Association Between Gray Matter Volume Variations and Energy Utilization in the Brain: Implications for Developmental...

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• The biological basis of developmental stuttering is not fully understood.
• Previous research indicated a link between brain structural anomalies and genes involved in energy metabolism in stuttering.

Purpose of the Study:

• To investigate the relationship between brain structural anomalies and regional energy metabolism in children with persistent developmental stuttering.
• To build upon prior findings suggesting a connection between genetic factors, brain structure, and energy metabolism in stuttering.

Main Methods:

• Acquired high-resolution structural MRI scans from 26 children with persistent stuttering and 44 typically developing children.
• Utilized voxel-based morphometry to compare gray matter volume (GMV) differences between groups.
• Compared GMV differences with published F18-fluorodeoxyglucose (FDG) uptake data, a measure of glucose metabolism, from 29 healthy volunteers.

Main Results:

• A significant positive correlation was observed between GMV differences and F18-FDG uptake in the left hemisphere (ρ = .36, p < .01).
• This correlation was found in brain regions typically associated with speech-motor and language processing.
• No significant correlation was found in the right hemisphere (ρ = .05, p = .70).

Conclusions:

• The findings suggest a link between brain energy metabolism and stuttering, supporting previous gene expression studies.
• Brain regions with high energy utilization may be more susceptible to the anatomical changes seen in stuttering.
• Increased brain energy demands during childhood development, coinciding with speech acquisition, may exacerbate these structural changes.