Stochastic aspects of motor behavior and their dependence on auditory feedback in experienced cellists
Stochastic aspects of motor behavior and their dependence on auditory feedback in experienced cellists
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DOI：
10.3389/fnhum.2013.00419
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发表时间：
2013-07-31
影响因子：
2.9
通讯作者：
Moore, George P.
中科院分区：
文献类型：
--
作者：
Chen, Jessie;Woollacott, Marjorie;Moore, George P.
本研究旨在调查经验丰富的大提琴手的动作准确性，他们在互惠任务中音符序列的统计特性，以及这些动作特征在多大程度上依赖于听觉反馈。九名经验丰富的大提琴手被要求只用食指在两个音符之间交替移动，以接触弦和指板。变换序列以每秒一个音符的速度持续了两分钟。这项任务在两种情况下进行：有听觉反馈（由弓提供）或没有听觉反馈（即弓提供）。（不使用弓）。当使用弓时，受试者在目标音符之间精确而稳定地转换没有任何困难。存在一些可变性，但这些序列中的音符通常不相关。大多数弯曲试验中的接触数据和相关性类似于更新过程的预期，在更新过程中，连续值在统计上独立且分布相同。没有弓，受试者就失去了准确到达相同目标位置的能力；接触位置倾向于漂移，具有随机性，表明受试者在没有弓的情况下，相对于指尖的空间位置，目标位置是不确定的。在这些未弯曲的序列中，手指的位置与音符序列内和音符序列之间高度相关。在一些实验中，序列的统计相关模式与离散维纳过程的预期一致。在我们的整个研究中，更新和维纳过程的计算机模拟使dus能够确定从这些理论模型中预期的相关性类型。重新讨论了统计结果在受试者行为方面的含义。
This study aimed to investigate movement accuracy of experienced cellists, the statistical properties of their note sequences during a reciprocal task, and the degree to which these movement characteristics depend on auditory feedback. Nine experienced cellists were asked to shift alternately between two notes using only their index finger to make contact with the stringand finger board. Shifting sequences continued for two minutes at a rate of one note per second. The task was performed under two conditions: with auditory feedback (provided by the bow) or without auditory feedback(i.e., without the use of bow). When the bow was used, subjects had no difficulty in shifting between target notes with precision and stability. Some variability was present, but notes in these sequences were generally uncorrelated. The contact data and correlations in most bowed trials resembled those expected of a renewal process, a process in which successive values are statistically independent and identically distributed. Without the bow, subjects lost their ability to reach the same target positions accurately; contact locations tended to drift and had a random quality, indicating that without the bow subjects were uncertain of the target location in relation to the spatial location of their fingertips. Within these unbowed sequences, finger positions were highly correlated-with in and between note sequences. In some trial swith out the bow, the statistical correlation patterns of the sequence were consistent with the expectations of a discrete Wiener process. Throughout our study, computer simulations of renewal and Wiener processes enable dus to determine the types of correlations to be expected from these theoretical models. The implications of the statistical results interms of subject behavior a rediscussed.