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Titre du document / Document title

The coordination patterns observed when two hands reach-to-grasp separate objects

Auteur(s) / Author(s)

BINGHAM Geoffrey P. (1) ; HUGHES Kirstie (2) ; MON-WILLIAMS Mark (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Psychology, Indiana University, Bloomington, IN 47405, ETATS-UNIS
(2) College of Medicine and Life Sciences, University of Aberdeen, Aberdeen AB24 2UB, Scotland, ROYAUME-UNI

Résumé / Abstract

What determines coordination patterns when both hands reach to grasp separate objects at the same time? It is known that synchronous timing is preferred as the most stable mode of bimanual coordination. Nonetheless, normal unimanual prehension behaviour predicts asynchrony when the two hands reach towards unequal targets, with synchrony restricted to targets equal in size and distance. Additionally, sufficiently separated targets require sequential looking. Does synchrony occur in all cases because it is preferred in bimanual coordination or does asynchrony occur because of unimanual task constraints and the need for sequential looking? We investigated coordinative timing when participants (n = 8) moved their right (preferred) hand to the same object at a fixed distance but the left hand to objects of different width (3, 5, and 7 cm) and grip surface size (1, 2, and 3 cm) placed at different distances (20, 30, and 40 cm) over 270 randomised trials. The hand movements consisted of two components: (1) an initial component (IC) during which the hand reached towards the target while forming an appropriate grip aperture, stopping at (but not touching) the object; (2) a completion component (CC) during which the finger and thumb closed on the target. The two limbs started the IC together but did not interact until the deceleration phase when evidence of synchronisation began to appear. Nonetheless, asynchronous timing was present at the end of the IC and preserved through the CC even with equidistant targets. Thus, there was synchrony but requirements for visual information ultimately yielded asynchronous coordinative timing.

Revue / Journal Title

Experimental brain research    ISSN  0014-4819   CODEN EXBRAP 

Source / Source

2008, vol. 184, no3, pp. 283-293 [11 page(s) (article)] (3/4 p.)

Langue / Language

Anglais

Editeur / Publisher

Springer, Heidelberg, ALLEMAGNE  (1966) (Revue)

Mots-clés anglais / English Keywords

Human

;

Thumb

;

Sequential

;

Distance

;

Manual task

;

Bimanual task

;

Timing

;

Gripping

;

Hand

;

Coordination

;

Mots-clés français / French Keywords

Homme

;

Pouce

;

Séquentiel

;

Distance

;

Tâche manuelle

;

Tâche bimanuelle

;

Timing

;

Préhension

;

Main

;

Coordination

;

Mots-clés espagnols / Spanish Keywords

Hombre

;

Pulgar

;

Secuencial

;

Distancia

;

Tarea manual

;

Tarea bimanual

;

Timing

;

Prension

;

Mano

;

Coordinación

;

Mots-clés d'auteur / Author Keywords

Bimanual

;

Prehension

;

Movement

;

Coordination

;

Attention

;

Localisation / Location

INIST-CNRS, Cote INIST : 12535, 35400017450843.0010

Nº notice refdoc (ud4) : 19958760



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