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AM-evoked slow cortical responses(SCR)were recorded in awake guinea pigs and the response thresholdin terms of amplitude increament in dB was determined.A quasi-rectangular pulse of 200 ms durationand with a repetition rate of 1/sec served as the modulating wave.The typical AM-evoked SCR assumes apositive-negative-positive triphasic waveform appearing 40—200ms after the on-set or off-set of modulation.For white noise,for repetitive clicks(1000pps)and for tones(125Hz—16kHz)in a very wide carrier levelrange(30—90 dB L_p),the values are only around 0.5 dB,quite close to those for human obtained bypsychophysical methods,suggesting that the SCR values can represent the intensity difference limens forthe animals.A guinea pig curve,i.e.,the functional curve of versus I,is constructed.This curve issupposed to be the first complete and convincing curve for animal.
AM-evoked slow cortical responses (SCR) were recorded in awake guinea pigs and the response threshold in terms of amplitude increament in dB was determined. A quasi-rectangular pulse of 200 ms duration and with a repetition rate of 1 / sec served as the modulating wave The typical AM-evoked SCR assumes positive-negative-positive triphasic waveform appearing 40-200ms after the on-set or off-set of modulation. For white noise, for repetitive clicks (1000pps) and for tones (125Hz-16kHz) in a very wide carrier levelrange (30-90 dB L_p), the values are only around 0.5 dB, quite close to those for human obtained bypsychophysical methods, suggesting that the SCR values can represent the intensity difference limens forthe animals.A guinea pig curve, ie, the functional curve of versus I, is constructed. This curve issupposed to be the first complete and convincing curve for animal.