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| Research article summary (published 15 Aug 2002): |
Timing of bimanual movements in human and non-human primates in relation to neuronal activity in primary motor cortex and supplementary motor area.
Full Abstract
This study investigates the timing of bimanual movements in a combined behavioral and physiological approach. Human subjects and rhesus monkeys performed the same bimanual task. In monkeys, we simultaneously recorded neuronal activity in the two hemispheres of primary motor cortex (MI) or supplementary motor area (SMA), and related it to bimanual coordination in the temporal domain. Both for monkeys and humans, the reaction times of bimanual movements never significantly exceeded the reaction times of the slower arm in unimanual movements. Consistent with this, the longest delay between neural activity onset in SMA and MI and movement initiation was observed in unimanual movements of the slower arm and not in bimanual movements. Both results suggest that the programming of bimanual movements does not require more processing time than unimanual movements. They are also consistent with the view that bimanual movements are programmed in a single process, rather than by combining two separate unimanual movement plans. In both humans and monkeys, movement initiation was highly correlated between the arms. However, once movements began, the temporal correlation between the arms progressively declined. Movement decorrelation was accompanied by a net decorrelation of neuronal population activity in MI and SMA, suggesting a functional connection between neuronal interactions and the level of bimanual coupling and decoupling. The similarity of neuronal activities in MI and SMA in relationship to behavioral timing lends support to the idea that both areas are involved in the temporal coordination of the arms.
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Author information
Author/s: Gribova, A (A); Donchin, O (O); Bergman, H (H); Vaadia, E (E); Cardoso De Oliveira, S (S);
Affiliation: Department of Physiology and the Interdisciplinary Center for Neural Computation, The Hebrew University, Hadassah Medical School, POB 12272, Jerusalem 91120, Israel.
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale (Exp Brain Res), published in Germany. (Language: eng)
Reference: 2002-Oct; vol 146 (issue 3) : pp 322-35
Dates: Created 2002/09/16; Completed 2002/12/26; Revised 2008/02/15;
PMID: 12232689, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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