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Lateralization

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Related Experiment Video

Updated: May 7, 2026

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Published on: October 24, 2012

Mapping a lateralization gradient within the ventral stream for auditory speech perception.

Karsten Specht¹

¹Department of Biological and Medical Psychology, University of Bergen Bergen, Norway ; Department for Medical Engineering, Haukeland University Hospital Bergen, Norway.

Frontiers in Human Neuroscience

|October 10, 2013

Summary

This summary is machine-generated.

Speech comprehension involves bilateral temporal lobe processing. However, a leftward lateralization gradient emerges from auditory-phonetic to lexico-semantic tasks, particularly in the superior temporal sulcus.

Keywords:

auditory perception fMRI speech perception temporal lobe ventral stream

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Area of Science:

Neuroscience
Cognitive Science
Psycholinguistics

Background:

Speech perception models propose dual-stream networks (dorsal and ventral).
The ventral stream is crucial for auditory-phonetic and lexico-semantic processing.
Understanding the hierarchical processing network for speech comprehension is essential.

Purpose of the Study:

To investigate the hierarchical processing network for speech comprehension.
To examine the role of the temporal lobe and ventral stream in speech processing.
To map hemispheric involvement and lateralization gradients in speech comprehension.

Main Methods:

Functional magnetic resonance imaging (fMRI) studies.
Analysis of complementary studies to trace hierarchical processing.
Focus on temporal lobe and ventral stream activity during speech tasks.

Main Results:

Bilateral temporal lobe involvement in speech signal processing.
An increasing leftward asymmetry from auditory-phonetic to lexico-semantic processing.
A posterior-anterior "lateralization" gradient observed along the temporal lobe, especially in the superior temporal sulcus.

Conclusions:

Speech comprehension is a bilateral process with significant leftward lateralization.
The temporal lobe exhibits a gradient of lateralization during speech processing.
Findings support a hierarchical model of speech comprehension within a dual-stream network.