In one of KohnÂ’s examples, children in a small town were given points for every books they checked out of the local library during the summer vacation. The points could be redeemed for a free pizza, in an attempt to encourage reading.
The children in the program did indeed read more books than other children. But after the program ended, when reading no longer paid off in pizza, those children read far fewer books than others. Their own intrinsic desire to read books had been subsumed by the extrinsic reward, and when the pizza went away, so did the motivation.
I am so totally persuaded by this method that I asked my wife to take down the treasure box charts we keep for our kids at home. According to the treasure chest method, if Avery is good by doing her chores and reading books, she gets to advance a square until she eventually reaches a treasure chest square and gets a prize from the dollar store. Seems to work well, but not really. She despises cleaning and itÂ’s always a big struggle.
Today we were doing some cleaning and I made no mention of a reward. The only reward was that I tried to make cleaning fun by cleaning beside her and talking with her. She was Cinderella mopping the floor and loved it. After we finished cleaning one bathroom, she asked if we could clean the other.
Punishing by Rewards — Motivational Techniques That Don’t Work | I'd Rather Be Writing