Henry K R
Dept. of Psychology, University of California, Davis 95616.
Hear Res. 1987;30(1):1-10. doi: 10.1016/0378-5955(87)90176-6.
Simultaneous and forward maskers were used to generate 'onset' and 'offset' compound action potential tuning curves (TCs) in the gerbil. The simultaneously masked offset TC, generated in response to a 16 kHz, 65 dB SPL probe stimulus, is W-shaped, with a low frequency tip at 11 kHz, a high frequency tip at 20 kHz, and a peak which occurs at 16 kHz. The 16 kHz forward masked onset TC has a single tip which occurs at 11 kHz. Although it lacks the finely tuned peak and high frequency tip of the stimultaneously masked offset TC, its single tip is more finely tuned than the low frequency tip of the simultaneously masked offset TC. Normalizing these two TCs [(1977) J. Acoust. Soc. Am. 62, 1048-1051] produces a figure which resembles 11 kHz onset TCs with their nonoverlapping regions which are analogs of two-tone suppression (2TS). A similar pattern occurs when probe stimuli at frequencies from 13 to 24 kHz are used to generate offset TCs; i.e., the forward masked offset TC resembles an onset TC and normalizing it to a simultaneously masked offset TC produces areas which resemble analogs of 2TS. Unmasking of the forward masked onset TCs [(1979) Hear, Res. 1, 133-154] produces regions of 2TS which are very similar to those produced by unmasking the forward masked offset TC which is generated by a higher frequency tone. These regions of 2TS for the Offset TC, as determined by unmasking, are very similar to the analogs of 2TS described above.
在沙鼠中，同时掩蔽器和前向掩蔽器被用于生成“起始”和“终止”复合动作电位调谐曲线（TCs）。响应于16kHz、65dB SPL的探测刺激而生成的同时掩蔽终止TC呈W形，低频顶点在11kHz，高频顶点在20kHz，峰值出现在16kHz。16kHz前向掩蔽起始TC有一个单一顶点，出现在11kHz。尽管它缺乏同时掩蔽终止TC的精细调谐峰值和高频顶点，但其单一顶点比同时掩蔽终止TC的低频顶点调谐更精细。对这两条TC进行归一化处理[（1977年）《美国声学学会杂志》62卷，1048 - 1051页]会得到一个图形，它类似于11kHz起始TC及其不重叠区域，这些区域类似于双音抑制（2TS）。当使用13至24kHz频率的探测刺激来生成终止TC时，会出现类似的模式；即，前向掩蔽终止TC类似于起始TC，将其归一化为同时掩蔽终止TC会产生类似于2TS类似物的区域。对前向掩蔽起始TC进行解掩蔽处理[（1979年）《听觉研究》1卷，133 - 154页]会产生2TS区域，这些区域与通过对由更高频率音调生成的前向掩蔽终止TC进行解掩蔽处理所产生的区域非常相似。通过解掩蔽确定的该终止TC的这些2TS区域与上述2TS类似物非常相似。
