Temporal weighting for interaural time differences in low-frequency pure tones
Temporal weighting for interaural time differences in low-frequency pure tones
复制标题
低频纯音中耳间时间差的时间加权
DOI：
10.1121/1.4755542
复制
发表时间：
2012
影响因子：
2.4
通讯作者：
G. C. Stecker
中科院分区：
文献类型：
--
作者：
Anna C. Diedesch;Jacqueline M. Bibee;G. C. Stecker
与高频时基于包络的耳间时差（ITD）相比，在高频时，声音起主导作用，低频时（<1500 Hz）的可靠性和显著性精细结构ITD表明，在持续刺激波形的各个周期中，对信息的灵敏度是一致的。然而，过去的几项研究表明，低频过渡段阈值随着声音持续时间的增加而改善得不太理想[例如Houtgast & Plomp 1968， JASA 44:807-12]，这表明短音的初始阶段在过渡段加工中比后期阶段发挥更大的作用。在这里，我们在250-1000 Hz的纯音范围内测量了过渡段灵敏度的时间分布。声音的过渡段要么在声音持续时间内保持固定（条件RR），要么线性发展，从声音的开始（条件0R）或结束（R0）消除过渡段线索。持续时间从40-640毫秒不等，包括20毫秒的斜坡，以尽量减少包络信号。过渡段检测阈值…
In contrast to envelope-based interaural time differences (ITD) at high frequencies, where sound onsets play a dominant role, the reliability and salience fine-structure ITD at low frequency (<1500 Hz) suggests uniform sensitivity to information across periods of an ongoing stimulus waveform. Several past studies, however, have demonstrated low-frequency ITD thresholds to improve sub-optimally with increasing sound duration [e.g. Houtgast & Plomp 1968, JASA 44:807-12], suggesting that the initial periods of a brief tone play a greater role in ITD processing than do later periods. Here, we measured the temporal profile of ITD sensitivity in pure tones ranging from 250-1000 Hz. Sounds were presented with ITD that either remained fixed over the sound duration (condition RR) or progressed linearly to eliminate the ITD cue from either the beginning (condition 0R) or end (R0) of the sound. Durations varied from 40-640 ms, including 20 ms ramps applied diotically to minimize envelope cues. ITD detection threshol...