How do rewards affect intrinsic motivation?

What will be an ideal response?

People are intrinsically motivated to pursue a particular activity when they do so purely
out of interest, challenge, or sheer enjoyment. The receipt of rewards for engaging in
that activity can thus undermine their intrinsic motivation. Indeed, people who start
getting paid for a task that they already enjoy and used to do for free sometimes lose
interest in the task and continue it only because of the money they are earning.
Rewards are particularly likely to undermine intrinsic motivation when they are
perceived as controlling such behavior. For example, if people who enjoy sculpting
begin to get paid for this activity, they will likely lose intrinsic motivation to the extent
that they perceive the money to be the primary reason for continuing to sculpt. If,
instead, the money is perceived as having informational value in that it offers positive
feedback about the quality of the art, and the artists believe that the money is not an
important reason for sculpting, then their intrinsic motivation should not be undermined
and may even be increased.