Chen Yifei, Abram Sabrina J, Ivry Richard B, Tsay Jonathan S
Department of Psychology, University of California, Berkeley.
Helen Wills Neuroscience Institute, University of California, Berkeley.
bioRxiv. 2024 Jul 1:2024.06.28.601293. doi: 10.1101/2024.06.28.601293.
Motor adaptation - the process of reducing motor errors through feedback and practice - is an essential feature of human competence, allowing us to move accurately in dynamic and novel environments. Adaptation typically results from sensory feedback, with most learning driven by visual and proprioceptive feedback that arises with the movement. In humans, motor adaptation can also be driven by symbolic feedback. In the present study, we examine how implicit and explicit components of motor adaptation are modulated by symbolic feedback. We conducted three reaching experiments involving over 400 human participants to compare sensory and symbolic feedback using a task in which both types of learning processes could be operative (Experiment 1) or tasks in which learning was expected to be limited to only an explicit process (Experiments 2 and 3). Adaptation with symbolic feedback was dominated by explicit strategy use, with minimal evidence of implicit recalibration. Even when matched in terms of information content, adaptation to rotational and mirror reversal perturbations was slower in response to symbolic feedback compared to sensory feedback. Our results suggest that the abstract and indirect nature of symbolic feedback disrupts strategic reasoning and/or refinement, deepening our understanding of how feedback type influences the mechanisms of sensorimotor learning.
运动适应——通过反馈和练习减少运动误差的过程——是人类能力的一个基本特征,使我们能够在动态和陌生的环境中精确移动。适应通常源于感觉反馈,大多数学习是由运动时产生的视觉和本体感觉反馈驱动的。在人类中,运动适应也可以由符号反馈驱动。在本研究中,我们研究了运动适应的内隐和外显成分是如何被符号反馈调节的。我们进行了三项涉及400多名人类参与者的伸手实验,使用一个两种学习过程都可能起作用的任务(实验1)或预期学习仅限于外显过程的任务(实验2和3)来比较感觉反馈和符号反馈。符号反馈的适应以外显策略的使用为主,几乎没有内隐重新校准的证据。即使在信息内容方面相匹配,与感觉反馈相比,对旋转和镜像反转扰动的适应在符号反馈下的反应也较慢。我们的结果表明,符号反馈的抽象性和间接性会干扰策略推理和/或优化,加深了我们对反馈类型如何影响感觉运动学习机制的理解。