Brain Networks Linked to Poor Sustained Attention at Age 14 Predicted Cannabis and Cigarette Use by Age 23 | Research

The takeaway

Diminished sustained attention at age 14, identified through brain connectivity patterns, predicted increases in cannabis and cigarette smoking over the following nine years in more than 1,000 participants.

Neuroscience and addiction researchers; educators and prevention specialists working with adolescents.

9-year longitudinal follow-up from ages 14 to 23 in 1,000+ participants

What the researchers found

Brain connectivity patterns associated with poor sustained attention at age 14 predicted subsequent increases in cannabis and cigarette use through age 23. Individual differences in attention network strength were preserved across developmental stages and generalized to an external dataset.

Why it matters

This is among the first studies to establish that attention deficits precede cannabis use rather than resulting from it. Identifying a reliable brain biomarker for substance use vulnerability at age 14 could enable targeted prevention before cannabis initiation begins.

The numbers in context

Over 1,000 participants followed from ages 14 to 23. Brain networks of sustained attention at age 14 predicted cannabis and cigarette use increases. Network patterns were consistent across developmental stages and replicated in an external dataset.

How the study worked

Longitudinal study following over 1,000 participants from ages 14 to 23. Brain connectivity during sustained attention tasks was measured using neuroimaging. Attention network patterns at baseline were used to predict substance use trajectories. Results were validated against an external dataset.

What this study cannot tell us

Although longitudinal, the study cannot fully rule out unmeasured confounders that might independently affect both attention networks and substance use trajectories. The study examined attention broadly rather than parsing specific attention subtypes.

How to read the evidence

Strong: large longitudinal sample with neuroimaging, prospective prediction validated in an external dataset, and published in a rigorous peer-reviewed journal.

When this study was published

2024 study using longitudinal data spanning ages 14-23.

The bigger picture

The chicken-or-egg question in cannabis-cognition research has been: does cannabis impair attention, or do people with attention problems gravitate toward cannabis? This longitudinal evidence supports the latter, suggesting attention deficits may be a pre-existing vulnerability factor rather than purely a consequence of use.

Questions still open

Could attention network screening at age 14 practically identify at-risk youth for targeted prevention? Do different attention network profiles predict different substance use trajectories (e.g., cannabis vs. tobacco vs. alcohol)?

Common questions

Does this mean attention problems cause cannabis use?

The study shows that attention deficits at age 14 predict later cannabis use, but it does not prove direct causation. Other factors could contribute to both attention differences and substance use. However, the temporal sequence (attention deficits first, substance use later) is important.

Could this be used to screen teens?

The brain connectivity patterns identified were robust and consistent across development, suggesting theoretical screening potential. However, translating neuroimaging findings into practical clinical screening tools faces significant cost and logistical challenges.

Read the original research

A robust brain network for sustained attention from adolescence to adulthood that predicts later substance use.

eLife, 13

View on PubMed ↗Publisher’s paper ↗

Citation

Weng, Yihe; Kruschwitz, Johann; Rueda-Delgado, Laura M; Ruddy, Kathy L; Boyle, Rory; Franzen, Luisa; Serin, Emin; Nweze, Tochukwu; Hanson, Jamie; Smyth, Alannah; Farnan, Tom; Banaschewski, Tobias; Bokde, Arun L W; Desrivières, Sylvane; Flor, Herta; Grigis, Antoine; Garavan, Hugh; Gowland, Penny A; Heinz, Andreas; Brühl, Rüdiger; Martinot, Jean-Luc; Martinot, Marie-Laure Paillère; Artiges, Eric; McGrath, Jane; Nees, Frauke; Papadopoulos Orfanos, Dimitri; Paus, Tomas; Poustka, Luise; Holz, Nathalie; Fröhner, Juliane; Smolka, Michael N; Vaidya, Nilakshi; Schumann, Gunter; Walter, Henrik; Whelan, Robert. (2024). A robust brain network for sustained attention from adolescence to adulthood that predicts later substance use.. eLife, 13. https://doi.org/10.7554/eLife.97150