Dual task interference in psychogenic tremor
Dual task interference in psychogenic tremor
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DOI：
10.1002/mds.21670
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发表时间：
2007-10-31
影响因子：
8.6
通讯作者：
Valls-Sole, Josep
中科院分区：
文献类型：
--
作者：
Kumru, Hatice;Begeman, Maaike;Valls-Sole, Josep
心因性震颤（PT）在视觉上无法与自发模仿的震颤区分。健康的志愿者很难同时执行两个任务，这是由于被称为双任务干扰的现象。因此，进行自主的有节奏的运动对于用对侧手进行快速的弹道运动来说将是一种负担。我们假设，与健康志愿者进行有节奏的运动类似，PT患者应该表现出双重任务干扰的影响，这可能会将他们与其他类型的震颤患者区分开来。我们研究了6例PT患者，9例帕金森病（PD）和主要是单侧震颤，11例原发性震颤（ET），和10例正常志愿者（NV）模仿震颤。他们被要求在两种不同的条件下执行单侧简单反应时任务（SRT）的视觉命令信号：在休息（rSRT）和对侧手震颤（tSRT）。PT组和NV组tSRT反应时间显著长于rSRT（P < 0.01）。然而，在PD和ET中，未观察到rSRT和tSRT之间的显著差异。单侧tSRT相对于rSRT的延迟表明震颤样振荡运动对反应时间的影响，这与NV或PT患者的双任务干扰概念一致，但与PD或ET无关。这些观察结果可能是有用的心因性运动障碍的评价。(C)2007年，《社会运动》创刊。
Psychogenic tremor (PT) is visually indistinguishable from voluntarily mimicked tremor. Healthy volunteers have difficulties with carrying out simultaneously two tasks due to the phenomenon known as dual task interference. Therefore, performing voluntary rhythmic movements would be a burden for carrying out fast ballistic movements with the contralateral hand. We hypothesized that, similarly to healthy volunteers performing rhythmic movements, patients with PT should show the effects of dual task interference, and this may distinguish them from patients with other types of tremor. We studied 6 patients with PT, 9 with Parkinson's disease (PD) and predominantly unilateral tremor, 11 with essential tremor (ET), and 10 normal volunteers (NV) mimicking tremor. They were requested to perform a unilateral simple reaction time task (SRT) to a visual imperative signal in two different conditions: at rest (rSRT) and during contralateral hand tremor (tSRT). Reaction time was significantly longer in tSRT than in rSRT in PT and in NV groups (P < 0.01 for both groups). However, no significant differences were observed between rSRT and tSRT in PD and ET. The delay of unilateral tSRT with respect to rSRT suggests an effect of tremorlike oscillatory movements on reaction time that is consistent with the concept of dual-task interference in NV or PT patients but not in PD or ET. These observations may be useful in the evaluation of psychogenic movement disorders. (C) 2007 Movement Disorder Society.