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Anticipatory grasping control modulates somatosensory perception

Voudouris, Dimitris ; Broda, Maximilian Davide ; Fiehler, Katja

Originalveröffentlichung: (2019) Journal of Vision 19(5):4 doi: 10.1167/19.5.4
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URN: urn:nbn:de:hebis:26-opus-152360

Sammlung: Open Access - Publikationsfonds
Universität Justus-Liebig-Universität Gießen
Institut: Abteilung Allgemeine Psychologie, Experimental Psychology
Fachgebiet: Psychologie
DDC-Sachgruppe: Psychologie
Dokumentart: Aufsatz
Sprache: Englisch
Erstellungsjahr: 2019
Publikationsdatum: 01.07.2020
Kurzfassung auf Englisch: Somatosensory perception is hampered on the moving limb during a goal-directed movement. This somatosensory suppression is mostly attributed to a forward model that predicts future states of the system based on the established motor command. Here, we examined whether and how this suppression is modulated by the predictability of object features important for controlling a grasping movement. Participants reached to grasp an object between thumb and index finger and then lifted it as straight as possible. Objects with symmetric or asymmetric mass distributions were presented either in a blocked or random manner, so that the object´s mass distribution could be anticipated or not. At the moment of object contact, a brief vibrotactile stimulus of varying intensities was presented on the dorsal part of the moving index finger. Participants had to report whether they detected the stimulus. When the object´s mass distribution was predictable, contact points with the object were modulated to the object´s centre of mass. This modulation contributed to a minimized resultant object roll during lifting. When the object´s mass distribution was unpredictable, participants chose a default grasping configuration, resulting in greater object roll for asymmetric mass distributions. Somatosensory perception was hampered when grasping both types of objects compared to baseline (no-movement). Importantly, somatosensory suppression was stronger when participants could predict the object´s mass distribution. We suggest that the strength of somatosensory suppression depends on the predictability of movement-relevant object features.
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