Abstract
This paper reports on a measurement of the absolute threshold for a two-tone signal as a function of the frequency separation between the tones. When interpreted in terms of an energy detection model (peripheral filter followed by squarer, integrator, and threshold detector), the measurements give an estimate of the time constant of the integrator. This time constant has been estimated by many investigators, and published estimates range from 10 to 500 msec. Our measurements on two subjects give a value in the neighborhood of 150 msec.
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