Pre- and postovulatory auditory brainstem response in normal women

Area of Science:

• Neuroscience
• Audiology
• Reproductive Endocrinology

Background:

• Conflicting reports exist regarding ovarian hormones and auditory brainstem response (ABR) in women.
• Women generally exhibit shorter ABR compared to men, suggesting hormonal influences.

Purpose of the Study:

• To compare ABR between the pre- and postovulatory phases of the menstrual cycle in healthy female volunteers.
• To investigate the potential role of ovarian hormones in modulating auditory pathway function.

Main Methods:

• 40 healthy female volunteers participated, with ABR recorded in pre- and postovulatory phases.
• Ovulation was estimated using basal body temperature measurements.
• Standardized auditory stimulation and recording protocols were employed using Neuropack and ELEGA equipment.

Main Results:

• Shorter ABR wave V latency (p < 0.01) and inter-peak latencies III-V (p < 0.05) and I-V (p < 0.05) were observed in the postovulatory phase.
• A general decreasing trend in other wave and inter-peak latencies was noted in the postovulatory phase.
• These findings indicate improved auditory pathway function in the postovulatory phase.

Conclusions:

• Auditory brainstem response appears to be enhanced in the postovulatory phase compared to the preovulatory phase.
• Progesterone, a key hormone in the postovulatory phase, may play a role in modulating the auditory hearing pathway.
• This study highlights the dynamic influence of the menstrual cycle on auditory processing.