Language in childhood epilepsy: A systematic review and meta-analysis

Area of Science:

• Neuroscience
• Developmental Psychology
• Pediatric Neurology

Background:

• Abnormal brain activity in childhood epilepsy can affect cognitive development, particularly language.
• Research on language abilities in children with epilepsy shows inconsistent findings regarding the presence and magnitude of differences.

Purpose of the Study:

• To systematically review and meta-analyze existing studies to determine the magnitude of language differences in children with epilepsy compared to typically developing children.
• To investigate potential moderators of these language differences, including seizure classification, age of onset, language component, and measurement instrument.

Main Methods:

• Systematic review and meta-analysis of 13 studies involving children with epilepsy and language assessments.
• Analysis of seizure classification, age of onset, language component (e.g., semantics, syntax, fluency), and measurement tools as potential moderators.

Main Results:

• A significant large effect size was found for language deficits in children with epilepsy compared to their peers.
• Seizure classification partially explained the variability in effect sizes.
• Effect sizes varied by language component, with semantic language and verbal fluency showing the largest deficits, while syntax showed minimal differences overall.
• Differences in effect size were also observed based on the instrument used to measure verbal fluency.

Conclusions:

• Children with epilepsy exhibit significant language deficits, with a large overall effect size.
• While seizure type influences language outcomes, it does not fully account for the observed deficits.
• Specific language components, such as semantics and verbal fluency, are more profoundly affected than others, like syntax.
• The choice of measurement instrument can impact the observed effect size for certain language skills.