Tonal Monaural Diplacusis

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Abstract
Two similar cases of tonal monaural diplacusis are described. When low-intensity sinusoids within a certain range were presented, several distinct tones were heard in addition to the tone presented. Effects were focussed at 3610 cps for one subject and at 3155 cps for the other. Pitch-matching and probe-tone techniques showed that the additional tones corresponded to combination tones expected in a normal ear stimulated by 2 tones, one of which is fixed at one of the above frequencies. Hence some basic instability of the auditory mechanism at these frequencies was indicated for these observers. It is suggested that the defect lies in the "peaking" process of the cochlea, so that an adequate explanation of the phenomena may be of some importance to auditory theory.

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