Modulating task outcome value to mitigate real-world procrastination via noninvasive brain stimulation

Procrastination represents one of the most prevalent behavioral problems associated with individual health and societal productivity.

Despite its high prevalence and substantial impact on daily functioning, its underlying neurocognitive mechanisms remain poorly understood.

A leading model posits that procrastination arises from imbalanced competing motivations: the avoidance of negative task aversiveness and the pursuit of positive task outcomes, yet this framework has not been fully validated in real-world settings and not applied effectively to guide interventions.

Here, we addressed this gap with a double-blind, randomized controlled trial.

We applied seven sessions of high-definition transcranial direct current stimulation (HD-tDCS) to the left dorsolateral prefrontal cortex (DLPFC) in chronic procrastinators.

Using the intensive experience sampling method (iESM), we assessed the effect of anodal HD-tDCS on real-world procrastination at offline after-effect (2-day interval) and long-term after-effect (6-month follow-up).

We found that this neuromodulation produced a lasting reduction in real-world procrastination, with effects sustained at a 6-month follow-up.

While the intervention is significantly associated with both decreased task aversiveness and increased perceived task outcome value, a mediation analysis indicated a disassociable mechanism: the increase in task outcome value (but not task aversiveness) showed a statistical pattern consistent with accounting for the observed behavioral improvement.

In conclusion, the findings are consistent with the hypothesis that enhancing DLPFC function may reduce procrastination by selectively amplifying the valuation of future rewards, not by simply reducing negative feelings about the task.

These results align with established decision-theoretic frameworks and suggest a targeted, theory-informed avenue for future behavioral interventions.