Alekhina Maria, Perkic Goran, Manson Gerome Aleandro, Blouin Jean, Tremblay Luc
Faculty of Kinesiology & Physical Education, University of Toronto, 55 Harbord Street, Toronto, ON M5S 2W6, Canada.
School of Kinesiology and Health Studies, Queens University, 28 Division Street, Kingston, ON K7L 3N6, Canada.
Brain Sci. 2023 Oct 1;13(10):1407. doi: 10.3390/brainsci13101407.
When preparing and executing goal-directed actions, neck proprioceptive information is critical to determining the relative positions of the body and target in space. While the contribution of neck proprioception for upper-limb movements has been previously investigated, we could not find evidence discerning its impact on the planning vs. online control of upper-limb trajectories. To investigate these distinct sensorimotor processes, participants performed discrete reaches towards a virtual target. On some trials, neck vibration was randomly applied before and/or during the movement, or not at all. The main dependent variable was the medio-lateral/directional bias of the reaching finger. The neck vibration conditions induced early leftward trajectory biases in some participants and late rightward trajectory biases in others. These different patterns of trajectory biases were explained by individual differences in the use of body-centered and head-centered frames of reference. Importantly, the current study provides direct evidence that sensory cues from the neck muscles contribute to the online control of goal-directed arm movements, likely accompanied by significant individual differences.
在准备和执行目标导向动作时，颈部本体感觉信息对于确定身体和目标在空间中的相对位置至关重要。虽然之前已经研究过颈部本体感觉对上肢运动的贡献，但我们未能找到证据来区分其对上肢轨迹规划与在线控制的影响。为了研究这些不同的感觉运动过程，参与者对虚拟目标进行离散伸手动作。在一些试验中，在运动前和/或运动过程中随机施加颈部振动，或者根本不施加。主要因变量是伸手手指的中外侧/方向偏差。颈部振动条件在一些参与者中诱发了早期向左的轨迹偏差，而在另一些参与者中诱发了晚期向右的轨迹偏差。这些不同的轨迹偏差模式可以通过个体在使用以身体为中心和以头部为中心的参考系方面的差异来解释。重要的是，当前研究提供了直接证据，表明来自颈部肌肉的感觉线索有助于目标导向手臂运动的在线控制，可能伴随着显著的个体差异。
