ACT-R_Nina Wei
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Content from CMU ACT-R Research Group: http://act-r.psy.cmu.edu/, and wikipedia, and other research articles.
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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.
- 7. What ? History Inspiration 1973-1990 1990-1998 1998-present Allen Newell The idea of unified theories
- 8. An ultimate scientific questions: How can the human mind occur in the physical universe ? A presentation on 4 December 1991.
- 9. What ? History Inspiration 1973-1990 1990-1998 1998-present Allen Newell John R. Anderson Gordon Bower Early years: HAM and ACT theory 1 The idea of unified theories
- 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
- 11. What ? History Inspiration 1973-1990 1990-1998 1998-present Allen Newell John R. Anderson Gordon Bower Early years: HAM and ACT theory 1 The idea of unified theories Integration with rational analysis John R. Anderson
- 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
- 14. What ? History Inspiration 1973-1990 1990-1998 1998-present Allen Newell John R. Anderson Gordon Bower Early years: HAM and ACT theory 1 The idea of unified theories Integration with rational analysis John R. Anderson CMU Groups Current developments
- 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.
- 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.
- 25. How ? Mechanism Modules Buffers Pattern matcher Main components
- 26. How ? Modules Take care of with the real word The visual and the manual models Two kinds of memory modules Perceptual-motor modules Memory modules
- 27. How ? Memory Modules Declarative memory Procedural memory
- 28. How ? Memory Modules Declarative memory: facts Procedural memory
- 29. Eg. Washington D.C. is the capital of United States.
- 30. How ? Memory Modules Declarative memory: facts Procedural memory: productions
- 31. Eg. How to type the word “COPSY”.
- 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.
- 34. How ? Pattern matcher ACT-R is a hybrid cognitive architecture.
- 35. Its symbolic structure is a production system.
- 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.
- 39. How ? Detailed Information "How Can the Human Mind Occur in the Physical Universe" (2007)