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J Neurophysiol 89: 1126-1135, 2003. First published October 23, 2002; doi:10.1152/jn.00775.2002
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J Neurophysiol (February 1, 2003). 10.1152/jn.00775.2002
Submitted on Submitted 9 September 2002; accepted in final form 14 October 2002

Neural Networks for the Coordination of the Hands in Time

Fredrik Ullén, Hans Forssberg, and H. Henrik Ehrsson

Neuropediatric Research Unit, Department of Woman and Child Health, Karolinska Institutet, SE-171 76 Stockholm, Sweden

Ullén, Fredrik, Hans Forssberg, and H. Henrik Ehrsson. Neural Networks for the Coordination of the Hands in Time. J. Neurophysiol. 89: 1126-1135, 2003. Without practice, bimanual movements can typically be performed either in phase or in antiphase. Complex temporal coordination, e.g., during movements at different frequencies with a noninteger ratio (polyrhythms), requires training. Here, we investigate the organization of the neural control systems for in-phase, antiphase, and polyrhythmic coordination using functional magnetic resonance imaging (fMRI). Brisk rhythmic tapping with the index fingers was used as a model behavior. We demonstrate different patterns of brain activity during in-phase and antiphase coordination. In-phase coordination was characterized by activation of the right anterior cerebellum and cingulate motor area (CMA). Antiphase coordination was accompanied by extensive fronto-parieto-temporal activations, including the supplementary motor area (SMA), the preSMA, and the bilateral inferior parietal gyri, premotor cortex, and superior temporal gyri. When contrasting polyrhythmic tapping with in-phase tapping, activity was seen in the same set of brain regions, and in the posterior cerebellum and the CMA. Antiphase and polyrhythmic coordination may thus to a large extent use common neural control circuitry. In a separate experiment, we analyzed the neural control of the rhythmic structure and the serial order of finger movements during polyrhythmic tapping. Polyrhythmic tapping was compared with an isochronous coordination pattern that retained the same serial order of finger movements as the polyrhythm. This experiment showed that the preSMA and the bilateral superior temporal gyri may be crucial for the rhythmic control of polyrhythmic tapping, while the cerebellum, the CMA, and the premotor cortices presumably are more involved in the ordinal control of the sequence of finger movements.




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