Scientists have known since Michael Zeiler’s famous pecking pigeon experiments from the 1970s that rewards delivered unpredictably are far more enticing than those delivered with a known pattern. Something about unpredictability releases more dopamine—a key neurotransmitter for regulating our sense of craving. The original Zeiler experiment had pigeons pecking a button that unpredictably released a food pellet. As Adam Alter points out, this same basic behavior is replicated in the feedback buttons that have accompanied most social media posts since Facebook introduced the “Like” icon in 2009.
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