Analysis of regulata of Jaw Motor System in Man

为探讨人类下颌运动系统的运动规律，对声信号控制下的下颌敲击运动和偏颌位持续自主紧咬条件化后的运动进行了运动学分析，结果如下：（1）在1.3Hz恒频信号控制下的重复颚式攻丝运动中，到第14或15次试验时，运动的早期学习过程将几乎完成，随后是习惯化。(2)敲击动作的大幅度调整应通过“后续操作控制”和“即时操作控制”来完成，前者是利用过去实验中获得的分散信息，后者是利用与当前实验有关的传出复制和转向传入信号。(3)这两种类型的性能控制应该是必不可少的，以完成任务，以较少的消耗电机能量。(4)在具有0.3、0.8、1.3、1.8、2.3和2.8 Hz恒定频率的重复命令信号中，0.3 Hz的信号似乎最适合于评价习惯化。(5)随机间隔重复信号控制下的下颌敲击运动，早期学习过程较少。(6)通过在偏心位置持续最大自主握紧30秒进行调节后，敲击点偏离调节侧，但在后缩位置进行调节除外。(7)这种调节作用在30次连续敲击的第一次或第二次试验中似乎很明显。“此外，如果在条件反射过程中咬合接触侧与下颌偏斜侧重合，则效果会增强。(8)上述结果为评价咀嚼运动系统的运动规律提供了基础数据。

In order to evaluate the regulata of jaw motor system in man, jaw tapping movement commanded by accoustic signal and the movement after conditioning by sustained voluntary clenching in eccentric jaw position were kinesiologically analyzed.The results obtained were as follows;(1) In Repetitive jaw tapping movenent commanded by signal of constant frequency of 1.3 Hz, an early learning proces of the movement would be almost accomplished by the time of the 14th or 15th trial, following by a habituation.(2) The large extent of adjustment of tapping movement-should be done by "a subsequent performance control" in which straged informations obtained from the past trial would be perticipated, and by "an instant performance control" in which efferent copy and peturning afferent signal concerned with the present trial would be contributed.(3) These two types of performance control should be essential to accomplish the task with iess consumption of motor enerby.(4) Among the repetitive command signals with 0.3, 0.8, 1.3, 1.8, 2.3 and 2.8 Hz constant frequencies, the signal of 0.3 Hz seemed to be the most suitable for an evaluation of the habituation. (5) Less early learning process was observed in jaw tapping movement commanded by the repetitive signal with random intersignal interval.(6) Tapping point just after condigioning by sustained maximum voluntary clenching for 30sec in eccentric positions was deviated for to the conditioning side, with the exception of the conditioning at retruded position.(7) This effect of the conditioning seemed to be clear in the lst or 2nd trial of a 30-sequential tapping. 「Furthermore, if the side of occlusal contact were coincident with the Jaw deviated side during the conditioning, the effect was enhanced.(8) The results mentioned above gave us the fundamental data to evaluate the regulata of the masticatory motor system.