Prenatal marijuana exposure impacts executive functioning into young adulthood: An fMRI study

Area of Science:

• Neuroscience
• Developmental Psychology
• Public Health

Background:

• Increasing marijuana use among pregnant women for morning sickness relief necessitates understanding long-term child development impacts.
• Previous research suggests prenatal marijuana exposure negatively affects executive functioning into adolescence.
• The long-term effects into young adulthood and their neural underpinnings require further investigation.

Purpose of the Study:

• To investigate if executive functioning deficits persist into young adulthood following prenatal marijuana exposure.
• To explore the neural basis of these potential effects using functional magnetic resonance imaging (fMRI).
• To assess the impact of prenatal marijuana exposure on brain activity during cognitive tasks in young adults.

Main Methods:

• Utilized data from the longitudinal Ottawa Prenatal Prospective Study (OPPS).
• Recruited 31 young adults (ages 18-22 years) with and without prenatal marijuana exposure.
• Administered four cognitive tasks (Visuospatial 2-Back, Go/NoGo, Letter 2-Back, Counting Stroop) while monitoring brain activity with fMRI.

Main Results:

• No significant differences in task performance were observed between the exposed and control groups.
• Significant differences in brain blood flow patterns were detected between the groups.
• Young adults with prenatal marijuana exposure exhibited consistently increased left posterior brain activity compared to controls.

Conclusions:

• Prenatal marijuana exposure is associated with altered neurophysiological functioning in young adulthood.
• These findings underscore the importance of educating women of childbearing age about potential risks.
• The results inform policymakers and healthcare providers regarding the welfare of pregnant women and their offspring.