Pooled LHT performance in a selection of three target times. Cumulative probability distributions of response durations [p(duration <x)] for 3 target times (T). Distributions were constructed by pooling data across rats of each strain. Insets are corresponding probability densities; strains are identified by corresponding symbols. Curves in the cumulative distributions are fits of the Temporal Regulation (TR) model (Equation 1) to the performance of each strain. The distribution of response duration tracked the target time (vertical dotted lines). At T = 5 s, an extra inflexion is visible on the left side of all distributions.