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Related Experiment Video

Updated: Jul 13, 2026

Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice

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Published on: July 31, 2019

Lateral response dynamics and hemispheric dominance for speech perception.

Michael D Hunter¹, Kwang-Hyuk Lee, Panna Tandon

¹Sheffield Cognition and Neuroimaging Laboratory, Academic Clinical Psychiatry, University of Sheffield, UK. m.d.hunter@shef.ac.uk

|July 17, 2007

Summary

The dominant left hemisphere processes speech by selectively responding over time. This temporal response pattern in the left auditory cortex, unlike the right, indicates its specialized role in speech perception.

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Area of Science:

Neuroscience
Auditory Neuroscience
Cognitive Neuroscience

Background:

The left cerebral hemisphere is known to be dominant for speech perception.
The precise neural mechanisms underlying this hemispheric dominance remain incompletely understood.

Purpose of the Study:

To investigate the neural mechanisms of left cerebral hemisphere dominance for speech perception.
To determine if selective temporal responding differentiates the dominant from the nondominant hemisphere during speech processing.

Main Methods:

Utilized the crossover of auditory pathways to present speech stimuli selectively to either the left or right cerebral hemisphere via the right and left ears, respectively.
Employed functional magnetic resonance imaging (fMRI) to measure neural response duration in the auditory cortex.
Compared neural response durations between hemispheres based on the ear of stimulus presentation.

Main Results:

Neural response duration in the left auditory cortex increased when speech information was presented directly to the left hemisphere (via the right ear).
Neural response duration in the right auditory cortex showed no significant modulation when speech information was presented directly to the right hemisphere (via the left ear).

Conclusions:

Selective temporal responding in the auditory cortex distinguishes the dominant (left) hemisphere from the nondominant (right) hemisphere during speech perception.
These findings support a model where temporal processing characteristics are key to hemispheric specialization in human speech perception.