RESUMOO estudo investigou (1) se a mudança de um múltiplo FR FR para um FI-custo FI-custo produziria diminuição na taxa de respostas e (2) o papel da magnitude do custo e sua ordem de apresentação. Participaram nove universitários expostos a um múltiplo FR60 FR60 até que o responder estabilizasse. Na Fase 2 distribuíram-se em dois grupos que variavam em relação a ordem de apresentação dos componentes: G1 múltiplo FI custo 1 FI custo 10 e G2 múltiplo FI custo 10 FI custo 1. Todos os participantes emitiram altas taxas de respostas na Fase 1 e diminuíram as taxas na Fase 2. Palavras-chave: custo da resposta; história comportamental; magnitude do custo; esquema de reforço; humanos. ABSTRACT Different Response-cost Magnitudes on a Multiple FI FI After a Multiple FR FR HistoryThis study investigated (1) if the transition from a multiple FR FR to a multiple FI-cost FI-cost would lower response rates and (2) the effects of different cost magnitudes and their order of presentation. Nine undergraduates were exposed to a multiple FR 60 FR 60 in Phase 1 until responding was stable. In Phase 2 they were distributed into two groups: G1 multiple FI-cost 1 FI-cost 10 and G2 multiple FI-cost 10 FI-cost 1. For all participants, response rates decrease from Phase 1 to Phase 2 were high and low, respectively, in Phases 1 and 2.
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