Department of Human Science, Faculty of Design/Research Center for Applied Perceptual Science/Research and Development Center for Five-Sense Devices, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan.
Open Systems Information Science Team, Advanced Data Science Project (ADSP), RIKEN Information Research and Development and Strategy Headquarters (R-IH), RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.
J Acoust Soc Am. 2022 Aug;152(2):970. doi: 10.1121/10.0013425.
The intelligibility of interrupted speech stimuli has been known to be almost perfect when segment duration is shorter than 80 ms, which means that the interrupted segments are perceptually organized into a coherent stream under this condition. However, why listeners can successfully group the interrupted segments into a coherent stream has been largely unknown. Here, we show that the intelligibility for mosaic speech in which original speech was segmented in frequency and time and noise-vocoded with the average power in each unit was largely reduced by periodical interruption. At the same time, the intelligibility could be recovered by promoting auditory grouping of the interrupted segments by stretching the segments up to 40 ms and reducing the gaps, provided that the number of frequency bands was enough ( ≥ 4) and the original segment duration was equal to or less than 40 ms. The interruption was devastating for mosaic speech stimuli, very likely because the deprivation of periodicity and temporal fine structure with mosaicking prevented successful auditory grouping for the interrupted segments.
当分段时长短于 80ms 时，中断语音刺激的可懂度几乎为完美，这意味着在这种条件下，中断的片段被感知为组织成一个连贯的流。然而，为什么听众能够成功地将中断的片段组合成一个连贯的流，在很大程度上仍然未知。在这里，我们表明，通过周期性中断，将原始语音分段为频率和时间，并通过每个单元的平均功率进行噪声编码的镶嵌语音的可懂度大大降低。同时，如果增加片段的时长至 40ms 并减少片段之间的间隔，并且原始片段的时长等于或小于 40ms，则可以通过促进中断片段的听觉分组来恢复可懂度，前提是频带数量足够（≥4）。中断对镶嵌语音刺激具有破坏性影响，这很可能是因为镶嵌导致周期性和时间精细结构的丧失，从而阻止了对中断片段的成功听觉分组。
