Children exposed to cannabis prenatally had more attention problems, externalizing behaviors, and total behavioral problems at ages 9-10 compared to unexposed children, but showed no differences in cognitive performance or brain activation patterns on fMRI.
Obstetricians, pediatricians, developmental researchers, and parents.
Behavioral problems without cognitive or brain scan differences
What the researchers found
Compared to both control groups, children with prenatal cannabis exposure (PCE) had significantly higher attention problems, externalizing, and total problem scores on the Child Behavior Checklist. However, PCE did not affect cognitive performance on response inhibition, reward processing, or working memory tasks, and showed no differences in brain activation patterns during fMRI.
Why it matters
Using the largest adolescent brain development study in the world, this research shows that prenatal cannabis exposure is associated with behavioral but not cognitive or neuroimaging differences by age 10, though later effects may emerge.
The numbers in context
224 children with PCE from ~12,000 ABCD Study participants. Significant increases in attention problems, externalizing, and total problem scores. No differences on three cognitive tasks or fMRI activation patterns.
How the study worked
Data from the ABCD Study (approximately 12,000 children). 224 children with PCE (reported by caregivers) compared to two control groups: tobacco/alcohol-matched and unexposed. Behavioral outcomes from CBCL at ages 9-10. Cognitive and fMRI measures from three tasks: Stop Signal (response inhibition), MID (reward), and EN-Back (working memory).
What this study cannot tell us
Caregiver-reported PCE may underestimate exposure. Cannot control for all confounders (genetics, postnatal environment). Cross-sectional analysis at one age point. fMRI tasks may not be sensitive enough. Children are still developing.
How to read the evidence
Large population-based cohort (ABCD Study) with multimodal assessment, though observational design limits causal claims.
When this study was published
Published in 2022 using ABCD Study baseline data (ages 9-10).
The bigger picture
The disconnect between behavioral problems and normal cognitive/neuroimaging findings mirrors the broader ADHD literature, where fewer than half of children with attention problems show specific cognitive deficits, suggesting behavioral impacts operate through mechanisms not captured by standard cognitive tests.
Questions still open
- Will cognitive and brain differences emerge as these children mature through adolescence? Are the behavioral problems due to direct cannabis effects or shared family factors? Would more sensitive neuroimaging detect subtle differences?
Common questions
Does prenatal cannabis exposure affect children's brains?
What behavioral problems were found?
Read the original research
Prenatal cannabis exposure predicts attention problems, without changes on fMRI in adolescents.
Neurotoxicology and teratology, 91, 107089
Citation
Cioffredi, Leigh-Anne; Anderson, Hillary; Loso, Hannah; East, James; Nguyen, Philip; Garavan, Hugh; Potter, Alexandra. (2022). Prenatal cannabis exposure predicts attention problems, without changes on fMRI in adolescents.. Neurotoxicology and teratology, 91, 107089. https://doi.org/10.1016/j.ntt.2022.107089
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