Ross Jessica M, Warlaumont Anne S, Abney Drew H, Rigoli Lillian M, Balasubramaniam Ramesh
Department of Cognitive and Information Sciences, University of California, Merced.
J Exp Psychol Hum Percept Perform. 2016 Mar;42(3):308-19. doi: 10.1037/xhp0000198. Epub 2016 Jan 4.
Timescales of postural fluctuation reflect underlying neuromuscular processes in balance control that are influenced by sensory information and the performance of concurrent cognitive and motor tasks. An open question is how postural fluctuations entrain to complex environmental rhythms, such as in music, which also vary on multiple timescales. Musical groove describes the property of music that encourages auditory-motor synchronization and is used to study voluntary motor entrainment to rhythmic sounds. The influence of groove on balance control mechanisms remains unexplored. We recorded fluctuations in center of pressure (CoP) of standing participants (N = 40) listening to low and high groove music and during quiet stance. We found an effect of musical groove on radial sway variability, with the least amount of variability in the high groove condition. In addition, we observed that groove influenced postural sway entrainment at various temporal scales. For example, with increasing levels of groove, we observed more entrainment to shorter, local timescale rhythmic musical occurrences. In contrast, we observed more entrainment to longer, global timescale features of the music, such as periodicity, with decreasing levels of groove. Finally, musical experience influenced the amount of postural variability and entrainment at local and global timescales. We conclude that groove in music and musical experience can influence the neural mechanisms that govern balance control, and discuss implications of our findings in terms of multiscale sensorimotor coupling. (PsycINFO Database Record
姿势波动的时间尺度反映了平衡控制中潜在的神经肌肉过程，这些过程受感觉信息以及同时进行的认知和运动任务表现的影响。一个悬而未决的问题是姿势波动如何与复杂的环境节奏同步，比如音乐中的节奏，音乐节奏也在多个时间尺度上变化。音乐律动感描述了音乐中促进听觉 - 运动同步的特性，并被用于研究对有节奏声音的自主运动同步。律动感对平衡控制机制的影响仍未被探索。我们记录了站立参与者（N = 40）在听高律动感和低律动感音乐以及安静站立时的压力中心（CoP）波动情况。我们发现音乐律动感对径向摆动变异性有影响，在高律动感条件下变异性最小。此外，我们观察到律动感在不同时间尺度上影响姿势摆动同步。例如，随着律动感水平的增加，我们观察到对更短、局部时间尺度的有节奏音乐事件的同步更多。相反，随着律动感水平的降低，我们观察到对音乐更长、全局时间尺度特征（如周期性）的同步更多。最后，音乐体验影响了局部和全局时间尺度上的姿势变异性和同步程度。我们得出结论，音乐中的律动感和音乐体验可以影响控制平衡的神经机制，并从多尺度感觉运动耦合的角度讨论了我们研究结果的意义。（PsycINFO数据库记录）
