Binaural Beats and Binaural Amplitude-Modulated Tones: Successive Comparison of Loudness Fluctuations

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Abstract
An objective psychophysical method for measuring one of the results of binaural (neural) interaction to low-intensity pure tones is presented. Successive comparison of the strength of loudness fluctuations of binaural beats (BB) with loudness fluctuations produced by binaurally presented amplitude-modulated tones is used. The dependency of the percent, amplitude modulation (AM) is required for a match on stimulus parameters is investigated. At a given frequency level of the tones, the matches are not affected when the frequency difference is changed from 2 to 6 cps. The percent AM required for a match increases when sensation level (SL) decreases from 30 to 10 dB. When frequency level is changed, the matches are about the same for 150 and 300 cps, but much less AM is required at 600 cps. Changes in the detection threshold with SL fail to predict the corresponding changes in the matches.

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