Transcript An Integrated Theory of the Mind

An Integrated Theory of the Mind
John Anderson et al.
Psychological Review, 111, 1036-1060 (2004)
ACT
• Computational cognitive model
• 20-30 years, army of researchers
• Model & modeling environment
– Applied to many cognitive tasks
– Constrained by common architecture &
parameters
• Initially focused on high-level cognition
• Elaborated with perceptual-motor modules
Architecture
Long-term
Memory
Goals
Productions
Working Memory
Perception
Action
Productions
• If-Then rules
• Triggered by contents of WM
• Depend on current goal, knowledge, and
perceptual input
• Outputs:
– Update goal
– Update declarative knowledge
– Perform action
• “Central decision makers”
Example
Goal Stack
Do Addition
Addition Fact
Add Units
Working Memory
Recall Sum
Summand 3
Summand 4
Summand
Sum 7 3
IF:
Goal = Recall Sum
IF:
Summand
X
Goal = Add
Summand
Y Units
Sum XFact: X + Y = Z
Addition
THEN:
THEN:
Write XSummand X
Remove
Pop Goal
Remove
Summand Y
Add Sum Z
Pop Goal
Declarative Knowledge
Sum 7
Summand 4
Goal: Add Units
Goal: Recall Sum
Motor
Perception
73
+44
“7”
Issues
•
•
•
•
•
Characterization of modules
Subsymbolic processing
Learning
Modeling complex tasks
Mapping to neuroanatomy