuli were larger than the fractions for the large stimuli. Surprisingly, a comparison between the two experiments showed that the Weber fractions for weight were significantly larger than the fractions for volume with availability of weight information. Taken together, the results reveal that volume and weight information are not effectively combined in discrimination tasks. This study provides detailed insight into the accuracy of the haptic system in discriminating objects' size. This substantial set of data satisfies the need for more fundamental knowledge on haptic size perception, necessary for a greater understanding of the perception of related properties, as well as of more general perceptual processes.</div></front></TEI></pubmed></double></record>Pour manipuler ce document sous Unix (Dilib)
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