Otoacoustic emissions but not behavioral measurements predict cochlear-nerve frequency tuning in an avian vocal-communication specialist

The current paradigm in auditory research is the power spectrum model of masking. The dominant theory is that behavioral frequency selectivity measurements should roughly correspond to cochlear frequency tuning, at least at lower sound levels. This assumes that the behavioral responses are largely driven by cochlear processes.

This preprint investigates the relationship between behavioral, otoacoustic emission (SFOAE), and auditory-nerve tuning measures in budgerigars. While SFOAE and auditory nerve measurements align with the general paradigm of monotonically increasing tuning sharpness with higher frequencies, behavioral data collected in earlier studies showed a peak in tuning at 3.5-4 kHz and considerably sharper tuning than predicted by SFOAEs and ANF tuning. These findings challenge the direct link between behavioral and cochlear tuning assumed by the established paradigm and call for more caution in interpreting behavioral results, while simultaneously suggesting possible specialized central processing in the budgerigar. The research uses established methodologies within the existing paradigm to challenge a specific aspect, but it doesn't represent a paradigm shift or crisis. It fits clearly within normal science, as it explores and potentially refines an existing paradigm.