Using a between-subjects design, we evaluated the effect of structural features of slot machines in the form of stopping buttons and win rate on response allocation to two concurrently available simulated slot machines. Participants were randomly assigned to conditions that consisted of the slot machine with stopping buttons paying out substantially more, less, or equally to a slot machine that did not feature any stopping devices. Results indicated that win rate, rather than presence of stopping devices, played a primary role in determining to which slot machine participants allocated responses.



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