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Related Concept Videos

Lateralization01:28

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
Higher Mental Functions of the Brain: Language01:10

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Lobes of the Cerebrum01:22

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Frontal lobe
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Evaluation of Hemisphere Lateralization with Bilateral Local Field Potential Recording in Secondary Motor Cortex of Mice
07:03

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Published on: July 31, 2019

Subcortical laterality of speech encoding.

Jane Hornickel1, Erika Skoe, Nina Kraus

  • 1Auditory Neuroscience Lab., Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, Evanston, IL, USA. j-hornickel@northwestern.edu

Audiology & Neuro-Otology
|January 6, 2009
PubMed
Summary

This study reveals that the brainstem processes speech sounds, like the syllable /da/, with a leftward bias. This auditory brainstem lateralization is crucial for distinguishing speech elements.

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Area of Science:

  • Auditory Neuroscience
  • Neurophysiology
  • Speech Processing

Background:

  • Language processing is typically left-lateralized in the brain.
  • Evidence suggests auditory brainstem lateralization may also exist.

Purpose of the Study:

  • To investigate speech-specific lateralization in the auditory brainstem.
  • To determine if auditory processing of speech elements shows hemispheric differences in the brainstem.

Main Methods:

  • Electrophysiological responses (frequency following response - FFR) were recorded from the brainstem.
  • Adults with symmetrical click-evoked responses were presented with the syllable /da/ to either the right or left ear.
  • Interaural and interpeak latencies were analyzed.

Main Results:

  • Responses to right-ear stimulation occurred earlier than left-ear stimulation in early FFR peaks.
  • Frequency encoding was more robust for right-ear stimulation, particularly for formant-related harmonics.
  • No differences in interpeak latencies were observed, suggesting a general timing shift.

Conclusions:

  • Left lateralization of speech sound processing extends to the auditory brainstem.
  • This brainstem lateralization is specific to speech stimuli and important for speech discrimination.