Continuity Effects with Alternately Sounding Tones

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Abstract
When one tone, A, of 21-msec duration was sounded alternately with a tone, B, 11.3 times/sec, tone B appeared to sound continuous if tone A was made 10 to 20 db higher in sensation level than tone B. The intensity required to produce the "continuity" effect was found to be least when tone A was near to tone B in frequency. The continuity of tone B could be broken, however, by increasing the off-time of tone B which also increased the on-time of tone A. To measure this more precisely, duration of interruption (off-time) of tone B was varied, and continuity thresholds were obtained for tone B alternating with tone A, when A was set near in frequency to B and at 15 db higher sensation level. It was found that tone B sounded continuous with longer off-times when tone A was present during the interuptions than when it was absent. Certain of these thresholds varied as a function of the rate at which tones A and B were alternated.

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