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Poster De Conférence Année : 2022

From motivation to action: action utility better predicts changes in pre-movement beta-band activity than movement speed

Résumé

The amplitude of beta-band activity (13-30 Hz; β) from motor regions has been associated with motor parameters such as velocity. This view comes mainly from studies of Parkinson’s disease, in which dopamine depletion is accompanied by an increase in β, correlated with the severity of bradykinesia. However, the existence of a linear association between β and movement velocity is still debated. An alternative explanation is that β reflects the action valuation process, as dopamine is indeed thought to encode action utility, which in turn influences movement velocity. Consequently, the objective of the present study was to dissociate the velocity and utility of a movement, and test their respective influence on β. 31 healthy right-handed participants were asked to reach a target with a peak velocity comprised in a specific range while EEG was recorded. The required velocity was indicated by a gauge: the higher the filling of the gauge, the faster the movement had to be performed, with maximal filling corresponding to the maximal velocity participants could reach. The target could be located at two different positions, so that the maximal peak velocity to reach each target was significantly different. This difference was leveraged to define conditions in which the velocity required to reach the two targets was identical but the relative effort different (i.e., gauges differently filled) and vice-versa. We hypothesized that if β reflects action utility rather than velocity, β should be similar for a given gauge’s filling across the two targets, in spite of different velocities. Results showed a significant effect of the gauge’s filling, but not of the presented target on β. Furthermore, β did not vary linearly with the level of the gauge as it was significantly decreased both for high and low fillings as compared to a medium filling. Probability density functions of peak velocities revealed that the most chosen velocities were on average closer to the ones required at a medium filling. These preferences were used to model action utility as a function of peak velocity for each target. Modulations of action utility across conditions approximated the ones found in β, and linear mixed effect modeling revealed that action utility but not peak velocity significantly predicted variations of β. These results show that modulations of β with movement velocity are better explained by changes in action utility rather than velocity per se. In addition to supporting the association between β and dopaminergic activity, these results bring up the intriguing perspective that manipulating β may influence motor motivation and thus effort exertion.
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Dates et versions

hal-04134433 , version 1 (20-06-2023)

Identifiants

  • HAL Id : hal-04134433 , version 1

Citer

Emeline Pierrieau, Bastien Berret, Jean-Francois Lepage, Pierre-Michel Bernier. From motivation to action: action utility better predicts changes in pre-movement beta-band activity than movement speed. Neuroscience 2022, Nov 2022, San Diego (California), United States. ⟨hal-04134433⟩
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