The White Matter of Aha! Moments

Abstract

Insights, or "Aha!" moments, are a crucial aspect of idea generation in creative cognition. While functional neuroimaging studies have identified brain regions involved in these insights, the white matter substrate of insights remains unexplored. This study employed Diffusion Tensor Imaging (DTI) to investigate how white matter microstructure-measured by Fractional Anisotropy (FA) and Mean Diffusivity (MD)-relates to individuals' tendency to solve Compound Remote Associates problems through insight versus step-by-step analytical reasoning. After controlling for age and gender, insightfulness was found to be associated with lower FA (and higher MD) in the left posterior Arcuate Fasciculus (AF) and bilateral Superior Longitudinal Fasciculi III. Conversely, step-by-step idea generation was linked to higher FA (and lower MD) in the left Vertical Occipital Fasciculus (VOF) and to higher FA in the anterior corpus callosum. These findings suggest that insight may benefit from more diffuse connectivity patterns, allowing for broader semantic activation and cognitive flexibility, while analytical idea generation relies on stronger structural connections supporting executive control. Our study provides novel evidence for distinct structural connectivity patterns associated with different idea-generation approaches, contributing to a more comprehensive understanding of the neural architecture supporting creative cognition.