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Ear and contralateral masker effects on auditory temporal gap detection thresholds.

Martha E Carmichael¹, Susan E Hall, Dennis P Phillips

¹Hearing Research Laboratory, Department of Psychology, Dalhousie University, Halifax, NS, Canada B3H 4J1.

Hearing Research

|September 2, 2008

Summary

This study investigated auditory temporal resolution using gap detection tasks. No significant ear differences were found, suggesting that temporal acuity for gap detection does not explain left hemisphere language dominance.

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Area of Science:

Auditory Neuroscience
Cerebral Lateralization
Psychoacoustics

Background:

Left hemisphere dominance for language is often attributed to a temporal processing advantage.
Temporal acuity, measured by gap detection, is a key aspect of temporal processing.
Previous research on ear advantages for within-channel gap detection is conflicting, and between-channel gap detection has not been studied for ear differences.

Purpose of the Study:

To investigate ear differences in within-channel and between-channel gap detection.
To examine the effect of contralateral masking noise on temporal gap detection thresholds.
To determine if temporal acuity differences between ears could explain left hemisphere language dominance.

Main Methods:

Employed within-channel and between-channel gap detection tasks.
Utilized three contralateral masking conditions: no noise, continuous noise, and interrupted noise.
Used an adaptive tracking procedure to measure minimal detectable gap thresholds at each ear.

Main Results:

Masking noise significantly affected gap detection thresholds in both tasks.
Within-channel gap thresholds were longer in interrupted noise for both ears.
Between-channel gap thresholds were shorter in interrupted noise at the left ear (trend at right ear).
No significant differences in gap detection thresholds were found between the left and right ears under any condition.

Conclusions:

The findings do not support the hypothesis that a temporal processing advantage, specifically in gap detection acuity, underlies left hemisphere language dominance.
Auditory temporal resolution, as measured by gap detection, appears to be bilaterally represented.
Further research is needed to explore other potential temporal processing mechanisms contributing to language lateralization.