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Overlapping influences shape motor activity during hasty sensorimotor decisions

View ORCID ProfileGerard Derosiere, View ORCID ProfileDavid Thura, Paul Cisek, Julie Duque
doi: https://doi.org/10.1101/2021.08.06.455419
Gerard Derosiere
1Institute of Neuroscience, Laboratory of Neurophysiology, Université catholique de Louvain,Brussels, Belgium
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  • For correspondence: gerard.derosiere@uclouvain.be
David Thura
2Lyon Neuroscience Research Center – Impact team - Inserm U1028 – CNRS UMR5292 – Lyon 1 University, Bron, France
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Paul Cisek
3Department of Neuroscience, Université de Montréal, Montréal, QC H3T 1J4, Canada
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Julie Duque
1Institute of Neuroscience, Laboratory of Neurophysiology, Université catholique de Louvain,Brussels, Belgium
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Summary

Humans and other animals are able to adjust their speed-accuracy tradeoff (SAT) at will depending on the urge to act, favoring either cautious or hasty decision policies in different contexts. An emerging view is that SAT regulation relies on influences exerting broad changes on the motor system, tuning its activity up globally when hastiness is at premium. The present study aimed to test this hypothesis. Fifty subjects performed a task involving choices between left and right index fingers, in which incorrect choices led either to a high or to a low penalty in two contexts, inciting them to emphasize either cautious or hasty policies. We applied transcranial magnetic stimulation on multiple motor representations, eliciting motor evoked potentials (MEP) in nine finger and leg muscles. MEP amplitudes allowed us to probe activity changes in the corresponding finger and leg representations, while subjects were deliberating about which index to choose. Our data indicate that hastiness entails a broad amplification of motor activity, though this amplification was limited to the chosen side. On top of this effect, we identified a local suppression of motor activity, surrounding the chosen index representation. Hence, a decision policy favoring speed over accuracy appears to rely on overlapping processes producing a broad (but not global) amplification and a surround suppression of motor activity. The latter effect may help increasing the signal-to-noise ratio of the chosen representation, as supported by single-trial correlation analyses indicating a stronger differentiation of activity changes in finger representations in the hasty context.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted August 08, 2021.
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Overlapping influences shape motor activity during hasty sensorimotor decisions
Gerard Derosiere, David Thura, Paul Cisek, Julie Duque
bioRxiv 2021.08.06.455419; doi: https://doi.org/10.1101/2021.08.06.455419
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Overlapping influences shape motor activity during hasty sensorimotor decisions
Gerard Derosiere, David Thura, Paul Cisek, Julie Duque
bioRxiv 2021.08.06.455419; doi: https://doi.org/10.1101/2021.08.06.455419

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