Values of the free model parameters following optimisation.

represents the mean value of parameter across all thirty challenges. In all cases except , the value is divided by the default parameter value. Thus a value close to 1 implies that the model default is consistent with the data from the study. is the population standard deviation of values of across all thirty challenges. A low value of implies that parameter does not show great variation between subjects. represents the mean value of parameter across the three challenges for individual (normalised, except for ). represents the population standard deviation of values of across all three challenges for individual . Low values of suggest that a parameter can be reliably determined for an individual.