Elevate Developer Efficiency & build GenAI Application with Amazon Q
ACT-R_Nina Wei
1. ACT-R
Adaptive Control of Thought – Rational
An Integrated Theory of the Mind
By Nina
Department of Psychology, Zhejiang Sci-Tech University
Contact me : weizhuxiaona@gmail.com
4. Cognitive Psychology
Brain Imaging
What ?
Cognitive Computing
fMRI
Lisp
John Anderson
Models
Declarative
Procedural
Symbolic
Java Python
Memory
Attention
Complex Tasks
Executive Control
Education
Neuroscience
Language
Decision
HCI
5. ACT-R is a cognitive architecture: a theory for simulating and understanding
human cognition. Researchers working on ACT-R strive to understand how people
organize knowledge and produce intelligent behavior.
As the research continues, ACT-R evolves ever closer into a system which can
perform the full range of human cognitive tasks: capturing in great detail the way we
perceive, think about, and act on the world.
10. Human Associative Memory
--the original declarative memory system
--described by Anderson & Bower in 1973
The 1st version of the ACT theory
--introducing a computational dichotomy
+ the procedural memory
The ACT* model of human cognition
12. Rational Analysis, a mathematical approach to cognition, whose basic assumption of Rational
Analysis is that cognition is optimally adaptive, and precise estimates of cognitive functions
mirror statistical properties of the environment.
13. Rational Analysis
(as a unifying framework)
the ACT theory
ACT-R
+
The importance of the new approach
in the shaping of the architecture
ACT-R 4.0
--optional perceptual and motor capabilities
--mostly inspired from the EPIC
15. ACT-R 4.0
--optional perceptual and motor capabilities
--mostly inspired from the EPIC
ACT-R 5.0
--introducing the concept of modules
--specialized sets of procedural and declarative representations that
could be mapped to known brain systems
--Specialized structures for holding temporarily active information
ACT-R 6.0
--a new version of the code, presented in 2005
--including significant improvements in the ACT-R coding language
19. What ?
Basic Theory
• time to perform the task,
• accuracy in the task, and,
• (more recently) neurological data such as those
obtained from FMRI.
• collect quantitative measures that can be directly
compared with the quantitative measures obtained
from human participants.
20.
21. Where ?
Models
learning and memory
problem solving &
decision making
language & communication
cognitive development individual differences
perception & attention
23. Some of the most successful applications, the Cognitive Tutors for Mathematics, are used in
thousands of schools across the country.
Such "Cognitive Tutors" are being used as a platform for research on learning and cognitive
modeling as part of the Pittsburgh Science of Learning Center.
32. How ?
Buffers
• ACT-R accesses its modules (except for the
procedural-memory module) through buffers.
• For each module, a dedicated buffer serves as
the interface with that module.
• The contents of the buffers at a given moment
in time represents the state of ACT-R at that
moment.
33. How ?
Pattern matcher
• The pattern matcher searches for a production
that matches the current state of the buffers.
• Only one such production can be executed at a
given moment.
• That production, when executed, can modify the
buffers and thus change the state of the system.
• Thus, in ACT-R cognition unfolds as a succession
of production firings.
36. The subsymbolic structure is represented by a set of massively parallel
processes that can be summarized by a number of mathematical equations.
37. The subsymbolic equations control many of the symbolic processes,whether
(or how fast) a fact can be retrieved from declarative memory depends on
subsymbolic retrieval equations, which take into account the context and the
history of usage of that fact.
38. They are also responsible for most learning processes in ACT-R.