Haptic discrimination of stimuli varying in amplitude and width.
Identifieur interne : 001C56 ( PubMed/Corpus ); précédent : 001C55; suivant : 001C57Haptic discrimination of stimuli varying in amplitude and width.
Auteurs : Stefan Louw ; Astrid M L. Kappers ; Jan J. KoenderinkSource :
- Experimental brain research [ 0014-4819 ] ; 2002.
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Abstract
We studied active haptic discrimination of the geometrical features of an object. The geometrical parameters under investigation were the amplitude and width of a gaussian-shaped surface. Haptic discrimination thresholds were measured with regard to three values of these geometrical parameters. We found that humans discriminate up to about 300 shapes when both amplitude and width are extrapolated to the range between 1 micro m and 1 m. Over this range, which covers the span of the arms, the number of discriminations is small compared to the number across the full range of chromaticities in vision. Roughly speaking, humans are far better at discriminating sharp (extensive amplitude and little width) gaussian surfaces from smooth (small amplitude and extensive width) ones than they are at discriminating small (small amplitude and width) surfaces from large (extensive amplitude and width) ones. Our main conclusion is that discrimination in the geometrical domain is poorest when the proportion between amplitude and width is roughly the same for both shapes. Our results are in close agreement with results of earlier experiments on detection thresholds. This indicates that similar, or even the same, neural mechanisms were used for detection and discrimination of the geometrical parameters under investigation.
DOI: 10.1007/s00221-002-1148-z
PubMed: 12192575
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Koenderink</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2002">2002</date><idno type="RBID">pubmed:12192575</idno><idno type="pmid">12192575</idno><idno type="doi">10.1007/s00221-002-1148-z</idno><idno type="wicri:Area/PubMed/Corpus">001C56</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Haptic discrimination of stimuli varying in amplitude and width.</title><author><name sortKey="Louw, Stefan" sort="Louw, Stefan" uniqKey="Louw S" first="Stefan" last="Louw">Stefan Louw</name><affiliation><nlm:affiliation>Helmholtz Instituut, Princetonplein 5, 3584 CC Utrecht, The Netherlands.</nlm:affiliation></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></author><author><name sortKey="Koenderink, Jan J" sort="Koenderink, Jan J" uniqKey="Koenderink J" first="Jan J" last="Koenderink">Jan J. Koenderink</name></author></analytic><series><title level="j">Experimental brain research</title><idno type="ISSN">0014-4819</idno><imprint><date when="2002" type="published">2002</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term><term>Algorithms</term><term>Differential Threshold</term><term>Discrimination (Psychology) (physiology)</term><term>Female</term><term>Form Perception (physiology)</term><term>Humans</term><term>Male</term><term>Photic Stimulation</term><term>Pilot Projects</term><term>Psychometrics</term><term>Visual Perception (physiology)</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Discrimination (Psychology)</term><term>Form Perception</term><term>Visual Perception</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adult</term><term>Algorithms</term><term>Differential Threshold</term><term>Female</term><term>Humans</term><term>Male</term><term>Photic Stimulation</term><term>Pilot Projects</term><term>Psychometrics</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We studied active haptic discrimination of the geometrical features of an object. The geometrical parameters under investigation were the amplitude and width of a gaussian-shaped surface. Haptic discrimination thresholds were measured with regard to three values of these geometrical parameters. We found that humans discriminate up to about 300 shapes when both amplitude and width are extrapolated to the range between 1 micro m and 1 m. Over this range, which covers the span of the arms, the number of discriminations is small compared to the number across the full range of chromaticities in vision. Roughly speaking, humans are far better at discriminating sharp (extensive amplitude and little width) gaussian surfaces from smooth (small amplitude and extensive width) ones than they are at discriminating small (small amplitude and width) surfaces from large (extensive amplitude and width) ones. Our main conclusion is that discrimination in the geometrical domain is poorest when the proportion between amplitude and width is roughly the same for both shapes. Our results are in close agreement with results of earlier experiments on detection thresholds. This indicates that similar, or even the same, neural mechanisms were used for detection and discrimination of the geometrical parameters under investigation.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">12192575</PMID><DateCreated><Year>2002</Year><Month>08</Month><Day>22</Day></DateCreated><DateCompleted><Year>2002</Year><Month>12</Month><Day>02</Day></DateCompleted><DateRevised><Year>2013</Year><Month>12</Month><Day>13</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0014-4819</ISSN><JournalIssue CitedMedium="Print"><Volume>146</Volume><Issue>1</Issue><PubDate><Year>2002</Year><Month>Sep</Month></PubDate></JournalIssue><Title>Experimental brain research</Title><ISOAbbreviation>Exp Brain Res</ISOAbbreviation></Journal><ArticleTitle>Haptic discrimination of stimuli varying in amplitude and width.</ArticleTitle><Pagination><MedlinePgn>32-7</MedlinePgn></Pagination><Abstract><AbstractText>We studied active haptic discrimination of the geometrical features of an object. The geometrical parameters under investigation were the amplitude and width of a gaussian-shaped surface. Haptic discrimination thresholds were measured with regard to three values of these geometrical parameters. We found that humans discriminate up to about 300 shapes when both amplitude and width are extrapolated to the range between 1 micro m and 1 m. Over this range, which covers the span of the arms, the number of discriminations is small compared to the number across the full range of chromaticities in vision. Roughly speaking, humans are far better at discriminating sharp (extensive amplitude and little width) gaussian surfaces from smooth (small amplitude and extensive width) ones than they are at discriminating small (small amplitude and width) surfaces from large (extensive amplitude and width) ones. Our main conclusion is that discrimination in the geometrical domain is poorest when the proportion between amplitude and width is roughly the same for both shapes. Our results are in close agreement with results of earlier experiments on detection thresholds. 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