CGSC 2001 Lecture Notes - Lecture 7: Physical Symbol System, Allen Newell, Neural Substrate

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COGSCI
February 5th
What basic laws govern COGSCI?
Addressed by Herb Simon and Allen Newell
Influential AI researchers
Physical Symbol System Hypothesis
A physical symbol system has the necessary and sufficient means for general intelligent actions
(Newell and Simon)
oTwo key implications
About how the cognitive system works
oCognition = representation + operations on the representation
Four Basic Ideas from the PSSH (Bermudez)
1. Symbols are physical patterns
2. Symbols can be combined with one another
3. Physical symbol systems contain processes for manipulating complex symbol structures
4. These processes can themselves be represented by symbols and symbol structures within the
system
What is a symbol?
A physical symbol system has the necessary and sufficient means for general intelligent actions
A symbol is a patter that denotes something
oExample: words, sentences, gestures, marks on paper, sequences, etc.
A symbol system is a set of symbols that can be composed into more complex structures by a set
of rules
oEx. “put the block on the blue block”
What is a physical system?
A physical symbol system has the necessary and sufficient means for general intelligent actions
Conveys that a symbol system must be realized in some physical way in order to create
intelligence
Physical basis may be:
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