Language lateralization in young children assessed by functional transcranial Doppler sonography

Area of Science:

• Neuroscience
• Developmental Psychology
• Medical Imaging

Background:

• Children exhibit better language recovery post-brain injury than adults.
• Understanding language lateralization in children is key to deciphering young brain repair.
• Functional magnetic resonance imaging (fMRI) is challenging for children under five.

Purpose of the Study:

• To validate functional transcranial Doppler sonography (fTCD) for assessing language lateralization in children.
• To determine the reliability of a new picture-description language task (PDLT) for fTCD in pediatric subjects.
• To compare fTCD results with established methods for language lateralization.

Main Methods:

• Developed and tested a picture-description language task (PDLT) for fTCD in 16 children (aged 2-9).
• Measured hemispheric perfusion differences using cerebral blood flow velocity (CBFV) in middle cerebral arteries.
• Compared PDLT fTCD results with a phonetic word generation task (PWGT) in adults and assessed 1-month retest-reliability.

Main Results:

• The PDLT showed good intermethod validity when compared to adult PWGT (r=0.70).
• The 1-month retest-reliability of the PDLT in children was high (r=0.87).
• fTCD is a valid and reliable tool for assessing language lateralization in young children.

Conclusions:

• Functional transcranial Doppler sonography (fTCD) is a promising, noninvasive tool for pediatric brain research.
• The PDLT provides reliable assessment of language lateralization in children aged 2-9 years.
• fTCD can facilitate serial examinations for tracking brain changes in young children.