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    Monetary incentives improve full-body reaching task performance by increasing movement acceleration. Individual responses vary based on sensitivity to rewards and prior experience, highlighting subjective influences on motor control.

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    Area of Science:

    • Motor Control and Movement Science
    • Behavioral Economics
    • Neuroscience

    Background:

    • Movement performance involves a trade-off between accuracy and energy expenditure, influenced by perceived benefits.
    • Understanding this trade-off can inform interventions for motor disorders like Parkinson's disease.
    • Defective motor response selection mechanisms are implicated in Parkinson's disease.

    Purpose of the Study:

    • To investigate how monetary incentives affect motor performance in a full-body reaching task.
    • To explore the determinants of motor performance, including movement amplitude and reward history.
    • To examine individual differences in sensitivity to incentives and average rewards.

    Main Methods:

    • Participants performed a full-body reaching task with monetary incentives for successful completion.
    • Motor performance was quantified by measuring the absolute average acceleration of hand movements.
    • Subject sensitivity to incentive magnitude and average reward was analyzed.

    Main Results:

    • Motor performance, measured by acceleration, increased with movement amplitude and target elevation.
    • Performance improved with higher monetary incentives and greater average rewards from previous trials.
    • Individuals highly sensitive to incentives showed low sensitivity to average rewards, and vice versa.

    Conclusions:

    • Motor performance is complexly related to perceived benefits, with significant subject-dependent variations.
    • Monetary incentives and reward history dynamically modulate motor control strategies.
    • Individual differences in reward sensitivity play a crucial role in motor behavior modulation.