Neural Adaptations to Ineffective Motor Practice: Implications for Futile Labor

背景和目的：本研究探討超高難度的手眼作業導致無效學習的神經適應性改變。方法：12位健康受試者執行施力按壓任務，以瞬間施力耦合電腦螢幕顯示之類隨機移動目標物。實驗記錄手指施力按壓準確度與腦電波事件相關電位，並分析準備期時的腦電波事件相關電位與功能性網路連結特徵。結果：經練習後，受試者手指按壓錯誤量雖無顯著的降低，但事件相關電位與大腦功能性網路連結有明顯的改變。C_z, FC_z, F_z, 以及FC_3 等區域N1負成分於練習後呈現下降趨勢。練習後在前額葉－動作－頂葉－枕葉區域間的P2正成分更為增強。在較高網路閾值情形下，後測有較低的特徵路徑長度以及較高的叢集相關性，但小世界指數在學習前後並未有較明顯的變化。結論：本實驗的結果清楚地顯示：無效的訓練過程會傾向產生弱鍵結的大腦神經網路，且不具有功能性組織的特性，而過度困難的動作訓練，將導致大腦系統衍伸出不成熟的動作規劃程序。

關鍵字

腦電波；事件相關電位；動作學習；學習任務困難度；圖型分析

並列摘要

Background and purpose: This work investigated neural evidences for ineffective learning of an extremely difficult visuomotor task. Methods: Twelve adults were assigned to practice a designated force-matching task by coupling peak grip force to a quasi-random visual target. Force-matching accuracy and event-related evoked potentials (ERP) were monitored. In addition, functional network metrics of scalp EEG in the preparatory stage were assessed. Results: Force-matching practice did not bring about significant reduction in force-matching error. Despite an insignificant training benefit, the ERP characteristics and brain network metrics changed with practice. N1 in C_z, FC_z, F_z, and FC_3 was less negative and P2 positivity in the fronto-motor-parietal-occipital networks was enhanced in the post-test. The post-test exhibited lower characteristic path lengths and higher cluster coefficient at higher thresholds than the pre-test did, although the small-worldness index remained relatively invariant after training. Conclusion: Our results clearly revealed that ineffective training concurs with weakly-connected brain network that was not functionally organized, suggestive of an immature process of motor planning due to excessive task difficulty.

並列關鍵字

EEG ； Event-related evoked potentials ； Motor learning ； Task difficulty ； Graph analysis

國際替代計量

Neural Adaptations to Ineffective Motor Practice: Implications for Futile Labor

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