Korean researchers used MRI scans to examine the brains of healthcare workers who consistently work long hours. They compared two groups: those with a normal workweek and those working 52 hours or more. The overworkers showed clear differences in brain regions related to emotional processing and cognitive functions like planning, memory, and decision-making.
One striking discovery was a 19% increase in the volume of the middle frontal gyrus, a region linked to attention, working memory, and language. The insula, which regulates emotions and self-awareness, also showed changes. These findings suggest that chronic overwork may lead to structural brain adaptations, potentially affecting focus, emotional stability, and productivity.