Abstract
Adaptive control of thought-rational (ACT-R; J. R. Anderson & C. Lebiere,
1998) has evolved into a theory that consists of multiple modules
but also explains how these modules are integrated to produce coherent
cognition. The perceptual-motor modules, the goal module, and the
declarative memory module are presented as examples of specialized
systems in ACT-R. These modules are associated with distinct cortical
regions. These modules place chunks in buffers where they can be
detected by a production system that responds to patterns of information
in the buffers. At any point in time, a single production rule is
selected to respond to the current pattern. Subsymbolic processes
serve to guide the selection of rules to fire as well as the internal
operations of some modules. Much of learning involves tuning of these
subsymbolic processes. A number of simple and complex empirical examples
are described to illustrate how these modules function singly and
in concert.
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