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Related Experiment Video

Updated: Oct 12, 2025

Determining Ultrasonic Vocalization Preferences in Mice using a Two-choice Playback Test

Determining Ultrasonic Vocalization Preferences in Mice using a Two-choice Playback Test

Published on: September 3, 2015

Sex differences in auditory processing vary across estrous cycle.

Jennifer Krizman^1,2, Elena K Rotondo³, Trent Nicol^1,2

¹Auditory Neuroscience Laboratory, Northwestern University, Evanston, IL, 60208, USA.

Scientific Reports

|November 25, 2021

Summary

Female rodents exhibit enhanced sound harmonic encoding compared to males, particularly during high estrogen periods. This suggests estrogen influences auditory processing differences between sexes in mammals, potentially mirroring human mechanisms.

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Last Updated: Oct 12, 2025

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Area of Science:

Neuroscience
Auditory Neuroscience
Hormonal Influences on Auditory Processing

Background:

Human females demonstrate superior processing of sound harmonics compared to males.
Estrogen is known to modulate auditory plasticity in a sex-specific manner in certain animal species.
Estrogen signaling is a hypothesized mechanism for observed sex differences in human auditory processing.

Purpose of the Study:

To investigate if sex differences in harmonic encoding in mammals vary with the reproductive cycle.
To explore the role of estrogen in sex-specific differences in auditory processing.

Main Methods:

Frequency-following responses (FFRs) were recorded in male and female rats exposed to complex sounds.
Female rats' FFRs were analyzed during both low and high circulating estrogen phases of their estrous cycle.

Main Results:

Female rodents displayed more robust harmonic encoding than male rodents.
Increased harmonic strength in females correlated with periods of higher estrogen levels.
These findings indicate a link between estrogen levels and enhanced harmonic encoding in female rodents.

Conclusions:

Hormonal differences, specifically estrogen, underlie sex differences in harmonic encoding in rodents.
The results suggest that estrogen may also be responsible for sex-specific harmonic processing differences observed in humans.
This study provides evidence for a conserved hormonal mechanism influencing auditory processing across mammalian species.