Rising-frequency chirps and earphones with an extended high-frequency response enhance the post-auricular muscle response

Katrina Agung*, Suzanne C. Purdy, Robert B. Patuzzi, Greg A. O'Beirne, Philip Newall

*Corresponding author for this work

Research output: Contribution to journalArticle

13 Citations (Scopus)


The purpose of this study was to determine whether rising-frequency chirps presented via earphones with an extended high-frequency response would optimize the post-auricular muscle response (PAMR). The PAMR was recorded in adults using three different stimuli (a click, a rising-frequency chirp, and a truncated speech stimulus, /t/). Conventional ER-3A insert earphones were compared to ER-2 insert earphones to determine whether the PAMR is enhanced by the ER-2's extended high-frequency response. There were significant stimulus and earphone effects on PAMR amplitudes. The PAMR was largest for the chirp stimulus and the ER-2 earphones. The poorest responses were obtained using the /t/ stimulus and conventional ER-3A earphones. The results support previous ABR studies that have demonstrated a significant advantage of chirps over clicks for evoked response audiometry, and indicate that the PAMR is enhanced by inclusion of additional high-frequency stimulus energy.

Original languageEnglish
Pages (from-to)631-636
Number of pages6
JournalInternational Journal of Audiology
Issue number11
Publication statusPublished - Nov 2005


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