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Instabilities during antiphase bimanual movements: are ipsilateral pathways involved?
journal contribution
posted on 2023-05-16, 14:11 authored by Kagerer, FA, Jeffery SummersJeffery Summers, Semjen, AThe spatial and temporal coupling between the hands is known to be very robust during movements which use homologous muscles (in-phase or symmetric movements). In contrast, movements using nonhomologous muscles (antiphase or asymmetric movements) are less stable and exhibit a tendency to undergo a phase transition to in-phase movements as movement frequency increases. The instability during antiphase movements has been modeled in terms of signal interference mediated by the ipsilateral corticospinal pathways. In this study we report that participants in whom distal ipsilateral motor-evoked potentials could be elicited with transcranial magnetic stimulation (TMS), exhibited higher variability during a bimanual circling task than participants whose ipsilateral pathways could not be transcranially activated. These results suggest that ipsilateral control of the limb affects the level of bimanual coupling, and may contribute to uncoupling phenomena observed during asymmetric coordination.
History
Publication title
Experimental Brain ResearchVolume
151Issue
4Pagination
489-500ISSN
0014-4819Department/School
School of Psychological SciencesPublisher
Springer-VerlagPlace of publication
GermanyRepository Status
- Restricted