采用 3 自由度机械臂获取和消除操作性疼痛相关回避行为。

Acquisition and extinction of operant pain-related avoidance behavior using a 3 degrees-of-freedom robotic arm.

机构信息

Research Group on Health Psychology, KU Leuven, Leuven, Belgium Center for Excellence Generalization on Research in Health and Psychopathology, KU Leuven, Leuven, Belgium Center for the Psychology of Learning and Experimental Psychopathology, KU Leuven, Leuven, Belgium Department of Clinical Psychological Science, Maastricht University, the Netherlands.

出版信息

Pain. 2016 May;157(5):1094-1104. doi: 10.1097/j.pain.0000000000000483.

Abstract

Ample empirical evidence endorses the role of associative learning in pain-related fear acquisition. Nevertheless, research typically focused on self-reported and psychophysiological measures of fear. Avoidance, which is overt behavior preventing the occurrence of an aversive (painful) stimulus, has been largely neglected so far. Therefore, we aimed to fill this gap and developed an operant conditioning procedure for pain-related avoidance behavior. Participants moved their arm to a target location using the HapticMaster (FCS Robotics; Moog Inc, East Aurora, New York), a 3 degrees-of-freedom, force-controlled robotic arm. Three movement trajectories led to the target location. If participants in the Experimental Group took the shortest/easiest trajectory, they always received a painful stimulus (T1 = 100% reinforcement; no resistance). If they deviated from this trajectory, the painful stimulus could be partly or totally prevented (T2 = 50% reinforcement; T3 = 0% reinforcement), but more effort was needed (T2 = moderate resistance and deviation; T3 = strongest resistance and largest deviation). The Yoked Group received the same reinforcement schedule irrespective of their own behavior. During the subsequent extinction phase, no painful stimuli were delivered. Self-reported pain-expectancy and pain-related fear were assessed, and avoidance behavior was operationalized as the maximal distance from the shortest trajectory. During acquisition, the Experimental Group reported more pain-related fear and pain-expectancy to T1 vs T2 vs T3 and deviated more from the shortest trajectory than the Yoked Group. During subsequent extinction, avoidance behavior, self-reported fear, and pain-expectancy decreased significantly, but conditioned differences persisted despite the absence of painful stimuli. To conclude, this operant learning task might provide a valid paradigm to study pain-related avoidance behavior in future studies.

摘要

大量经验证据证实了联想学习在疼痛相关恐惧形成中的作用。然而,研究通常集中在自我报告和心理生理学恐惧测量上。迄今为止,回避行为(防止厌恶(疼痛)刺激发生的明显行为)在很大程度上被忽视了。因此,我们旨在填补这一空白,并开发了一种与疼痛相关的回避行为操作性条件反射程序。参与者使用 HapticMaster(FCS Robotics;Moog Inc,东奥罗拉,纽约),一种 3 自由度、力控制的机械臂,将手臂移动到目标位置。有 3 条运动轨迹通向目标位置。如果实验组的参与者采取最短/最简单的轨迹,他们总是会受到疼痛刺激(T1=100%强化;无阻力)。如果他们偏离这条轨迹,疼痛刺激可以部分或完全避免(T2=50%强化;T3=0%强化),但需要更多的努力(T2=中等阻力和偏离;T3=最强阻力和最大偏离)。对照组无论自己的行为如何,都接受相同的强化计划。在随后的消退阶段,没有提供疼痛刺激。评估了自我报告的疼痛预期和与疼痛相关的恐惧,并且回避行为被定义为与最短轨迹的最大距离。在获得阶段,实验组报告的 T1 比 T2 比 T3 的与疼痛相关的恐惧和疼痛预期更多,并且比对照组更偏离最短轨迹。在随后的消退阶段,回避行为、自我报告的恐惧和疼痛预期显著下降,但尽管没有疼痛刺激,条件差异仍然存在。总之,这种操作性学习任务可能为未来研究中疼痛相关回避行为的研究提供有效的范例。

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