Department of Psychology, National Key Center on Machine Perception, Speech and Hearing Research Center, Peking University, Beijing 100871, China.
Hear Res. 2011 May;275(1-2):139-49. doi: 10.1016/j.heares.2010.12.013. Epub 2010 Dec 22.
Duration thresholds for detecting a change in interaural correlation (from 0 to 1, or from 1 to 0) in the initial portion of a 1-second, broadband noise (0-10 kHz) were determined for younger and older adults in a two-interval, two-alternative forced choice paradigm as a function of the interaural delay between the noise bursts presented to each ear. When the interaural delay was 0 ms, older adults found it harder to detect a change in correlation from 0 to 1 than from 1 to 0. For younger adults, however, this pattern was reversed. For interaural delays greater than 0 ms, both younger adults and older adults found it easier to detect a change in interaural correlation from 0 to 1 for short interaural delays (1 ms) with the reverse being true for longer interaural delays (5 ms). It is shown that this pattern of results is expected if temporal jitter (loss of neural synchrony in the auditory system) increases with age and with interaural delay. The implications of these results for age-related changes in stream segregation are discussed.
在两间隔两选择强制选择范式中，确定了年轻人和老年人在 1 秒宽带噪声（0-10 kHz）初始部分中检测耳间相关变化的持续时间阈值（从 0 到 1，或从 1 到 0），作为每个耳朵接收到的噪声爆发之间的耳间延迟的函数。当耳间延迟为 0 毫秒时，老年人发现从 0 到 1 检测相关性变化比从 1 到 0 更难。然而，对于年轻人来说，这种模式是相反的。对于大于 0 毫秒的耳间延迟，年轻人和老年人都发现对于短耳间延迟（1 毫秒），从 0 到 1 检测耳间相关变化更容易，而对于更长的耳间延迟（5 毫秒）则相反。如果时间抖动（听觉系统中神经同步的丧失）随年龄和耳间延迟而增加，则可以预期这种结果模式。讨论了这些结果对流分离中年龄相关变化的影响。
