Department of Psychology, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5.
Neurosci Lett. 2012 Nov 7;529(2):128-32. doi: 10.1016/j.neulet.2012.09.012. Epub 2012 Sep 17.
Auditory feedback plays an important role in monitoring vocal output and determining when adjustments are necessary. In this study a group of untrained singers participated in a frequency altered feedback experiment to examine if accuracy at matching a note could predict the degree of compensation to auditory feedback that was shifted in frequency. Participants were presented with a target note and instructed to match the note in pitch and duration. Following the onset of the participants' vocalizations their vocal pitch was shifted down one semi-tone at a random time during their utterance. This altered auditory feedback was instantaneously presented back to them through headphones. Results indicated that note matching accuracy did not correlate with compensation magnitude, however, a significant correlation was found between baseline variability and compensation magnitude. These results suggest that individuals with a more stable baseline fundamental frequency rely more on feedforward control mechanisms than individuals with more variable vocal production. This increased weighting of feedforward control means they are less sensitive to mismatches between their intended vocal production and auditory feedback.
听觉反馈在监测发声输出和确定何时需要调整方面起着重要作用。在这项研究中，一组未经训练的歌手参与了频率改变反馈实验，以检验匹配音符的准确性是否可以预测对频率偏移的听觉反馈的补偿程度。参与者被呈现一个目标音符，并被指示在音高和持续时间上匹配该音符。在参与者的发声开始后，他们的音高在他们的发音过程中的任意时间随机下降一个半音。通过耳机即时向他们呈现这种改变的听觉反馈。结果表明，音符匹配的准确性与补偿幅度没有相关性，但是，在基线变异性和补偿幅度之间发现了显著的相关性。这些结果表明，具有更稳定基频的个体比具有更可变发声的个体更依赖前馈控制机制。这种前馈控制的权重增加意味着它们对意图发声和听觉反馈之间的不匹配不那么敏感。
