INDIVIDUATED FINGER MOVEMENTS OF RHESUS-MONKEYS - A MEANS OF QUANTIFYING THE INDEPENDENCE OF THE DIGITS
INDIVIDUATED FINGER MOVEMENTS OF RHESUS-MONKEYS - A MEANS OF QUANTIFYING THE INDEPENDENCE OF THE DIGITS
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DOI：
10.1152/jn.1991.65.6.1381
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发表时间：
1991-06-01
影响因子：
2.5
通讯作者：
SCHIEBER, MH
中科院分区：
文献类型：
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作者：
SCHIEBER, MH
1. 两只恒河猴被训练进行右手和手腕每个手指的弯曲和伸展运动。同时监测所有五个手指和手腕的运动。在每次指示运动中，指示手指（或手腕）的偏移最大；其他未指示的数字移动的程度也不同。为了评估不同数字在这些运动中的独立程度，我绘制了指示数字位置的函数图，作为每个非指示数字的位置。所得到的轨迹通常是线性的，从一个试验到另一个试验具有一致的斜率。这些非指示数字与指示数字轨迹的斜率用于计算每个指示运动的个性化指数和每个数字的平稳性指数。这些指标量化了独立性的两个不同方面。个性化指数反映了在给定数字的指示运动中其他数字保持静止的程度。平稳性指数反映了给定数字在是非指示数字时保持静止的程度。根据随意观察，拇指屈曲和腕关节屈伸始终具有高度的个体化和平稳性，因此可以说是独立于手指的。虽然其他手指的情况并非如此，但本分析也提供了一种量化这些手指独立程度的方法。讨论了可能导致非指示数字运动和轨迹线性的因素。
1. Two rhesus monkeys were trained to perform flexion and extension movements of each digit of the right hand and of the wrist. Movements of all five digits and the wrist were monitored simultaneously. During each instructed movement, the instructed digit (or wrist) had the greatest excursion; other, noninstructed digits moved to varying degrees.2. To assess the degree of independence of the different digits during these movements, I plotted, as a function of the instructed digit's position, the position of each noninstructed digit. The resulting trajectories typically were linear, with consistent slopes from trial to trial.3. The slopes of these noninstructed digit versus instructed digit trajectories were used to calculate an individuation index for each instructed movement and a stationarity index for each digit. These indexes quantified two different aspects of independence. The individuation index reflects the degree to which other digits remained still during instructed movement of a given digit. The stationarity index reflects the degree to which a given digit remained still whenever it was a noninstructed digit.4. In accordance with casual observation, thumb flexion and wrist flexion and extension consistently had both high individuation and stationarity and therefore can be said to be independent of the fingers. Although the same cannot be said of the other fingers, the present analysis provides a means of quantifying the degree of independence of these digits as well.5. Factors are discussed that might contribute to the motion of noninstructed digits and to the trajectory linearity.