Rats that had done the task one hundred times did the smart thing—they no longer wanted to push the lever once the food was devalued.[27] But rats that had done the task five hundred times ran up to the lever and just started pushing it like crazy, even if the food was devalued. And in all these tests, the food pellets never were given; the group that had become insensitive to devaluation just kept pushing the lever without ever getting a reward.
Habits and muscle memory
