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Vigor of self-paced arm reaching movements: inter-individual differences and the cost of time theory| old_uid | 16906 |
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| title | Vigor of self-paced arm reaching movements: inter-individual differences and the cost of time theory |
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| start_date | 2018/12/11 |
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| schedule | 15h-16h30 |
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| online | no |
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| summary | In daily life we often move at a preferred pace, thereby choosing certain relationships between amplitude, speed or duration, i.e. movement vigor. Yet, the principles underlying the formation of movement vigor remain unclear. If basal ganglia dysfunction clearly affects movement vigor, relatively large inter-individual differences have also been reported amongst healthy subjects performing various motor tasks such as saccades, walking or reaching. Biomechanics (e.g. anthropometry) likely contributes to inter-individual differences but recently a “cost of time” theory has been proposed to be the cornerstone of such differences in movement invigoration. It assumes that the brain puts a cost on time during the neural control of movement. In this talk, I will review earlier theories that have been proposed to account for the vigor of human movement and motivate the cost of time theory as a normative means to predict the vigor of self-paced arm movements. The proposed theory can account for the formation of movement vigor as well as for inter-individual differences beyond simple biomechanical discrepancies. The consistency of the cost of time across modeling choices, tasks or repeated measurements will then be explored. Its role in explaining other phenomena such as Fitts’ law will be addressed and future works to characterize its origin will be devised. Overall, vigor is a central (but still intriguing) aspect of human motor behavior that seems to require a multidisciplinary approach lying at the interface of mathematics, biomechanics, neurophysiology and psychology, to be better understood. |
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| responsibles | Fenouil |
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