Summa Susanna, Tamagnone Irene, Asprea Giulia, Capurro Clelia, Sanguineti Vittorio
Annu Int Conf IEEE Eng Med Biol Soc. 2015;2015:238-41. doi: 10.1109/EMBC.2015.7318344.
It is commonly acknowledged that movement performance is determined by a trade-off between accuracy requirements and energetic expenditure. However, their relative weights are subjective and depend on the perceived benefit (or cost) associated to successful movement completion. A deeper knowledge on how this trade-off affects motor behavior may suggest ways to manipulate it in pathologies, like Parkinson's disease, in which the mechanisms underlying the selection of motor response are believed to be defective. In this preliminary study, we associate a monetary incentive to successful completion of a full-body reaching task and look at the determinants of motor performance. Our preliminary results suggest that motor performance (measured as the absolute average acceleration of hand movements) increases with movement amplitude/target elevation. Overall, performance also increases with the amount of monetary incentive and with the average reward experienced in previous trials. In addition, subjects with a greater sensitivity to incentive exhibit a low sensitivity to the average reward. In contrast, subjects with a negative sensitivity to incentive exhibit a smaller sensitivity to the average reward. These results suggest that motor performance has a complex relation with its perceived benefits, and this relation is probably subject-dependent.
人们普遍认为，运动表现是由准确性要求和能量消耗之间的权衡决定的。然而，它们的相对权重是主观的，并且取决于与成功完成运动相关的感知收益（或成本）。对这种权衡如何影响运动行为的更深入了解，可能会为在帕金森病等病理状态下对其进行调控提供思路，在帕金森病中，运动反应选择的潜在机制被认为存在缺陷。在这项初步研究中，我们将货币奖励与成功完成全身伸手任务相关联，并研究运动表现的决定因素。我们的初步结果表明，运动表现（以手部运动的绝对平均加速度衡量）随着运动幅度/目标高度的增加而提高。总体而言，表现也随着货币奖励的数量以及先前试验中获得的平均奖励而增加。此外，对奖励敏感度较高的受试者对平均奖励的敏感度较低。相反，对奖励敏感度为负的受试者对平均奖励的敏感度较小。这些结果表明，运动表现与其感知收益之间存在复杂的关系，并且这种关系可能因个体而异。
