![]() Twelve normal-hearing adults participated in this study. Rate discrimination was measured for standard rates of 4, 8, 16, and 32 Hz – all in the 500-Hz carrier region. The purpose of this study was to gauge the strength of the binaural beat percept by matching its salience to that of sinusoidal amplitude modulation (SAM), and to then compare rate discrimination for the two types of fluctuation. Previous studies of binaural beats have noted individual variability and response lability, but little attention has been paid to the salience of the binaural beat percept. Some neurons in our sample responded selectively to manipulations of these two variables, which suggests a sensitivity to direction or speed of movement. In addition, this stimulus allowed the direction and rate of interaural phase change to be varied. The response of most cells was phase-locked to the beat frequency, which provides a possible neural correlate to the human sensation of binaural beats. The interaural phase sensitivity of neurons was studied through the use of binaural beat stimuli. Response of cat inferior colliculus neurons to binaural beat stimuli: possible mechanisms for sound localization.
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