Taylor J L, McCloskey D I
School of Physiology and Pharmacology, University of New South Wales, Kensington, Sydney, Australia.
Exp Brain Res. 1988;70(2):351-60. doi: 10.1007/BF00248360.
Proprioception in the neck was investigated in normal human subjects. Three experiments studied rotation of the head about a vertical axis on the body. Accuracy of pointing, thresholds for detection of passive movement, and control of fine movement were tested. Comparison of the accuracy of pointing at the big toe with the nose and with the arm, showed a smaller scatter of angular misalignments when pointing with the arm. However, the arm pointed systematically off target. Pointing at the target toe by turning the head was not significantly more accurate than aligning the nose and toe by turning the chair and body with the head fixed. The highest threshold found for the detection of the direction of passive movement of the head relative to the body was 1.4 degrees angular displacement. Thresholds were highest at the slowest angular velocity and dropped as angular velocity increased. When the head was turned on the body thresholds were lower than when the body was turned and the head held still. Control of fine angular movements of the head and of the distal phalanx of the right thumb were compared by measuring subjects' accuracy in guiding a cursor through a path on a computer screen by turning the head or moving the thumb. The thumb was found to be better controlled than the head.
对正常人体受试者颈部的本体感觉进行了研究。三个实验研究了头部在身体上绕垂直轴的旋转。测试了指向准确性、被动运动检测阈值以及精细运动控制。比较用手臂指向大脚趾与指向鼻子以及指向手臂时的准确性，结果显示用手臂指向时角度偏差的离散度较小。然而，手臂指向存在系统性的偏离目标情况。通过转动头部指向目标脚趾并不比在头部固定的情况下转动椅子和身体使鼻子与脚趾对齐更准确。检测头部相对于身体被动运动方向的最高阈值为1.4度角位移。阈值在角速度最慢时最高，并随着角速度增加而下降。当头部在身体上转动时阈值低于身体转动而头部保持静止时的阈值。通过测量受试者转动头部或移动拇指引导光标在计算机屏幕上的路径时的准确性，比较了头部和右手拇指远节指骨的精细角运动控制。结果发现拇指比头部控制得更好。
