Neuroscientists put 56 people in an fMRI scanner and let them scroll short videos. When a video hit, the two brain regions responsible for ending the session went dark. The videos people swiped away early left those same regions untouched. The dACC is your brain's conflict monitor. It fires when what you're doing clashes with what you planned, like watching a 14th video at 1am when you meant to sleep 40 minutes ago. The dlPFC takes that signal and executes, moving your thumb to close the…