Abstract
When periodically phase-reversed sinusoids are presented to a subject at levels successively raised above auditory threshold, the first perception is of a faint, pure tone. At higher levels a “roughness” is sensed, followed at still higher levels by detectable sidebands. Subjects can match successively the pitches of components of the sidebands; usually, however, just either the sum or difference components are noticed. When reversals occur within just a few periods, the sidebands begin to dominate, but the sensation of the central tone returns if white noise is applied at the contralateral ear. At still shorter intervals between reversals, the central tone can be sensed only at high test levels.
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