A series of contingencies in which the CS is followed by the US 50% of the time and the US never occurs if the CS has not occurred. OP(USICS)=1.0; p(USIES) = 0.0 OP(USICS) = 1.0; p(US(ES) = 0.5 OP(USICS)=0.5; p(US(ES) = 0.0 OP(USICS)-0.5; p(US €5) -0.5 O None of the above

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