INDEPENDENCE OF REINFORCER AMOUNT AND DELAY - THE GENERALIZED MATCHING LAW AND SELF-CONTROL IN HUMANS

Six adult human females chose between pairs of different amounts and delays of reinforcement scheduled according to concurrent variable-interval schedules. Consistent with previous results obtained using pigeons, the present findings were described by a version of the generalized matching law in which the relative effects of amount and delay on preference are independent and multiplicative. Therefore adult humans' greater tendency than pigeons to show self-control (i.e., adult humans' greater tendency to choose larger, more delayed over smaller, less delayed reinforcers) cannot be explained by an interaction between the effects of reinforcer amount and delay. Further, the generalized matching law can be a useful tool in scaling adult humans' sensitivity to variation in relative reinforcer amount and variation in relative reinforcer delay. © 1992.