Upper rate limits for one-to-one auditory-motor coordination involving whole-body oscillation: A study of street dancers and non-dancers

The capacity for auditory-motor coordination (AMC) is shared by several species, among which humans are most flexible in coordinating with tempo changes. We investigated how humans lose this tempo flexibility at their upper rate limit, and the effect of skill level on this phenomenon. Seven skilled street dancers, including a world champion, and ten non-dancers were instructed to bend their knees according to a metronome beat in a standing position at eight constant beat frequencies (3.8-5 Hz). Although maximum frequency of movement during the task was 4.8 Hz in the non-dancers and 5.0 Hz in the dancers, the rate limit for AMC was 4.1 Hz in the non-dancers and 4.9 Hz in the dancers. These results suggest that the loss of AMC was not due to rate limit of movement execution, but rather due to a constraint on the AMC process. In addition, mediation analysis revealed that a kinematic bias (i.e., the extent of knee flexion during the task) causally affected the extent of phase wandering via ...听觉-运动协调（auditory-motor coordination, AMC）能力为多个物种所共有，其中人类在随节拍变化进行协调方面表现出最强的灵活性。本研究探讨了人类在自身最高速率极限下如何丧失这种节拍协调灵活性，以及技能水平对该现象的影响。研究招募7名熟练的街舞舞者（含一名世界冠军）与10名非舞者，要求受试者以站姿跟随节拍器的节拍完成屈膝动作，测试涵盖8档固定节拍频率（3.8~5 Hz）。实验结果显示，非舞者的最大动作频率为4.8 Hz，舞者为5.0 Hz；但听觉-运动协调的速率极限在非舞者中为4.1 Hz，舞者中则为4.9 Hz。上述结果表明，听觉-运动协调能力的丧失并非源于动作执行的速率极限，而是源于听觉-运动协调过程本身的约束。此外，中介分析显示，运动学偏差（即实验过程中的膝关节屈曲程度）通过……对相位偏移程度产生了因果影响。