The seemingly straightforward task of tying one’s shoes requires a sophisticated interplay of joints, muscles, and neural pathways, posing a formidable challenge for researchers studying the intricacies of coordination. A widely accepted framework for measuring coordinated behavior is the Haken–Kelso–Bunz (HKB) model. However, a significant limitation of this model is its lack of accounting for the diverse variability structures inherent in the coordinated systems it frequently models. Variability is a pervasive phenomenon across various biological and physical systems, and it changes in healthy adults, older adults, and pathological populations. Here, we show, both empirically and with simulations, that manipulating the variability in coordinated movements significantly impacts the ability to change coordination patterns—a fundamental feature of the HKB model. Our results demonstrate that synchronized bimanual coordination, mirroring a state of healthy variability, instigates earlier transitions of coordinated movements compared to other variability conditions. This suggests a heightened adaptability when movements possess a healthy variability. We anticipate our study to show the necessity of adapting the HKB model to encompass variability, particularly in predictive applications such as neuroimaging, cognition, skill development, biomechanics, and beyond.

中文翻译：

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粉红噪声促进双手协调过程中更快的状态转换


系鞋带这个看似简单的任务需要关节、肌肉和神经通路之间复杂的相互作用，这对研究复杂的协调性的研究人员提出了巨大的挑战。 Haken-Kelso-Bunz (HKB) 模型是一个被广泛接受的衡量协调行为的框架。然而，该模型的一个显着局限性是它没有考虑到它经常建模的协调系统中固有的各种可变性结构。变异性是各种生物和物理系统中普遍存在的现象，在健康成年人、老年人和病态人群中都会发生变化。在这里，我们通过经验和模拟表明，操纵协调运动的可变性会显着影响改变协调模式的能力，这是 HKB 模型的基本特征。我们的结果表明，与其他可变性条件相比，同步双手协调反映了健康可变性的状态，可以更早地促进协调运​​动的转变。这表明当运动具有健康的可变性时，适应性就会增强。我们预计我们的研究将表明调整 HKB 模型以涵盖可变性的必要性，特别是在神经影像、认知、技能发展、生物力学等预测应用中。