95 children pushed one of four buttons after which they received or lost toys on the basis of various reinforcement schedules. One group (25 S's) was given continuous reinforcement, the second group (25 S's) 50% reinforcement, the third group (25 S's) 60% reinforcement, and the fourth group (20 S's) no reinforcement. The 2 partially reinforced groups were significantly more resistant to extinction than the continuously reinforced group. There was no difference in resistance to extinction between the continuously reinforced group and the non-reinforced group. (PsycINFO Database Record (c) 2006 APA, all rights reserved)