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Related Concept Videos

Lateralization01:28

Lateralization

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.
Cerebral Hemispheres01:05

Cerebral Hemispheres

The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...

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Related Experiment Video

Updated: Jun 20, 2026

Assessment of Cerebral Lateralization in Children using Functional Transcranial Doppler Ultrasound (fTCD)
07:44

Assessment of Cerebral Lateralization in Children using Functional Transcranial Doppler Ultrasound (fTCD)

Published on: September 27, 2010

Language lateralization in children using functional transcranial Doppler sonography.

Anja Haag1, Nicola Moeller, Susanne Knake

  • 1Department of Neurology, University of Marburg, Germany. haag@staff.uni-marburg.de <haag@staff.uni-marburg.de>

Developmental Medicine and Child Neurology
|September 8, 2009
PubMed
Summary

Functional transcranial Doppler sonography (fTCD) is well-tolerated in children for assessing language dominance. However, the picture description task needs further evaluation for reliable language lateralization in pediatric populations.

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Last Updated: Jun 20, 2026

Assessment of Cerebral Lateralization in Children using Functional Transcranial Doppler Ultrasound (fTCD)
07:44

Assessment of Cerebral Lateralization in Children using Functional Transcranial Doppler Ultrasound (fTCD)

Published on: September 27, 2010

Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow
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Published on: March 15, 2021

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Cognitive Neuroscience

Background:

  • Language lateralization, the dominance of one brain hemisphere for language functions, is crucial for understanding brain organization.
  • Functional transcranial Doppler sonography (fTCD) and lexical word generation are established methods for assessing language dominance in adults.
  • Determining language dominance in children is essential for clinical and research purposes, but requires age-appropriate methods.

Purpose of the Study:

  • To evaluate a nonlexical paradigm, picture description, for determining language dominance in children using fTCD.
  • To compare the effectiveness of picture description with lexical word generation in adolescents for language lateralization.
  • To assess the tolerability and data quality of fTCD in pediatric populations.

Main Methods:

  • Cerebral blood flow velocity (CBFV) was measured using fTCD in 23 children (6-11 years) and 22 adolescents (12-18 years).
  • Participants performed a picture description task; adolescents also completed a lexical word generation task.
  • A lateralization index (LI) was computed based on CBFV differences between hemispheres during tasks.

Main Results:

  • Left hemispheric dominance was observed in 14/23 children and 14/21 adolescents during picture description.
  • A higher proportion of adolescents (20/21) showed left hemispheric dominance during lexical word generation.
  • Variability of the LI across task repetitions was similar between age groups and paradigms.

Conclusions:

  • Functional TCD is well-tolerated and provides comparable data quality in children and adolescents.
  • The picture description paradigm demonstrated limitations in consistently identifying left hemispheric language dominance in children.
  • Further research is needed to develop and validate effective nonlexical paradigms for fTCD-based language lateralization in pediatric populations.