Pantomime-grasping: the 'return' of haptic feedback supports the absolute specification of object size.
Identifieur interne : 000678 ( Main/Merge ); précédent : 000677; suivant : 000679Pantomime-grasping: the 'return' of haptic feedback supports the absolute specification of object size.
Auteurs : Shirin Davarpanah Jazi [Canada] ; Michelle Yau ; David A. Westwood ; Matthew HeathSource :
- Experimental brain research [ 1432-1106 ] ; 2015.
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Abstract
When an individual grasps a physical object, the visuomotor system is able to specify grip aperture via absolute visual information. In contrast, grasping to a location previously occupied by an object (i.e., pantomime-grasping) results in the specification of grip aperture via relative visual information. The basis for the dissociable visual codes is thought to reflect that pantomime-grasping is a perception-based task. It is, however, important to recognize that grasping a physical object and pantomime-grasping differ not only in terms of their visuospatial properties but also with respect to the availability of haptic feedback: Grasping a physical object provides haptic cues derived from touching the object, whereas no such feedback is available in a traditional pantomime-grasping task. As such, we examined whether haptic feedback influences the information supporting a pantomime-grasp performed after a 1000-ms visual delay. Participants completed responses in each of the three tasks: (1) grasping a physical object, (2) traditional pantomime-grasping wherein the to-be-grasped object was removed from the grasping environment and (3) pantomime-grasping wherein the experimenter placed the object between participants' thumb and forefinger once they had completed their response (i.e., pantomime-grasping with haptic feedback). Just-noticeable-difference (JND) scores were computed to determine whether responses adhered to or violated the psychophysical (i.e., relative) principles of Weber's law. JNDs for the traditional pantomime-grasping task adhered to Weber's law, whereas JNDs for grasping a physical object and for pantomime-grasping with haptic feedback violated the law. Thus, we propose that convergent visual and haptic cues support the absolute specification of object size in a pantomime-grasping task. Furthermore, our results highlight the important role of multisensory cue integration in a target-defined grasping task.
DOI: 10.1007/s00221-015-4274-0
PubMed: 25869741
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Westwood</name></author><author><name sortKey="Heath, Matthew" sort="Heath, Matthew" uniqKey="Heath M" first="Matthew" last="Heath">Matthew Heath</name></author></analytic><series><title level="j">Experimental brain research</title><idno type="eISSN">1432-1106</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adolescent</term><term>Adult</term><term>Analysis of Variance</term><term>Biomechanical Phenomena</term><term>Feedback, Sensory (physiology)</term><term>Female</term><term>Hand Strength (physiology)</term><term>Humans</term><term>Male</term><term>Memory</term><term>Psychomotor Performance (physiology)</term><term>Psychophysics</term><term>Touch (physiology)</term><term>Touch Perception (physiology)</term><term>Young Adult</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Feedback, Sensory</term><term>Hand Strength</term><term>Psychomotor Performance</term><term>Touch</term><term>Touch Perception</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adolescent</term><term>Adult</term><term>Analysis of Variance</term><term>Biomechanical Phenomena</term><term>Female</term><term>Humans</term><term>Male</term><term>Memory</term><term>Psychophysics</term><term>Young Adult</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">When an individual grasps a physical object, the visuomotor system is able to specify grip aperture via absolute visual information. In contrast, grasping to a location previously occupied by an object (i.e., pantomime-grasping) results in the specification of grip aperture via relative visual information. The basis for the dissociable visual codes is thought to reflect that pantomime-grasping is a perception-based task. It is, however, important to recognize that grasping a physical object and pantomime-grasping differ not only in terms of their visuospatial properties but also with respect to the availability of haptic feedback: Grasping a physical object provides haptic cues derived from touching the object, whereas no such feedback is available in a traditional pantomime-grasping task. As such, we examined whether haptic feedback influences the information supporting a pantomime-grasp performed after a 1000-ms visual delay. Participants completed responses in each of the three tasks: (1) grasping a physical object, (2) traditional pantomime-grasping wherein the to-be-grasped object was removed from the grasping environment and (3) pantomime-grasping wherein the experimenter placed the object between participants' thumb and forefinger once they had completed their response (i.e., pantomime-grasping with haptic feedback). Just-noticeable-difference (JND) scores were computed to determine whether responses adhered to or violated the psychophysical (i.e., relative) principles of Weber's law. JNDs for the traditional pantomime-grasping task adhered to Weber's law, whereas JNDs for grasping a physical object and for pantomime-grasping with haptic feedback violated the law. Thus, we propose that convergent visual and haptic cues support the absolute specification of object size in a pantomime-grasping task. Furthermore, our results highlight the important role of multisensory cue integration in a target-defined grasping task.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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