Department of Communication Disorders and Sciences, Rush University Medical Center, 600 South Paulina Street, 1012 AAC, Chicago, Illinois 60612, USA.
J Acoust Soc Am. 2011 Oct;130(4):2076-87. doi: 10.1121/1.3631629.
Perception of interrupted speech and the influence of speech materials and memory load were investigated using one or two concurrent square-wave gating functions. Sentences (Experiment 1) and random one-, three-, and five-word sequences (Experiment 2) were interrupted using either a primary gating rate alone (0.5-24 Hz) or a combined primary and faster secondary rate. The secondary rate interrupted only speech left intact after primary gating, reducing the original speech to 25%. In both experiments, intelligibility increased with primary rate, but varied with memory load and speech material (highest for sentences, lowest for five-word sequences). With dual-rate gating of sentences, intelligibility with fast secondary rates was superior to that with single rates and a 25% duty cycle, approaching that of single rates with a 50% duty cycle for some low and high rates. For dual-rate gating of words, the positive effect of fast secondary gating was smaller than for sentences, and the advantage of sentences over word-sequences was not obtained in many dual-rate conditions. These findings suggest that integration of interrupted speech fragments after gating depends on the duration of the gated speech interval and that sufficiently robust acoustic-phonetic word cues are needed to access higher-level contextual sentence information.
使用一个或两个并发的方波选通函数研究了中断语音的感知以及语音材料和记忆负载的影响。句子（实验 1）和随机的一、三、五个单词序列（实验 2）分别使用单独的主要选通率（0.5-24 Hz）或主要和更快的次要选通率的组合进行中断。次要选通仅中断主要选通后未受干扰的语音，将原始语音减少到 25%。在这两个实验中，主要速率越高，可理解度越高，但受记忆负载和语音材料的影响（句子最高，五个单词序列最低）。对于句子的双速率选通，使用快速次要速率的可理解度优于单速率和 25%的占空比，对于某些低和高速率，接近 50%占空比的单速率。对于单词序列的双速率选通，快速次要选通的积极作用小于句子，并且在许多双速率条件下都没有获得句子优于单词序列的优势。这些发现表明，选通后中断语音片段的整合取决于选通语音间隔的持续时间，并且需要足够稳健的声学语音单词提示来访问更高层次的上下文句子信息。
