Kuehn Esther, De Havas Jack, Silkoset Emilie, Gomi Hiroaki, Haggard Patrick
Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstr. 1a, 04103, Leipzig, Germany,
Exp Brain Res. 2015 Apr;233(4):1273-88. doi: 10.1007/s00221-015-4205-0. Epub 2015 Jan 25.
Proprioception can be defined as the sense for body movement and position. While most sensory information can be successfully integrated across hemispheres, little is known about the bilateral integration of proprioceptive information. In two behavioural experiments, we investigated whether estimates of the position of one hand are influenced by simultaneous proprioceptive information from the other hand. We further investigated whether such putative bimanual proprioceptive integration would differ between expert dancers and non-dancer controls. Either one hand or both hands were passively moved to novel positions, and participants indicated the perceived location of the index finger tip of the designated target hand, by orienting a visible laser beam mounted on a cap. Synchronized bimanual movements compared to unimanual movements significantly improved proprioceptive position sense. In particular, we found a bias reduction to perceive the target hand's index finger tip as shifted away from the midline in the bimanual condition, compared to the unimanual condition. Expert dancers, in contrast, did not show this change in proprioceptive position sense after bimanual movements. We suggest that bimanual movements may improve proprioception due to interhemispheric integration in controls, but not in expert dancers.
本体感觉可被定义为对身体运动和位置的感知。虽然大多数感觉信息能够成功地在两个脑半球之间整合，但关于本体感觉信息的双侧整合却知之甚少。在两项行为实验中，我们研究了一只手的位置估计是否会受到来自另一只手的同时性本体感觉信息的影响。我们还进一步研究了这种假定的双手本体感觉整合在专业舞者和非舞者对照组之间是否会有所不同。将一只手或双手被动地移动到新的位置，参与者通过调整安装在帽子上的可见激光束，来指示指定目标手食指指尖的感知位置。与单手运动相比，同步双手运动显著改善了本体感觉位置感。特别是，我们发现与单手条件相比，在双手条件下，将目标手食指指尖感知为偏离中线的偏差有所减少。相比之下，专业舞者在双手运动后并未表现出这种本体感觉位置感的变化。我们认为，双手运动可能由于对照组中的半球间整合而改善本体感觉，但在专业舞者中并非如此。
