Abstract
Albert Feng was a prominent comparative neurophysiologist whose research provided numerous contributions towards understanding how the spectral and temporal characteristics of vocalizations underlie sound communication in frogs and bats. The present study is dedicated to Al’s memory and compares the spectral and temporal representations of stochastic, complex sounds which underlie the perception of pitch strength in humans and chinchillas. Specifically, the pitch strengths of these stochastic sounds differ between humans and chinchillas, suggesting that humans and chinchillas may be using different cues. Outputs of auditory filterbank models based on human and chinchilla cochlear tuning were examined. Excitation patterns of harmonics are enhanced in humans as compared with chinchillas. In contrast, summary correlograms are degraded in humans as compared with chinchillas. Comparing summary correlograms and excitation patterns with corresponding behavioral data on pitch strength suggests that the dominant cue for pitch strength in humans is spectral (i.e., harmonic) structure, whereas the dominant cue for chinchillas is temporal (i.e., envelope) structure. The results support arguments that the broader cochlear tuning in non-human mammals emphasizes temporal cues for pitch perception, whereas the sharper cochlear tuning in humans emphasizes spectral cues.
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Acknowledgements
Although I was not the first graduate student to join Al’s lab, I was his first graduate student from the physiology program in what was then Department of Physiology and Biophysics at the University of Illinois at Urbana-Champaign. So, it is a particular honor for me to have been invited to contribute to this special issue honoring Al, and I would like to thank Peter Narins for the invitation.
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Shofner, W.P. Cochlear tuning and the peripheral representation of harmonic sounds in mammals. J Comp Physiol A 209, 145–161 (2023). https://doi.org/10.1007/s00359-022-01560-3
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DOI: https://doi.org/10.1007/s00359-022-01560-3