Concurrent choice: effects of overall reinforcer rate and the temporal distribution of reinforcers

The responses of pigeons show an increase in time allocation over response-allocation sensitivity in concurrent exponential and arithmetic variable-interval schedules. The exponential-schedule sensitivity is also greater than arithmetic-schedule sensitivity for both measures of choice. The correlation of the shortest interval of the Hybrid 6 schedule with the mean interval, produce response and time sensitivities is lower than the changes variedly with overall reinforcer rates.