A reinforcement schedule where only some instances of the desired behavior are rewarded, rather than every occurrence. This creates stronger resistance to extinction compared to continuous reinforcement.
Coined in the 1940s-1950s from Latin 'partialis' (relating to a part) and reinforcement studies. Researchers discovered the counterintuitive finding that inconsistent rewards actually create more persistent behavior than consistent ones, revolutionizing understanding of motivation.
Partial reinforcement explains why intermittent relationships are so hard to leave - the occasional positive interaction creates stronger attachment than consistently good treatment! It's also why children's tantrums can be so persistent if parents occasionally give in.
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