A study in the strategy for motor control of human masticatory system - about the participation of anticipation -

5名老年人（平均年龄72岁），3名老年人（65岁），9名年轻人（25岁），9名年轻人（24岁），9名年轻人（25岁），9名年轻人（24岁），进行下颌敲击动作的时间与随机间隔的声学信号序列，1.3 Hz的间隔出现最频繁。双任务组被要求在执行下巴敲击的同时记住监视器屏幕上的单词。观察咬肌肌电图（Mm）、下颌肌运动图、声信号在剩余牙槽骨上的变化。1.在双重任务组中，剩余敲击的发生率与1.3 Hz重复的次数无关，并且在1.3 Hz x 2的间隔后非常低。双任务组的差距较小。2.在1.3 Hz x 2的间隔之后的剩余轻敲出现在距前一信号1.3 Hz的间隔处，并且在一些1.3 Hz x 2的间隔之后开始出现。3.在距前一信号1.3Hz间隔处的预期信号与剩余分接的Mm突发开始之间的时间滞后：在1.3Hz间隔之后的剩余分接处，这些平均值较小。(We推测Mm爆发的开始是在信号确认之前。）这些平均值在1.3 Hz x 2间隔后的剩余攻丝处较大。(We推测两个老年组中Mm爆发发作开始于信号确认之后。）4.除双任务组外，1.3HZ重复次数越多，间隔越大。5.老年组有较多的完全剩余割肉，青年组有较多的不完全剩余割肉。6.在双任务组中，第二个任务不是分心注意任务，而是唤醒任务。受试者记住出现频率最高的间隔，多余的敲击出现在这些间隔。这些显示了对预期的依赖程度。

Five elderly dentulous people (mean age 72), three elderly edentulous people with dentures (65), nine dentulous young adults (25), nine dentulous young adults instructed dual-task (24), performed jaw-tapping movements in time to an acoustic signal train with random intervals, that 1.3 Hz interval appears the most frequently. The dual-task group was instructed to memorize words on the monitor screen while performing jaw tapping. We observed some parameters among Masseteric muscle EMG (Mm), Mandibular Kinegiogram, and acoustic signal on surplus tappings. 1. Incidences of surplus tapping in the dual-task group have no relation to numbers of 1.3 Hz repetition and were very low after intervals of 1.3 Hz x 2. Gape in dual-task group is small. 2. The surplus tapping after the interval of 1.3 Hz x 2 appear at intervals of 1.3 Hz from the preceding signal, and began to appear after some 1.3 Hz x 2 intervals. 3. The time lags between the expected signal at intervals of 1.3 HZ from the preceding signal and Mm burst onset of the surplus taping: Those average is smaller at the surplus tapping after 1.3 Hz intervals. (We guess that onset of Mm burst is before the confirmation of signal.) Those average is larger at the surplus tapping after 1.3 Hz x 2 intervals. (We guess that Mm burst onset in both elderly group begin after confirmation of signal.) 4. The more numbers of 1.3 HZ repetition is, the larger gape is except dual-task group. 5. The elderly group have more complete surplus tapping and the young group more incomplete surplus tapping. 6. It can be summarized as follows: In the dual-task group, the second task is not a distracted attention task but an arousal task. Subjects remember intervals that appear the most frequently, the surplus tapping appear at those intervals. And these show the degree of dependence on anticipation.