Different motor imagery modes following brain damage
Different motor imagery modes following brain damage
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DOI：
10.1016/j.cortex.2009.08.002
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发表时间：
2010-09-10
期刊：
影响因子：
3.6
通讯作者：
Lacquaniti, Francesco
中科院分区：
文献类型：
--
作者：
Daprati, Elena;Nico, Daniele;Lacquaniti, Francesco
近年来，许多研究探讨了显性和隐性运动活动之间的关系（即，心理模拟）。已经提供了一致的证据支持这两种功能之间的密切相似性，特别是基于对健康参与者的行为和神经影像学研究。有趣的是，关于病理人群的文献仍然存在很大的争议。然而，清楚地了解心理模拟是否以及如何被明显的运动障碍所改变，远非一个推测性的问题，特别是考虑到人们对在运动康复中使用心理练习越来越感兴趣。在这里，我们探讨了是否一组认知技能，同时解决任务，隐含需要心理模拟的行动，或者是否替代策略可能会引起根据成像的实际运动能力。为此，我们招募了一组中风患者，他们选择性地影响右半球或左半球，导致严重程度不等的运动障碍。我们要求他们和一组年龄匹配的健康对照组执行一项模拟抓握任务，以及两项涉及惯用手判断的任务（分别在手上和手套上）。根据任务和有趣的是，成像仪运动能力的实际状态，发现患有左脑损伤和右脑损伤的患者的表现之间存在脱节。这一发现表明，运动想象可能包括独立于运动系统的实际状态的替代心理策略。我们讨论了这些心理操作是如何不同的运动障碍的影响，并考虑目前的神经康复理论研究结果的影响。(C)2009 Elsevier Srl. All rights reserved.
In recent years, many researches have explored the relationship between overt and covert motor activity (i.e., mental simulation). Consistent evidence has been provided in favour of close similarities between the two functions, particularly based on behavioural and neuroimaging studies on healthy participants. Interestingly, literature on the pathological population remains largely controversial. Yet, a clear understanding of whether and how mental simulation is modified by overt motor disorders is far from a speculative question, especially in view of the increasing interest for the use of mental practice in motor rehabilitation. Here, we explored whether a single set of cognitive skills is applied while solving tasks that implicitly require mental simulation of an action, or whether alternative strategies might be elicited according to the imager's actual motor capabilities. For this purpose, we recruited a group of patients who suffered from a stroke affecting selectively either the right or the left hemisphere, responsible for motor impairments ranging in severity. We required them, and a group of age-matched healthy controls, to perform a task of simulated grasping, and two tasks involving handedness judgments (on hands and gloves, respectively). Dissociations were found between the performances of patients suffering from left versus right brain damage, according to the task and, interestingly, the actual state of the imager's motor capabilities. This finding suggests that motor imagery might include alternative mental strategies that are independent from the actual state of the motor system. We discuss how these mental operations are differently affected by motor impairment, and consider the implications of the present theoretical finding for neurorehabilitation. (C) 2009 Elsevier Srl. All rights reserved.