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The Influence of Stimulus Repetition Rate on Tone-Evoked Post-Auricular Muscle Response (PAMR) Threshold

Zakaria, Mohd Normani; Abdullah, Rosninda; Nik Othman, Nik Adilah

doi: 10.1097/AUD.0000000000000676
Brief Report: PDF Only

Objectives: Post-auricular muscle response (PAMR) is a large myogenic potential that can be useful in estimating behavioral hearing thresholds when the recording protocol is optimal. The main aim of the present study was to determine the influence of stimulus repetition rate on PAMR threshold.

Design: In this repeated-measures study, 20 normally hearing adults aged between 18 and 30 years were recruited. Tone bursts (500, 1000, 2000, and 4000 Hz) were used to record PAMR thresholds at 3 different stimulus repetition rates (6.1/s, 11.1/s, and 17.1/s).

Results: Statistically higher PAMR thresholds were found for the faster stimulus rate (17.1/s) compared with the slower stimulus rate (6.1/s) (p < 0.05). For all stimulus rates and frequencies, significant correlations were found between PAMR and pure-tone audiometry thresholds (r = 0.62 to 0.82).

Conclusions: Even though the stimulus rate effect was significant at most of the tested frequencies, the differences in PAMR thresholds between the rates were small (<5 dB). Nevertheless, based on the correlation results, we suggest the use of 11.1/s stimulus rate when recording PAMR thresholds.

Audiology and Speech Pathology Programme, School of Health Sciences, Universiti Sains Malaysia, Kelantan, Malaysia.

ACKNOWLEDGMENTS: >This study was part of a research project funded by Short Term Grant (P4122), Universiti Sains Malaysia.

The authors have no conflicts of interest to disclose.

Address for correspondence: Mohd Normani Zakaria, Audiology and Speech Pathology Programme, School of Health Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan, Malaysia. E-mail:

Received October 15, 2017; accepted September 18, 2018.

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