Age and sex differences in the human auditory brainstem response

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Gerontology

Background:

• Brainstem Auditory Evoked Response (BAER) is a non-invasive electrophysiological measure of auditory pathway function.
• Auditory processing changes with age and can differ between sexes.
• Understanding these differences is crucial for diagnosing hearing impairments and neurological conditions.

Purpose of the Study:

• To investigate age-related and sex-related differences in Brainstem Auditory Evoked Response (BAER) latencies.
• To identify specific brainstem auditory pathways affected by aging and sex.

Main Methods:

• BAERs were recorded from young (20-39 yrs), middle-aged (40-59 yrs), and older adults (60-79 yrs).
• Stimuli included clicks at 60, 70, and 80 dB(SL) with presentation rates of 5, 10, and 15 clicks/sec.
• Ten males and ten females were included in each age group.

Main Results:

• Older adults demonstrated significantly longer latencies for Wave III compared to younger groups.
• Age effects on Waves I, II, and IV were observed at lower intensities, more pronounced in older males.
• Females consistently showed shorter latencies for Waves IV and V than males across all age groups.

Conclusions:

• Aging impacts neural signal propagation in the brainstem auditory pathway, specifically at the level of the olivary complex (Wave III).
• BAER latencies are influenced by both the individual's age and sex.
• These findings highlight the importance of considering age and sex when interpreting BAER results.