Brain development differences both predict and result from adolescent substance use
A systematic review of 38 longitudinal studies found that delayed executive functioning and emotional perception may predispose adolescents to substance use, while use itself causes further functional, structural, and cognitive deficits.
Quick Facts
What This Study Found
High-quality evidence showed that delayed or irregular neurodevelopment in executive functioning, particularly emotional perception, may predispose young people to higher frequency substance use. The review also found evidence of functional, structural, and cognitive deficits following substance use, with harm potentially dependent on frequency and recovery potentially dependent on duration of use.
Key Numbers
38 longitudinal studies included; 22 neuroimaging studies, 2 neurophysiological, 22 neuropsychological; age range 10-25 years; five databases searched
How They Did This
Systematic review searching five databases for longitudinal studies examining neuropsychological, neuroimaging, or neurophysiological predictors and consequences of cannabis and illicit substance use in individuals aged 10-25. Yielded 38 eligible studies covering 22 neuroimaging, 2 neurophysiological, and 22 neuropsychological findings.
Why This Research Matters
Separating what comes before substance use (predisposing brain differences) from what comes after (use-caused damage) is essential for designing effective prevention. If certain neurodevelopmental patterns predict who will use substances, early identification and intervention become possible.
The Bigger Picture
The bidirectional relationship between brain development and substance use creates a potential vicious cycle: developmental differences increase vulnerability to use, and use further disrupts development. Breaking this cycle requires addressing both the predisposing factors and the substance use itself.
What This Study Doesn't Tell Us
Heterogeneous study designs and measures across the 38 included studies. Most studies combined cannabis with other substances, making it difficult to isolate cannabis-specific effects. Longitudinal designs varied in follow-up duration.
Questions This Raises
- ?Can early screening for executive functioning delays identify at-risk youth before substance initiation?
- ?How much recovery is possible after cessation, and what determines the extent of recovery?
Trust & Context
- Key Stat:
- 38 longitudinal studies spanning neuroimaging, neurophysiology, and neuropsychology
- Evidence Grade:
- Systematic review of longitudinal studies published in a high-impact journal (The Lancet Child & Adolescent Health), providing strong evidence for the bidirectional relationship.
- Study Age:
- Published in 2021.
- Original Title:
- Neuropsychological and neurophysiological predictors and consequences of cannabis and illicit substance use during neurodevelopment: a systematic review of longitudinal studies.
- Published In:
- The Lancet. Child & adolescent health, 5(8), 589-604 (2021)
- Authors:
- Debenham, Jennifer(5), Birrell, Louise(4), Champion, Katrina(2), Lees, Briana, Yücel, Murat, Newton, Nicola
- Database ID:
- RTHC-03094
Evidence Hierarchy
Analyzes all available research on a topic using a structured method.
What do these levels mean? →Frequently Asked Questions
Do brain differences come before or after substance use?
Both. The review found that pre-existing differences in executive functioning and emotional perception predispose adolescents to substance use, and substance use then causes additional functional, structural, and cognitive deficits.
Can the brain recover after stopping?
There was evidence of recovery potential, but it appeared dependent on the duration of use. Shorter periods of use were associated with better recovery prospects, while longer use may cause more persistent damage.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-03094APA
Debenham, Jennifer; Birrell, Louise; Champion, Katrina; Lees, Briana; Yücel, Murat; Newton, Nicola. (2021). Neuropsychological and neurophysiological predictors and consequences of cannabis and illicit substance use during neurodevelopment: a systematic review of longitudinal studies.. The Lancet. Child & adolescent health, 5(8), 589-604. https://doi.org/10.1016/S2352-4642(21)00051-1
MLA
Debenham, Jennifer, et al. "Neuropsychological and neurophysiological predictors and consequences of cannabis and illicit substance use during neurodevelopment: a systematic review of longitudinal studies.." The Lancet. Child & adolescent health, 2021. https://doi.org/10.1016/S2352-4642(21)00051-1
RethinkTHC
RethinkTHC Research Database. "Neuropsychological and neurophysiological predictors and con..." RTHC-03094. Retrieved from https://rethinkthc.com/research/debenham-2021-neuropsychological-and-neurophysiological-predictors
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.