International Laboratory for Brain, Music and Sound Research, Department of Psychology, Université de Montréal, Montreal, Québec, Canada.
Brain Lang. 2013 Apr;125(1):106-17. doi: 10.1016/j.bandl.2013.01.011. Epub 2013 Mar 5.
We tested whether congenital amusics, who exhibit pitch perception deficits, nevertheless adjust the pitch of their voice in response to a sudden pitch shift applied to vocal feedback. Nine amusics and matched controls imitated their own previously-recorded speech or singing, while the online feedback they received was shifted mid-utterance by 25 or 200 cents. While a few amusics failed to show pitch-shift effects, a majority showed a pitch-shift response and nearly half showed a normal response to both large and small shifts, with similar magnitudes and response times as controls. The size and presence of the shift response to small shifts were significantly predicted by participants' vocal pitch matching accuracy, rather than their ability to perceive small pitch changes. The observed dissociation between the ability to consciously perceive small pitch changes and to produce and monitor vocal pitch provides evidence for a dual-route model of pitch processing in the brain.
我们测试了先天性失歌症患者（他们表现出音高感知缺陷）是否会根据语音反馈中突然出现的音高变化来调整自己的音高。9 名失歌症患者和匹配的对照组模仿自己之前录制的演讲或唱歌，而他们正在接收的在线反馈在说话中途被转移了 25 或 200 音分。虽然少数失歌症患者未能表现出音高变化效应，但大多数人表现出音高变化反应，近一半人对大、小音高变化都表现出正常反应，与对照组的幅度和反应时间相似。对小音高变化的音高变化反应的大小和存在显著地由参与者的声音音高匹配准确性来预测，而不是由他们感知小音高变化的能力来预测。这种在能够有意识地感知小音高变化与产生和监控声音音高的能力之间的观察到的分离为大脑中的音高处理提供了双路径模型的证据。
