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Related Experiment Videos

A developmental look at an auditory illusion: the precedence effect.

R K Clifton, B A Morrongiello, J M Dowd

Developmental Psychobiology

|September 1, 1984

Summary

Two-month-old infants can localize single sounds but not complex precedence-effect sounds. Six-month-olds successfully localize both, indicating developmental changes in auditory perception and sound localization abilities.

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Area of Science:

Auditory Neuroscience
Developmental Psychology
Psychoacoustics

Background:

Sound localization is crucial for infant development.
The precedence effect is a complex auditory phenomenon impacting sound localization.
Infant auditory processing undergoes rapid developmental changes.

Purpose of the Study:

To investigate the development of sound localization in infants using the precedence effect.
To determine the age at which infants can perceive the precedence effect.
To explore age-related differences in auditory behavioral responses.

Main Methods:

Infants aged 2 and 6 months were tested with single-source and precedence-effect auditory stimuli.
Head-turning responses were measured to assess sound localization.

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Stimuli included single loudspeaker sounds and binaural sounds with a 7 msec delay.

Main Results:

Six-month-old infants localized precedence-effect stimuli similarly to single-source stimuli.
Two-month-old infants localized single-source sounds but failed to localize precedence-effect sounds.
Head-turning responses were more difficult to elicit in younger infants, with human voice stimuli being more effective than click trains.

Conclusions:

The ability to perceive the precedence effect develops between 2 and 6 months of age.
Developmental changes in auditory behavior are linked to the maturation of the auditory cortex.
Infant sound localization abilities show significant development within the first six months of life.