Soeta Yoshiharu, Nakagawa Seiji
Institute for Human Science and Biomedical Engineering, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka, Japan.
Neuroreport. 2006 Apr 3;17(5):505-9. doi: 10.1097/01.wnr.0000208998.31072.e4.
The two cues to the horizontal location sound sources are interaural time differences and interaural level differences. For low-frequency tones, interaural time differences provide effective and unambiguous information. For higher frequency sounds, however, interaural time differences provide ambiguous cues. In order to evaluate the effect of frequency of interaural time differences in the human auditory cortex, the auditory evoked fields to different interaural time differences of pure tone were examined. The results showed that the N1m magnitudes varied with the interaural time differences when the frequency of the pure tone was 800 Hz. The N1m magnitudes, however, did not vary with the interaural time differences when the frequency of the pure tone was 1600 Hz. These results indicate that localization performance might be reflected in N1m magnitudes.
声音源水平位置的两个线索是双耳时间差和双耳声级差。对于低频音调，双耳时间差提供有效且明确的信息。然而，对于高频声音，双耳时间差提供的线索并不明确。为了评估双耳时间差频率对人类听觉皮层的影响，研究人员检测了纯音不同双耳时间差下的听觉诱发电位场。结果表明，当纯音频率为800赫兹时，N1m波幅随双耳时间差而变化。然而，当纯音频率为1600赫兹时，N1m波幅并不随双耳时间差而变化。这些结果表明，定位表现可能反映在N1m波幅上。
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