Abstract
A replication of the Efron-Yund study [R. Efron and E. W. Yund, Neuropsychologia 12, 249–256 (1974)] was accomplished and findings were in close agreement with those of the original investigators: When subjects receive dichotic stimulation by steady-state tone bursts of equal intensity but differing frequency, pitch extraction of the resulting chord is usually dominated by the frequency going to one ear resulting in an ear advantage for pitch. A series of linearly rising tone glides was constructed with center frequencies equal to the values used for pure-tone testing, and substituted into the design so that the glides went to the nondominant ear. For most subjects, the effect is to decrease the observed ear dominance and the degree of change is predicted by the amount of frequency change of the glide stimulus. An interpretation invoking the activation of receptor cells tuned to changes in acoustic stimulation is developed.
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