Summary
Cortical DC shifts preceding and accompanying the execution of five different bimanual motor tasks were analysed in 20 subjects. All tasks required repetitive flexions and extensions of the two forefingers for a period of at least six seconds. The temporal and spatial structures organization varied in the different tasks: (1) Simultaneous agonistic performance (forefinger flexion on both sides), (2) simultaneous antagonistic performance (e.g. flexion of the right, extension of the left forefinger), (3) sequential agonistic performance, (4) sequential antagonistic performance, (5) uncoordinated flexions and extensions of the two forefingers. Compared to (1) and (2), conditions (3) and (4) included a temporal delay between the performance of the two forefingers; compared to (1) and (3), conditions (2) and (4) required the subjects to perform movements of opposite directions with their two forefingers. Effects of the temporal factor (T; simultaneous vs. sequential) and the spatial factor (S; agonistic vs. antagonistic) on cortical DC shifts were investigated. The voluntary initiation of each motor task was preceded by a Bereitschaftspotential (BP). The performance of the complex tasks (1–4) was accompanied by a slow negative DC potential shift (N-P). In general, the BP did not differ depending on the temporal or spatial structures of the tasks (1–4). However, amplitudes of N-P (i.e. during tasks) were influenced by the temporal factor with significantly larger amplitudes in sequential than in simultaneous tasks. This difference was not a global phenomenon in all recordings but was selectively found in the recordings over the fronto-central midline. The spatial factor had no influence on N-P. It is suggested that the timing-dependent increase of N-P reflects greater activation of the fronto-central midline including the supplementary motor area (SMA) in sequential as compared to simultaneous movements. Furthermore, the data substantiate the hypothesis that the fronto-central midline (including the SMA) is rather involved in the temporal than the spatial coordination of bimanual motor tasks.
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Lang, W., Lang, M., Uhl, F. et al. Negative cortical DC shifts preceding and accompanying simultaneous and sequential finger movements. Exp Brain Res 71, 579–587 (1988). https://doi.org/10.1007/BF00248750
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DOI: https://doi.org/10.1007/BF00248750