Arikan Belkis Ezgi, Voudouris Dimitris, Straube Benjamin, Fiehler Katja
Department of Experimental Psychology, Justus Liebig University Giessen, Otto-Behaghel Strasse 10F, Philosophikum I, 35394 Giessen, Germany.
Center for Mind, Brain and Behavior (CMBB) of the University of Marburg, Justus Liebig University Giessen and University of Darmstadt, Hans-Meerwein-Strasse 6, 35032 Marburg, Germany.
iScience. 2024 Jul 25;27(8):110582. doi: 10.1016/j.isci.2024.110582. eCollection 2024 Aug 16.
Tactile sensitivity on a limb is reduced during movement. This tactile suppression results presumably from central predictive mechanisms that downregulate sensations caused during voluntary action. Suppression also occurs during passive movements, indicating a role for peripheral mechanisms, questioning the predictive nature of suppression. Yet, predictions existing beyond the motor domain (non-motor predictions) can also modulate tactile suppression. This study aimed to disentangle central motor predictive and peripheral feedback mechanisms while accounting for non-motor predictions. Participants detected tactile stimuli on their limb shortly before it moved in an active or passive manner. Passive movements were either fully (100%) or partially (50%) predictable. We found tactile suppression during both active and passive movements irrespective of whether the passive movements were predictable. Importantly, tactile suppression was stronger in active than passive movements highlighting the specific role of central predictive mechanisms.
肢体在运动过程中触觉敏感性会降低。这种触觉抑制可能是由中枢预测机制导致的，该机制会下调自愿行动期间产生的感觉。在被动运动期间也会出现抑制现象，这表明外周机制发挥了作用，这对抑制的预测性质提出了质疑。然而，运动领域之外存在的预测（非运动预测）也可以调节触觉抑制。本研究旨在厘清中枢运动预测和外周反馈机制，同时考虑非运动预测。参与者在其肢体以主动或被动方式移动前不久检测到肢体上的触觉刺激。被动运动要么是完全（100%）可预测的，要么是部分（50%）可预测的。我们发现在主动和被动运动期间均存在触觉抑制，无论被动运动是否可预测。重要的是，主动运动中的触觉抑制比被动运动更强，突出了中枢预测机制的特定作用。
