Abstract
In this paper, we review the studies which aim to understand the effects of the central cholinergic manipulation on the temporal discrimination behavior. We start with a brief introduction of the tasks and their properties used in the studies of temporal discrimination. After that, we summarize the features of the studies in which the cognitive process theories are not considered. Then we sketch a representative cognitive model, “the information processing model, ” and summarize the features of the studies which were executed on the basis of this model. We clarify some distinctions between these two types of studies and point out the two variables which may cause those distinctions : the number of trainings under drug treatment and the potency of the drug. Next, we present our experiment in which the effects of these two variables on temporal discrimination were examined, and suggest some questions about the information processing model and the hypothesis of correspondence between the model and the cholinergic systems.
