Robertson L F, Salvi R J, Poon M, Powers N L
Department of Communicative Disorders and Sciences, SUNY University, Buffalo 14214.
Am J Otol. 1990 Nov;11(6):431-6.
Tone-on-tone masking patterns were measured in the chinchilla using the auditory evoked response from the inferior colliculus. The masker was a 2 kHz continuous tone presented at one of five levels from 20 to 70 dB SPL. The evoked response was elicited with tone bursts presented over a wide range of frequencies. Masking was defined as the difference between evoked response thresholds measured in the presence of the masker versus quiet. At low masker levels, the masking profile was symmetrical and centered around 2 kHz. However, as masker level increased, masking spread toward the high frequencies. Furthermore, at masker levels above 50 dB SPL, a low-threshold notch occurred above the masker. The masking profiles obtained with the evoked response are in good agreement with those obtained psychophysically.
使用来自下丘的听觉诱发反应，在灰鼠中测量了同色掩蔽模式。掩蔽音是一个2kHz的连续纯音，以20至70dB SPL的五个水平之一呈现。诱发反应由在很宽频率范围内呈现的短纯音诱发。掩蔽被定义为在存在掩蔽音与安静条件下测量的诱发反应阈值之间的差异。在低掩蔽音水平时，掩蔽轮廓是对称的，且以2kHz为中心。然而，随着掩蔽音水平增加，掩蔽向高频扩展。此外，在掩蔽音水平高于50dB SPL时，在掩蔽音上方出现一个低阈值凹陷。通过诱发反应获得的掩蔽轮廓与通过心理物理学方法获得的掩蔽轮廓高度一致。
