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Related Experiment Video

Updated: May 25, 2026

Infant Auditory Processing and Event-related Brain Oscillations

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Processing simultaneous auditory objects: infants' ability to detect mistuning in harmonic complexes.

Nicole A Folland¹, Blake E Butler, Nicholas A Smith

¹Department of Psychology, Neuroscience and Behaviour, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4L8, Canada.

The Journal of the Acoustical Society of America

|January 28, 2012

Summary

This summary is machine-generated.

Six-month-old infants can distinguish complex tones with mistuned harmonics. This suggests infants can perceptually separate simultaneous sounds, crucial for auditory development.

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Area of Science:

Auditory Neuroscience
Developmental Psychology
Psychoacoustics

Background:

Auditory object perception is vital for infant development, especially in music.
Limited research exists on how infants process simultaneous sounds.
Music perception relies on separating harmonic elements.

Purpose of the Study:

To investigate if 6-month-old infants can discriminate complex tones with mistuned harmonics.
To determine if infants can separate simultaneous auditory objects.

Main Methods:

Utilized a conditioned head-turn procedure with 6-month-old infants.
Presented a complex tone and a mistuned harmonic variant.
Tested discrimination at various mistuning percentages (8%, 6%, 4%, 2%).

Main Results:

Infants performed above chance for 8%, 6%, and 4% mistunings.
Performance at 2% mistuning was not significantly different from chance.
Infant performance at 2% was significantly worse than at larger mistuning levels.

Conclusions:

6-month-old infants are sensitive to harmonic structure violations.
Infants demonstrate the ability to separate two simultaneously presented auditory objects.
Findings support early development of auditory scene analysis skills.