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首页> 外文期刊>Brain research >Involvement of human left frontoparietal cortices in neural processes associated with task-switching between two sequences of skilled finger movements
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Involvement of human left frontoparietal cortices in neural processes associated with task-switching between two sequences of skilled finger movements

机译：人类左前进皮质在两个熟练手指运动序列之间的任务切换相关的神经过程中的参与

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摘要

In this study, we demonstrate the involvement of left frontoparietal cortices in neural processes for task-switching between skilled movements. Functional magnetic resonance imaging was conducted while thirty-two right-handed healthy participants performed two sequential finger-movement tasks with their left hands. One group (n = 16) trained these tasks through random-practice (tasks were either switched or repeated trial by trial) on one day and blocked-practice (successive intensive practice of each task) on the next day, while the remaining participants practiced in the reverse order. On the first day, performance of both tasks improved in all participants, suggesting that the two skilful tasks can be learned in both practice schedules. However, during the random-practice, the performance in the switched trials initially deteriorated and gradually approached to that in the repeated trials as the practice proceeded. The left (mainly inferior) frontoparietal cortices showed greater preparatory activity for the switched trials compared with the repeated trials in a left-hemispheric dominant manner, and the left intraparietal activity decreased as the performance of the switched trials improved. The results indicate that neural processes for task-switching are associated with the greater preparatory activity in the left inferior frontoparietal cortices, and the efficient switching may proceed concomitantly with the left intraparietal activity reduction.
机译：在这项研究中，我们展示了左前线皮质在熟练运动之间的任务切换中的神经过程中的参与。进行功能磁共振成像，而三十二次右手健康的参与者用左手执行了两个连续的手指运动任务。一组（n = 16）通过随机练习培训了这些任务（任务是在一天内审判和通过试验转换或反复审判）第二天被阻止实践（每项任务的连续实践），而其余的参与者实践以相反的顺序。在第一天，所有参与者的任务的性能都有所改善，这表明两个熟练的任务都可以在两种实践时间表中学习。然而，在随机实践期间，随着实践的实施方法，转换试验中的性能最初恶化并逐渐接近重复试验中。左（主要是劣质）前迁移型术语对切换试验的预备活性更大，而与左半球的主要方法的重复试验相比，随着切换试验的性能改善，左侧活度降低。结果表明，任务切换的神经过程与左下常初级皮质中的更高的预备活性相关，并且有效的切换可以伴随左脑内活性降低。

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