| Sumario: | Effort discounting is the decrease in the subjective value of a reward as the effort required to obtain it increases. In the present study, we assessed the effects of two procedures (fixed sequence and titrating sequence procedures) and two effort types (climbing floors and pedaling) on data-systematicity and the rate of effort discounting with human participants. There were no differences in the rate of discounting or in the production of systematic data between procedures. However, discounting was steeper when the required effort was climbing floors compared to pedaling, and there were more nonsystematic data production due to the use of pedaling as the required effort. Both the hyperbolic and parabolic models were fitted to the indifference points and there was a better fit of the hyperbolic model compared with the parabolic model. The effort type, but not procedure, affected the level of data systematicity and influences the degree of effort discounting, suggesting these two factors influence behavior by different mechanisms.
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