Coordination between the transport and the grasp components during prehension movements.
Identifieur interne : 002175 ( PubMed/Curation ); précédent : 002174; suivant : 002176Coordination between the transport and the grasp components during prehension movements.
Auteurs : S. Chieffi [Italie] ; M. GentilucciSource :
- Experimental brain research [ 0014-4819 ] ; 1993.
English descriptors
- KwdEn :
- MESH :
- physiology : Fingers.
- Adult, Humans, Male, Motor Activity, Movement, Psychomotor Performance, Regression Analysis, Space Perception, Time Factors.
Abstract
In this study, the possible influence of the transport on the grasp component of prehension movements was investigated. The first phase of the transport (acceleration phase) and of the grasp (finger aperture phase) kinematics were studied under conditions of visual and non-visual object presentation (prehension experiment). In the non-visual condition, object size was estimated by haptics and object position was estimated by proprioception. Eight subjects were required to reach and grasp three objects of different size located at two distances. An additional experiment (matching experiment) was carried out to control the scaling of object size in two conditions. The results showed that in the matching experiment size estimation for large objects was similar in the two conditions, whereas small stimuli were underestimated in the haptic condition. In the prehension experiment, maximal finger aperture and velocity of finger aperture were greater in the non-visual than in the visual condition, and the difference was greater for small than for large stimuli. Moreover, in both conditions, finger opening was larger for prehension movements directed to the far than to the near objects, but only for smaller stimuli. Hand trajectory variability increased in the non-visual condition and with the distance, whereas finger opening variability was only affected by the non-visual condition. For smaller stimuli, increased finger opening with distance was positively correlated with the increase in wrist variability in the visual condition, but not in the non-visual condition. Furthermore, increased finger opening between visual and non-visual conditions was correlated with the increase in wrist variability, for smaller objects at the near object location.(ABSTRACT TRUNCATED AT 250 WORDS)
PubMed: 8359261
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Gentilucci</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="1993">1993</date><idno type="RBID">pubmed:8359261</idno><idno type="pmid">8359261</idno><idno type="wicri:Area/PubMed/Corpus">002175</idno><idno type="wicri:Area/PubMed/Curation">002175</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Coordination between the transport and the grasp components during prehension movements.</title><author><name sortKey="Chieffi, S" sort="Chieffi, S" uniqKey="Chieffi S" first="S" last="Chieffi">S. Chieffi</name><affiliation wicri:level="1"><nlm:affiliation>Instituto di Fisiologia Umana, Università di Parma, Italy.</nlm:affiliation><country xml:lang="fr">Italie</country><wicri:regionArea>Instituto di Fisiologia Umana, Università di Parma</wicri:regionArea></affiliation></author><author><name sortKey="Gentilucci, M" sort="Gentilucci, M" uniqKey="Gentilucci M" first="M" last="Gentilucci">M. Gentilucci</name></author></analytic><series><title level="j">Experimental brain research</title><idno type="ISSN">0014-4819</idno><imprint><date when="1993" type="published">1993</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term><term>Fingers (physiology)</term><term>Humans</term><term>Male</term><term>Motor Activity</term><term>Movement</term><term>Psychomotor Performance</term><term>Regression Analysis</term><term>Space Perception</term><term>Time Factors</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Fingers</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adult</term><term>Humans</term><term>Male</term><term>Motor Activity</term><term>Movement</term><term>Psychomotor Performance</term><term>Regression Analysis</term><term>Space Perception</term><term>Time Factors</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In this study, the possible influence of the transport on the grasp component of prehension movements was investigated. The first phase of the transport (acceleration phase) and of the grasp (finger aperture phase) kinematics were studied under conditions of visual and non-visual object presentation (prehension experiment). In the non-visual condition, object size was estimated by haptics and object position was estimated by proprioception. Eight subjects were required to reach and grasp three objects of different size located at two distances. An additional experiment (matching experiment) was carried out to control the scaling of object size in two conditions. The results showed that in the matching experiment size estimation for large objects was similar in the two conditions, whereas small stimuli were underestimated in the haptic condition. In the prehension experiment, maximal finger aperture and velocity of finger aperture were greater in the non-visual than in the visual condition, and the difference was greater for small than for large stimuli. Moreover, in both conditions, finger opening was larger for prehension movements directed to the far than to the near objects, but only for smaller stimuli. Hand trajectory variability increased in the non-visual condition and with the distance, whereas finger opening variability was only affected by the non-visual condition. For smaller stimuli, increased finger opening with distance was positively correlated with the increase in wrist variability in the visual condition, but not in the non-visual condition. Furthermore, increased finger opening between visual and non-visual conditions was correlated with the increase in wrist variability, for smaller objects at the near object location.(ABSTRACT TRUNCATED AT 250 WORDS)</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">8359261</PMID><DateCreated><Year>1993</Year><Month>09</Month><Day>24</Day></DateCreated><DateCompleted><Year>1993</Year><Month>09</Month><Day>24</Day></DateCompleted><DateRevised><Year>2013</Year><Month>12</Month><Day>13</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0014-4819</ISSN><JournalIssue CitedMedium="Print"><Volume>94</Volume><Issue>3</Issue><PubDate><Year>1993</Year></PubDate></JournalIssue><Title>Experimental brain research</Title><ISOAbbreviation>Exp Brain Res</ISOAbbreviation></Journal><ArticleTitle>Coordination between the transport and the grasp components during prehension movements.</ArticleTitle><Pagination><MedlinePgn>471-7</MedlinePgn></Pagination><Abstract><AbstractText>In this study, the possible influence of the transport on the grasp component of prehension movements was investigated. The first phase of the transport (acceleration phase) and of the grasp (finger aperture phase) kinematics were studied under conditions of visual and non-visual object presentation (prehension experiment). In the non-visual condition, object size was estimated by haptics and object position was estimated by proprioception. Eight subjects were required to reach and grasp three objects of different size located at two distances. An additional experiment (matching experiment) was carried out to control the scaling of object size in two conditions. The results showed that in the matching experiment size estimation for large objects was similar in the two conditions, whereas small stimuli were underestimated in the haptic condition. In the prehension experiment, maximal finger aperture and velocity of finger aperture were greater in the non-visual than in the visual condition, and the difference was greater for small than for large stimuli. Moreover, in both conditions, finger opening was larger for prehension movements directed to the far than to the near objects, but only for smaller stimuli. Hand trajectory variability increased in the non-visual condition and with the distance, whereas finger opening variability was only affected by the non-visual condition. For smaller stimuli, increased finger opening with distance was positively correlated with the increase in wrist variability in the visual condition, but not in the non-visual condition. 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