Weber D L
J Acoust Soc Am. 1983 Mar;73(3):887-93. doi: 10.1121/1.389012.
Psychophysical tuning curves obtained in forward masking show greater tuning than those obtained in simultaneous masking. This difference is often attributed to the contribution of suppression to the masking produced by off-frequency simultaneous maskers. In this experiment, simultaneous-masking tuning curves were obtained using a 195-ms, 1-kHz sinusoidal signal presented at 40 dB SPL. If the maskers identified in this procedure reduce signal detectability by suppressing the response to the signal, then it should be possible to demonstrate suppression effects between stimuli with the parameters of the masker and signal. One conventional method for demonstrating suppression is to show a reduction in the amount of forward masking produced by one stimulus when a second stimulus is added to it. When used to test the effect of the masker upon the signal, this procedure does not show the suppression supposedly produced by the off-frequency maskers. These data are consistent with an alternative explanation involving only excitatory interactions between masker and signal.
在前向掩蔽中获得的心理物理调谐曲线比在同时掩蔽中获得的调谐曲线具有更强的调谐性。这种差异通常归因于抑制对偏离频率的同时掩蔽器产生的掩蔽作用的贡献。在本实验中，使用在40 dB声压级呈现的195毫秒、1千赫兹的正弦信号获得同时掩蔽调谐曲线。如果在此过程中识别出的掩蔽器通过抑制对信号的响应来降低信号可检测性，那么应该可以用掩蔽器和信号的参数来证明刺激之间的抑制效应。一种证明抑制的传统方法是，当向一个刺激添加第二个刺激时，显示该刺激产生的前向掩蔽量减少。当用于测试掩蔽器对信号的影响时，该过程并未显示出偏离频率的掩蔽器理应产生的抑制作用。这些数据与一种仅涉及掩蔽器和信号之间兴奋性相互作用的替代解释一致。
