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先前的经验和当前的目标会影响肌梭与触觉的整合。

Prior experience and current goals affect muscle-spindle and tactile integration.

作者信息

Rabin Ely, Gordon Andrew M

机构信息

Department of Biobehavioral Sciences, Teachers College, Columbia University, 525 West 120th Street, P.O. Box 199, New York, NY 10027, USA.

出版信息

Exp Brain Res. 2006 Mar;169(3):407-16. doi: 10.1007/s00221-005-0154-3. Epub 2005 Dec 6.

Abstract

We previously have shown that reports of illusory elbow extension from biceps vibration can be attenuated by touching a stationary cue-surface with the index fingertip of a vibrated arm. However, this was not the case if the subject had previously felt genuine motion of the cue-surface without biceps vibration. Two potential explanations for this are that the sense of elbow orientation results from tactile and muscle stretch cues that are integrated based on (1) an awareness of the tactile cue's mobility or (2) specific patterns of tactile and muscle spindle activity resembling the elbow motion during previous interactions with the tactile cue. We tested these hypotheses by comparing how touching the cue-surface attenuated the reports of arm movement during biceps vibration after a demonstration of the cue- surface mobility without involving any elbow motion versus simultaneously touching the cue-surface as it moved and extending the elbow to correspond exactly to the elbow extension illusion during vibration. Touching the cue-surface stopped attenuating the reports of elbow extension during biceps vibration only after experiencing actual cue-surface motion while moving the elbow . This supports the second hypothesis that tactile and muscle stretch feedback that are integrated based on specific patterns of tactile and muscle spindle activity recalled from previous interactions with the tactile cue. We also tested the influence of motor set on the sense of elbow position in this paradigm. We found that even after touching the stationary cue-surface had ceased to attenuate illusory elbow motion during biceps vibration, illusory elbow motion during vibration still could be attenuated. This was possible if the subjects intended to actively use their wrists rather than the elbow to maintain fingertip contact. We conclude that muscle stretch and tactile cues are integrated to locate the arm within a highly specific context associated with tactile and proprioceptive feedback from prior experience and current movement goals.

摘要

我们之前已经表明,通过用振动手臂的食指触摸静止的提示表面,可以减弱肱二头肌振动引起的虚幻肘部伸展报告。然而,如果受试者之前在没有肱二头肌振动的情况下感受到了提示表面的真实运动,情况就并非如此。对此有两种可能的解释:肘部方位感源于触觉和肌肉拉伸线索,这些线索基于(1)对触觉线索可移动性的认知或(2)在之前与触觉线索交互过程中类似于肘部运动的特定触觉和肌梭活动模式进行整合。我们通过比较在展示提示表面的可移动性但不涉及任何肘部运动后,触摸提示表面如何减弱肱二头肌振动期间的手臂运动报告,与在提示表面移动时同时触摸并伸展肘部以精确对应振动期间的肘部伸展错觉,来检验这些假设。只有在移动肘部时体验到实际的提示表面运动后,触摸提示表面才会停止减弱肱二头肌振动期间的肘部伸展报告。这支持了第二个假设,即触觉和肌肉拉伸反馈是基于从之前与触觉线索的交互中回忆起的特定触觉和肌梭活动模式进行整合的。我们还在这个范式中测试了运动定势对肘部位置感的影响。我们发现,即使在触摸静止的提示表面不再减弱肱二头肌振动期间的虚幻肘部运动后,振动期间的虚幻肘部运动仍然可以减弱。如果受试者有意积极使用手腕而不是肘部来保持指尖接触,这是可能的。我们得出结论,肌肉拉伸和触觉线索在与先前经验和当前运动目标的触觉和本体感觉反馈相关的高度特定背景下进行整合,以定位手臂。

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