DLPFC role in statistical learning

Background: Statistical learning allows for the extraction of regularities from the environment, but the causal role of the prefrontal cortex in modulating this process is not fully understood. While evidence suggests that the right dorsolateral prefrontal cortex (DLPFC) exerts a suppressive influence on such learning, the precise cognitive mechanisms underlying this regulation remain speculative.

Question / Future Work: It remains unclear whether the right DLPFC functions as a domain-general controller of information sampling strategies or whether its inhibitory role is specific to certain types of statistical regularities. Further research is required to determine if the observed increase in reaction time variability following right DLPFC inhibition reflects a shift in exploration-exploitation trade-offs or a broader modulation of attentional allocation during unsupervised learning.

Why It Matters: Understanding this mechanism is essential for clarifying how prefrontal circuits orchestrate the balance between automatic learning and flexible cognitive control, and whether this influence is mediated by attentional or exploration-specific neural circuits.

Evidence: As an alternative, we propose that right DLPFC inhibition shifts cognitive processing toward a more exploratory information-sampling strategy, a view supported by our finding of significantly greater reaction time variability in the right and bilateral stimulation groups.