Before revision: In 1974, the modern expression "[don't] think of a pink elephant" appeared in Curt Siodmak's City In the Sky: Alternative Psychological reactance theory is a more ultimate explanation for the rebound effect than the ironic process theory .
After revision: In 1974, the modern expression "[don't] think of a pink elephant" appeared in Curt Siodmak's City In the Sky: Alternative Psychological reactance theory is an alternative explanation for ironic process phenomena .