Abstract
A model of the dynamics of output under fixed-interval schedules of reinforcement is presented. This model primarily involves two processes: a reflex reserve-type mechanism (leading to output in successive intervals being inversely related), and a repeat output mechanism (in which the output level of the previous interval is simply repeated). On a particular interval, one or other process is followed; thus, the model has one parameter, the probability of a repeat ouput. In addition, a random factor (a value selected from a uniform distribution about zero output) is added to the output to simulate real data. Within the model, previously discrepant results from studies employing autocorrelation analyses of behaviour dynamics are seen to require small variations in the repeat output parameter. Output of the model also exhibits the more complex directional and clustering dynamics recently discovered. In general, the model is able accurately to simulate all the known characteristics of dynamic output under fixed-interval schedules.