Northeastern University, Boston, MA, USA.
J Speech Lang Hear Res. 2011 Aug;54(4):1051-9. doi: 10.1044/1092-4388(2010/10-0162). Epub 2010 Dec 20.
A feedback perturbation paradigm was used to investigate whether prosodic cues are controlled independently or in an integrated fashion during sentence production.
Twenty-one healthy speakers of American English were asked to produce sentences with emphatic stress while receiving real-time auditory feedback of their productions. The fundamental frequency (F0) of the stressed word in each 4-word sentence was selectively shifted in a sensorimotor adaptation protocol. Speakers experienced either an upward or a downward shift of the stressed word, which gradually altered the perceived stress of the sentence.
Participants in the Up and Down groups adapted to F0 shifts by altering the contrast between stressed and unstressed words differentially, such that the two groups deviated from each other in the perturbation phase. Furthermore, selective F0 perturbation in sentences with emphatic stress resulted in compensatory changes in both F0 and intensity.
Present findings suggest that F0 and intensity are controlled in an integrated fashion to maintain the contrast between stressed and unstressed words. When a cue is impaired through perturbation, speakers not only oppose the perturbation but enhance other prosodic cues to achieve emphatic stress.
采用反馈干扰范式研究在句子生成过程中韵律线索是独立控制还是以集成的方式进行控制。
21 名以英语为母语的健康美国成年人被要求在产生强调重音的句子的同时接受实时的听觉反馈。每个 4 词句中强调词的基频（F0）根据感觉运动适应协议进行有选择性的调整。参与者经历了强调词的上升或下降的调整，这逐渐改变了句子的感知重音。
在“Up”和“Down”组中，参与者通过不同地改变重音词和非重音词之间的对比来适应 F0 调整，因此在干扰阶段两组之间存在差异。此外，在强调重音的句子中进行选择性的 F0 干扰会导致 F0 和强度都发生补偿性变化。
目前的发现表明，F0 和强度以集成的方式进行控制，以维持重音词和非重音词之间的对比。当通过干扰破坏一个线索时，说话者不仅会抵制干扰，而且会增强其他韵律线索来实现强调重音。
