Salminen Nelli H
Brain and Mind Laboratory, Department of Biomedical Engineering and Computational Science and MEG Core, Aalto NeuroImaging, Aalto University School of Science, Espoo, Finland
J Acoust Soc Am. 2015 Feb;137(2):EL190-3. doi: 10.1121/1.4907736.
Interaural level difference (ILD) is used as a cue in horizontal sound source localization. In free field, the magnitude of ILD depends on frequency: it is more prominent at high than low frequencies. Here, a magnetoencephalography experiment was conducted to test whether the sensitivity of the human auditory cortex to ILD is also frequency-dependent. Robust cortical sensitivity to ILD was found that could not be explained by monaural level effects, but this sensitivity did not differ between low- and high-frequency stimuli. This is consistent with previous psychoacoustical investigations showing that performance in ILD discrimination is not dependent on frequency.
双耳声级差（ILD）被用作水平声源定位的线索。在自由声场中，ILD的大小取决于频率：在高频比低频时更显著。在此，进行了一项脑磁图实验，以测试人类听觉皮层对ILD的敏感性是否也与频率有关。研究发现，皮层对ILD具有稳健的敏感性，这无法用单耳声级效应来解释，但这种敏感性在低频和高频刺激之间并无差异。这与先前的心理声学研究结果一致，表明ILD辨别能力并不依赖于频率。
