How a lateralized brain supports symmetrical bimanual tasks.

Abstract:

:A large repertoire of natural object manipulation tasks require precisely coupled symmetrical opposing forces by both hands on a single object. We asked how the lateralized brain handles this basic problem of spatial and temporal coordination. We show that the brain consistently appoints one of the hands as prime actor while the other assists, but the choice of acting hand is flexible. When study participants control a cursor by manipulating a tool held freely between the hands, the left hand becomes prime actor if the cursor moves directionally with the left-hand forces, whereas the right hand primarily acts if it moves with the opposing right-hand forces. In neurophysiological (electromyography, transcranial magnetic brain stimulation) and functional magnetic resonance brain imaging experiments we demonstrate that changes in hand assignment parallels a midline shift of lateralized activity in distal hand muscles, corticospinal pathways, and primary sensorimotor and cerebellar cortical areas. We conclude that the two hands can readily exchange roles as dominant actor in bimanual tasks. Spatial relationships between hand forces and goal motions determine hand assignments rather than habitual handedness. Finally, flexible role assignment of the hands is manifest at multiple levels of the motor system, from cortical regions all the way down to particular muscles.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Johansson RS,Theorin A,Westling G,Andersson M,Ohki Y,Nyberg L

doi

10.1371/journal.pbio.0040158

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

e158

issue

6

eissn

1544-9173

issn

1545-7885

pii

05-PLBI-RA-1423R2

journal_volume

4

pub_type

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