Subramaniam M, Salvi R J, Saunders S S, Boettcher F A
Department of Communicative Disorders and Sciences, SUNY University, Buffalo.
Audiology. 1990;29(4):202-11. doi: 10.3109/00206099009072851.
Tone-on-tone masking patterns were measured at 0.5, 1, and 4 kHz using the auditory-evoked response from the inferior colliculus of the chinchilla. Masking profiles obtained with a masking level of 30 dB SPL were relatively symmetrical; however, as masker level increased, masking spread toward the high frequencies, particularly with the 0.5-kHz masker. For masker frequencies of 1 and 4 kHz, a low-threshold notch was observed in the masking profile 2/3 of an octave above the frequency of the masker. The low-threshold notch may represent a response to the distortion tone 2F1-F2. The notch was absent in the 0.5-kHz masking profile. The masking profiles obtained with the evoked response are somewhat wider, but otherwise qualitatively similar to those measured psychophysically in humans. Thus, the evoked-response procedure may provide a convenient way of evaluating the spread of masking and the presence of distortion tones in difficult-to-test subjects.
使用来自龙猫下丘的听觉诱发反应，在0.5、1和4千赫测量了同色调掩蔽模式。在30分贝声压级的掩蔽水平下获得的掩蔽轮廓相对对称；然而，随着掩蔽声级增加，掩蔽向高频扩展，特别是使用0.5千赫的掩蔽声时。对于1千赫和4千赫的掩蔽频率，在掩蔽频率上方三分之二个八度的掩蔽轮廓中观察到一个低阈值凹口。低阈值凹口可能代表对失真音调2F1 - F2的反应。该凹口在0.5千赫的掩蔽轮廓中不存在。用诱发反应获得的掩蔽轮廓稍宽，但在其他方面与在人类中通过心理物理学测量的掩蔽轮廓在性质上相似。因此，诱发反应程序可能提供一种方便的方法来评估难以测试的受试者中的掩蔽扩展和失真音调的存在。
