Abstract
A growing body of evidence suggests that the mode of movement selection is relevant for the readiness potential, namely, internal (or free) selection of movements is associated with increased readiness potential amplitudes compared to predetermined or externally guided selection. It is little acknowledged, however, that this finding may be ascribed to the different expression of volition (i.e., conscious experience of choice) rather than to the mode of movement selection per se. To probe this issue, we conducted two experiments: in Experiment 1, a mental task was employed to distract sixteen volunteers from the selection and performance of incidental movements, which consisted of pressing one of two buttons according to either free or externally guided modes of movement selection; in Experiment 2, another sixteen individuals performed the same motor task, however, they were encouraged to attend to their intention to act. As result, the increased readiness potential amplitude before freely selected movements was found exclusively in Experiment 2. More detailed analysis suggested that the attention to the initiation of movements was associated with greater readiness potential in its medial and late portion, while the attention to the movement selection, with more global increase of the component. The study suggests that much of the higher demands on motor preparatory activities ascribed to the internal selection of movements in previous studies actually depends on individual’s attention and, thus, probably corresponds to volitional processes.
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The authors declare that they have no conflict of interest. S.T. was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001—and C.Y.O was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP).
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Takashima, S., Ogawa, C.Y., Najman, F.A. et al. The volition, the mode of movement selection and the readiness potential. Exp Brain Res 238, 2113–2123 (2020). https://doi.org/10.1007/s00221-020-05878-9
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DOI: https://doi.org/10.1007/s00221-020-05878-9