Modeling individual differences query

[Marsha Lovett]

data from all you ACT-R modelers regarding the inclusion of individual
difference issues in your modeling work.

Please respond if you have done computational modeling of cognition in a
way that made explicit analysis of/reference to individual differences
among participants. Here are a few more specific questions, too:

#1 Was your modeling in ACT-R? Which version? (and of course, please point
me to a citation if the work was published)

#2 What kind of individual difference factor did you model? What task(s)
did you model? At what level of aggregation did you fit the data (e.g.,
subgroups of participants, extremes, individuals)?

#3 Did you model this individual difference factor by using different
knowledge sets (procedural or declarative)? Or did you model this by using
different parameter values (which paramater?)

#4 Did you use other empirical measures to triangulate this individual
difference?

Thanks! -Marsha