A common assumption about breaking a bad habit is that sufficient effort or time eventually erases it — but neuroscience research suggests habits aren't actually deleted once formed, they go dormant, remaining fully intact and ready to reactivate the moment their original cue and reward conditions reappear. This has a direct, sobering implication for anyone who has successfully stopped an old habit only to have it resurface abruptly after a period of dormancy: the relapse isn't a sign that the earlier progress was fake, it's a demonstration of how the underlying neural pattern actually works.
The practical implication is that lasting behavior change usually requires more than temporarily suppressing an old routine — since the old loop remains dormant rather than erased, a genuinely new competing habit generally needs to be actively built and reinforced, rather than simply waiting for enough time to pass for the old one to disappear on its own.
Ann Graybiel's lab trained rats to run a maze until the behavior became a fully automatic habit, then "extinguished" it by moving the reward to a different location, causing the old maze-running pattern to stop. When researchers later moved the reward back to its original spot, the old habit snapped back into place almost instantly — far faster than the original learning process had taken — showing the behavior hadn't actually been forgotten, just deactivated while its specific cue and reward conditions were absent.