Habits Switch on Quickly, Brain Study Reveals

Researchers at Johns Hopkins University discovered habits form much faster than previously believed, challenging the century-old theory of gradual strengthening through repetition. The team developed a new testing method using mice motivated by taste preference rather than thirst, revealing a sudden shift in behavior from goal-directed action to automatic habit.

Mice unexpectedly transitioned from responding to a cue only when wanting a reward to responding consistently, regardless of need, a change occurring between trials. The study also pinpointed a specific brain region potentially responsible for controlling this switch.

Some mice even reverted to goal-directed behavior after periods of habitual action, suggesting habits aren’t necessarily permanent. This finding prompted the National Institutes of Health to award the team a grant to further investigate the brain’s “controller” of habit formation. Understanding this mechanism could lead to methods for reversing negative habits and restoring goal-directed behavior.