Horváth János
HUN-REN Research Centre for Natural Sciences, Institute of Cognitive Neuroscience and Psychology, Budapest, Hungary.
Institute of Psychology, Károli Gáspár University of the Reformed Church in Hungary, Bécsi út 324., Budapest, 1037, Hungary.
Sci Rep. 2024 Aug 8;14(1):18407. doi: 10.1038/s41598-024-69444-x.
Most voluntary actions have only few goals, which provides considerable freedom in the selection of action parameters. Recent studies showed that task-irrelevant aspects of the task context influence the motor parameters of the actions in a way which seems to reflect the relative importance of these aspects within the underlying action representation. The present study investigated how the intensity of auditory action-effects affected force exertion patterns in a self-paced action production task. Participants applied force impulses with their index finger on a force-sensitive resistor every three seconds. In four separate conditions, force impulses elicited no sound, or elicited tones with 69, 59 or 49 dB intensity. The results showed that participants applied more force when tone intensity was lower, and when tones were absent. These force differences were also present in the first 60 ms following tone onset, implying that these reflected differences in motor planning. The results are compatible with the notion that actions are represented in terms of their sensory effects, which are weighted differently-presumably to maintain an optimal level of overall auditory and tactile stimulation in the present case. These results hint at the potential usefulness of motor parameters as readouts of action intentions.
大多数自主行为只有少数目标，这在行动参数的选择上提供了相当大的自由度。最近的研究表明，任务情境中与任务无关的方面会以一种似乎反映这些方面在潜在行动表征中相对重要性的方式影响行动的运动参数。本研究调查了听觉动作效应的强度如何在一个自定节奏的动作产生任务中影响用力模式。参与者每隔三秒用食指在一个力敏电阻上施加力脉冲。在四个不同的条件下，力脉冲不产生声音，或者产生强度为69、59或49分贝的音调。结果表明，当音调强度较低或没有音调时，参与者会施加更大的力。这些力的差异在音调开始后的前60毫秒也存在，这意味着这些差异反映了运动计划的不同。这些结果与这样一种观点相一致，即行为是根据其感觉效应来表征的，在当前情况下，感觉效应的权重不同——大概是为了保持整体听觉和触觉刺激的最佳水平。这些结果暗示了运动参数作为行动意图读数的潜在有用性。
