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

(University of California - San Diego) 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.