Working Memory in Pediatric Epilepsy: A Systematic Review and Meta-Analysis

Area of Science:

• Neuroscience
• Cognitive Psychology
• Pediatric Neurology

Background:

• Working memory is a critical cognitive system comprising multiple components.
• Baddeley's model identifies four key components: phonological loop, visuo-spatial sketchpad, central executive, and episodic buffer.
• Understanding working memory deficits in pediatric epilepsy is crucial for intervention.

Purpose of the Study:

• To systematically review and quantify working memory deficits in pediatric epilepsy.
• To investigate the pattern of these deficits across different working memory components.
• To explore the relationship between seizure focus and working memory impairment.

Main Methods:

• Systematic review adhering to PRISMA guidelines.
• Inclusion of 65 studies examining working memory in children with epilepsy.
• Meta-analysis to determine the effect size of working memory impairments.

Main Results:

• Significant impairments were found in the phonological loop (g = 0.739), visuo-spatial sketchpad (g = 0.521), and central executive (g = 0.560).
• The episodic buffer component was not assessed in the reviewed studies.
• The pattern of working memory deficits varied depending on the location and side of the seizure focus.

Conclusions:

• Children with epilepsy exhibit widespread working memory impairments.
• The specific location of seizure activity influences the type and severity of working memory deficits.
• These findings highlight the differential vulnerability of working memory components to focal epilepsy in developing brains.