Derailed train of thought? Brain's stopping system may be at fault

Study suggests that the same neural mechanism that interrupts body movement also interrupts cognition. The findings may give insights into Parkinson's disease. The brain circuitry implicated in 'over-stopping' motor activity in these patients might also be keeping them over-focused. More speculatively, it may be worth investigating if this circuitry plays a role in conditions characterized by distractibility, such as ADHD.