Research article summary:

Pointing movements may be produced in different frames of reference depending on the task demand.

Abstract Extract:
Movements are likely guided by the nervous system in task-specific spatial frames of reference (FRs). We tested this hypothesis by analyzing fast arm pointing movements involving the trunk made to targets located within the reach of the arm. In the first ... (Full abstract text below)

Published 2002Mar in Journal: Brain Res (Language : eng)

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1. Brain Res. 2002 Mar;929(1):117-28

Pointing movements may be produced in different frames of reference depending on the task demand.

Ghafouri M, Archambault PS, Adamovich SV, Feldman AG

Neurological Science Research Centre, Department of Physiology, University of Montreal and Research Centre, Rehabilitation Institute of Montreal, Montreal, Quebec, Canada H3S 2J4.

Movements are likely guided by the nervous system in task-specific spatial frames of reference (FRs). We tested this hypothesis by analyzing fast arm pointing movements involving the trunk made to targets located within the reach of the arm. In the first experiment, subjects pointed to a motionless target and, in the second experiment, to a target moving synchronously with the trunk. Vision of the arm and targets was prevented before movement onset. Each experiment started after three to five training trials. In randomly selected trials of both experiments, an electromagnet device unexpectedly prevented the trunk motion. When the trunk was arrested, the hand trajectory and velocity profile remained invariant in an FR associated with the experimental room in the first or in an FR moving with the trunk in the second experiment. Substantial changes in the arm interjoint coordination in response to the trunk arrest were observed in the first but not in the second experiment. The results demonstrate the ability of the nervous system to rapidly adapt behavior at the joint level to transform motor performance from a spatial FR associated with the environment to one associated with the body. A theoretical framework is suggested in which FRs are considered as pre-existing neurophysiological structures permitting switching between different FRs and guiding multiple joints and muscles without redundancy problems.

PMID : 11852038 [PubMed - Indexed for MEDLINE]

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Full Author Information

First Name	LastName	Initials
Mohammad	Ghafouri	M
Philippe S	Archambault	PS
Sergei V	Adamovich	SV
Anatol G	Feldman	AG

Affiliation: Neurological Science Research Centre, Department of Physiology, University of Montreal and Research Centre, Rehabilitation Institute of Montreal, Montreal, Quebec, Canada H3S 2J4.

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