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Hemispheric differences in specificity effects in talker identification.

Julio González¹, Teresa Cervera-Crespo, Conor T McLennan

¹Dpt. Psicología Básica, Clínica y Psicobiología, Universitat Jaume I, 12071-Castellón de la Plana, Spain. gonzalez@psb.uji.es

Attention, Perception & Psychophysics

|November 25, 2010

Summary

Brain hemispheres process auditory information differently. The right hemisphere shows specific priming effects for talker identification, suggesting a general perceptual processing asymmetry.

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Area of Science:

Neuroscience
Cognitive Psychology
Auditory Perception

Background:

Previous research suggests dissociable neural subsystems for object/shape recognition in the visual domain, with hemispheric asymmetries.
Prior studies indicated similar asymmetries for auditory priming of linguistic and nonlinguistic stimuli.

Purpose of the Study:

To investigate hemispheric asymmetries in talker identification using long-term repetition priming.
To determine if auditory priming effects mirror those observed in the visual domain.

Main Methods:

Two long-term repetition-priming experiments involving familiarization and talker identification phases.
Stimuli consisted of spoken sentences presented to either the left or right ear.

Main Results:

Specificity effects in talker identification (same-sentence vs. different-sentence priming) were observed when stimuli were presented to the left ear (right hemisphere).
No significant specificity effects were found when stimuli were presented to the right ear (left hemisphere).

Conclusions:

The findings demonstrate a right-hemisphere advantage for talker identification specificity, consistent with prior visual and auditory priming studies.
This consistent pattern across sensory domains suggests a general property of hemispheric asymmetry in human perceptual processing.