The click-evoked post-auricular myogenic response in normal subjects

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Physiology

Background:

• The posterior auricular myogenic reflex (PMR) is a physiological response to auditory stimuli.
• Previous research has yielded inconsistent findings regarding the prevalence and laterality of PMR.
• Understanding PMR contributes to the broader study of auditory processing and brainstem pathways.

Purpose of the Study:

• To investigate the presence and characteristics of the posterior auricular myogenic reflex in healthy human subjects.
• To determine the prevalence of bilateral auditory reception via PMR.
• To explore factors influencing PMR, such as body position and facial expressions.

Main Methods:

• Click stimuli were presented alternately to each ear in 45 healthy participants.
• Both ipsilateral and contralateral PMR responses were recorded simultaneously.
• The influence of smiling and head-down positions on reflex responses was assessed.

Main Results:

• The posterior auricular myogenic reflex was detected in the majority of subjects studied.
• Smiling and head-down positions were observed to increase the number of PMR responses.
• Bilateral auditory reception was demonstrated in 89% of the participants, a higher prevalence than previously reported.

Conclusions:

• The posterior auricular myogenic reflex is a reliable indicator of auditory processing.
• Bilateral auditory pathways are frequently engaged by auditory stimuli, as evidenced by PMR.
• Positional and expressive factors can modulate the posterior auricular myogenic reflex, suggesting central nervous system involvement.