Control of hand shaping in response to object shape perturbation

Caterina Ansuini, Marco Santello, Federico Tubaldi, Stefano Massaccesi, Umberto Castiello

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

This study assessed how hand shaping responds to a perturbation of object shape. In blocked trials (80% of total), subjects were instructed to reach, to grasp and lift a concave or a convex object. In perturbed trials (20% of total), a rotating device allowed for the rapid change from the concave to the convex object or vice versa. In this situation subjects grasped the last presented object. Flexion/extension at the metacarpal-phalangeal and proximal interphalangeal joints of all digits was measured by resistive sensors embedded in a glove. In the blocked condition we found that most joints of the fingers were modulated by the type of the to-be-grasped object during the reach. When object shape was perturbed, reach duration was longer and angular excursion of all fingers differed with respect to blocked trials. For the 'convex → concave' perturbation, a greater degree of finger extension was found than during the blocked 'concave' trials. In contrast, for the 'concave → convex' perturbation, fingers were more flexed than for the blocked 'convex' trials. The thumb reacted to the perturbation showing a similar pattern (i.e., over-flexion with respect to the blocked trials) regardless the 'direction' of the perturbation. The present results suggest that applying an object shape perturbation during a reach-to-grasp action determines a reorganization of all digits. This pattern is suggestive of a control strategy, which assigns to opposing digits different roles.

Original languageEnglish (US)
Pages (from-to)85-96
Number of pages12
JournalExperimental Brain Research
Volume180
Issue number1
DOIs
StatePublished - Jun 2007

Fingerprint

Fingers
Hand
Finger Joint
Metacarpal Bones
Thumb
Hand Strength
Joints
Equipment and Supplies
Direction compound

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Control of hand shaping in response to object shape perturbation. / Ansuini, Caterina; Santello, Marco; Tubaldi, Federico; Massaccesi, Stefano; Castiello, Umberto.

In: Experimental Brain Research, Vol. 180, No. 1, 06.2007, p. 85-96.

Research output: Contribution to journalArticle

Ansuini, Caterina ; Santello, Marco ; Tubaldi, Federico ; Massaccesi, Stefano ; Castiello, Umberto. / Control of hand shaping in response to object shape perturbation. In: Experimental Brain Research. 2007 ; Vol. 180, No. 1. pp. 85-96.
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