Rate‐intensity functions and their modification by broadband noise for neurons in the guinea pig inferior colliculus

摘要: Rate‐intensity functions (RIFs) were generated in response to characteristic frequency (CF) tones presented alone and the presence of broadband noise for neurons central nucleus inferior colliculus (IC) anesthetized guinea pig. Seventy‐six percent RIFs CF monotonic (some showing incomplete saturation), 24% nonmonotonic. The continuous more nonmonotonic than those tones. In or gated noise, dynamic portion RIF a tone was shifted higher level, with little change range. Above threshold shift linear function level slope 0.97. Little occurred when inversely respect burst, suggesting that underlying mechanism is suppression rather adaptation. For 63% units, maximum discharge rate low levels (<0‐dB spectrum level) (including gated) greater alone. Although many effects IC reflect peripheral mechanisms, they are supplemented by centrally based processes which enhance detectability intensity increments noise.