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This book achieves a goal that was set 25 years ago when the HAM
theory of human memory was published. This theory reflected one of
a number of then-current efforts to create a theory of human
cognition that met the twin goals of precision and complexity. Up
until then the standard for precision had been the mathematical
theories of the 1950s and 1960s. These theories took the form of
precise models of specific experiments along with some informal,
verbally-stated understanding of how they could be extended to new
experiments. They seemed to fall far short of capturing the breadth
and power of human cognition that was being demonstrated by the new
experimental work in human cognition. The next 10 years saw two
major efforts to address the problems of scope. In 1976, the ACT
theory was first described and included a production rule system of
procedural memory to complement HAM's declarative memory. This
provided a computationally adequate system which was indeed capable
of accounting for all sorts of cognition. In 1993, a new version of
ACT--ACT-R--was published. This was an effort to summarize the
theoretical progress made on skill acquisition in the intervening
10 years and to tune the subsymbolic level of ACT-R with the
insights of the rational analysis of cognition.
This book achieves a goal that was set 25 years ago when the HAM
theory of human memory was published. This theory reflected one of
a number of then-current efforts to create a theory of human
cognition that met the twin goals of precision and complexity. Up
until then the standard for precision had been the mathematical
theories of the 1950s and 1960s. These theories took the form of
precise models of specific experiments along with some informal,
verbally-stated understanding of how they could be extended to new
experiments. They seemed to fall far short of capturing the breadth
and power of human cognition that was being demonstrated by the new
experimental work in human cognition. The next 10 years saw two
major efforts to address the problems of scope. In 1976, the ACT
theory was first described and included a production rule system of
procedural memory to complement HAM's declarative memory. This
provided a computationally adequate system which was indeed capable
of accounting for all sorts of cognition. In 1993, a new version of
ACT--ACT-R--was published. This was an effort to summarize the
theoretical progress made on skill acquisition in the intervening
10 years and to tune the subsymbolic level of ACT-R with the
insights of the rational analysis of cognition.
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