Data from: The effect of interaural timing on the posterior auricular muscle reflex in normal adult volunteers

The posterior auricular muscle (PAM) reflex to sounds has been used
clinically to determine hearing threshold as an alternative to other
audiological diagnostic measures such as the auditory brainstem response.
We have shown that the PAM response is also sensitive to interaural timing
differences in normally hearing adults. PAM responses were evoked by both
ipsilateral/ contralateral monaural stimulation and by binaural
stimulation. Introducing sound delays ipsilaterally or contralaterally
decreased the PAM response amplitude and increased its latency. The PAM
response in this study shows a qualitatively similar pattern to that seen
by the binaural interaction component (BIC) of the auditory brainstem
potential to binaural clicks described in previous studies, in that both:
have their shortest latency and maximal amplitudes centered around zero
interaural timing differences, have response latencies increase with
increasing interaural delays up to 1.2 ms and have response amplitudes
decrease with increasing interaural delays of up to 1.2 ms. Our data show
that the PAM response may be useful in measuring binaural integration in
humans non-invasively for diagnostic or research studies.