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Wednesday, July 10 • 10:50 - 11:10
ESTIMATES OF RIPPLED SPECTRUM RESOLUTION BASED ON VARIOUS MEASUREMENT PARADIGMS

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Rippled-spectrum signals are used to measure resolution of spectro-temporal resolution of auditory stimuli in hearing-impaired listeners and cochlear-implant users. There is no commonly accepted paradigm for such measurements: different types of test and comparison signals were used in a variety of studies. Test stimuli were (i) rippled-spectrum signals with ripple phase changes during the signal; (ii) constant-phase rippled-spectrum signal that differed from the comparison signal by ripple phase; (iii) signals with gliding ripple patterns. Comparison stimuli were either rippled or non-rippled signals. In the present study, estimates or ripple-density resolution obtained in different experimental paradigms were compared. The results were as follows. (i) Detection of ripple-pattern change in the test signals resulted in better ripple-pattern resolution (up to 10 ripples/oct) than comparison of the test and reference signals differing by their ripple phase (less than 7 ripples/oct. (ii) For test signals with gliding ripple patterns, the ripple-density resolution depended on gliding velocity: from 7 ripples/oct at a velocity of 10-11 oct/s to 1 ripple/oct at a velocity approaching 400 oct/s. (iii) For reference signals with non-rippled spectra, the ripple density resolution was up to 26 ripples/oct which was several times as high as that for rippled reference signals (8-9 ripples/oct). The differences might appear due to exploiting different cues for discrimination between test and reference signals. In particular, discrimination between rippled test and rippled reference signals may be explained based on the excitation-pattern model, whereas high ripple-density resolution for discrimination between rippled test and non-rippled reference signals as well as ripple-pattern discrimination at high gliding velocities may be better explained basing on the temporal-processing model.

Moderators
BJ

Benoît Jutras

Professeur titulaire, Université de Montréal

Authors

Wednesday July 10, 2019 10:50 - 11:10 EDT
Outremont 6
  T09 Audiology… & comm. in noise, RS01 Psycholog & physiolog ac

Attendees (3)