Simultaneous Two-Tone Pitch Discrimination
Willard R. Thurlow, S. Bernstein · The Journal of the Acoustical Society of America · 1957
The frequency separation between two simultaneously sounding tones necessary to give perception of two pitches has been investigated. Frequency levels of 200, 1000, 4000, 6000, and 10 000 cps were used. For the two-ear condition (where one tone was led to one ear, the other tone to the other ear), no striking differences were found between results at sensation levels of 10, 30, and 50 db. When both tones were led to the same ear, results tended to approach the two-ear situation when masking and interaction effects were minimized. The relation of the two-ear results to localization is discussed. Finally special phenomena are described which arise when two low frequencies, related by simple multiples, are used in the two-ear situation.