Frequency microstructure of pitch-level functions

In a previous paper [E. M. Burns, J. Acoust. Soc. Am. Suppl. 1 77, S95 (1985)], the finding of no correlation between the frequency microstructure of the absolute threshold, associated with the presence of otoacoustic emissions, and the form of pitch-level functions measured at various points on the threshold microstructure was reported. In the experiments reported in this paper, pitch-level functions are measured at finer (20-Hz) frequency intervals. Cyclical changes in the magnitude and direction of the low-level portions (20–40 dB SPL) of the pitch-level functions that correlate strongly with the approximately cyclical changes in threshold microstructure are found. [Work supported by NINCDS.]