05.24_Knowledge1

05.24_Knowledge1 - © S. J. Luck All rights reserved 1 ©...

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Unformatted text preview: © S. J. Luck All rights reserved 1 © S. J. Luck All Rights Reserved Knowledge Representation I • The human mind contains representations of the world • Representations can be analog or propositional • In analog representations, quantitative physical variations in the representation map onto quantitative physical variations in the thing being represented – Example: Representing the quantity 18 as: – Example: Representing the person Ricky Martin as: • Propositional representations bear an arbitrary relationship to the thing being represented – Example: Representing the quantity eighteen as “ 18 ” or “ XVIII ” – Example: Representing the person Ricky Martin as the phrase “A latin-pop music star with heavily moussed hair and teeth so white that they must have been capped” • A propositional representation consists of a set of symbols and relations among the symbols • Information can be stored equally accurately in analog and propositional representations – In theory, it is always possible to translate one type of representation into the other with perfect Fdelity-1879 +3766 +3987-1767-4878-2654 … Air pressure converted into voltage by microphone (analog representation) Voltages converted into numbers at discrete time points and stored on computer (propositional representation) Recording Studio ¡ilter AmpliFer Numbers converted back into voltages (analog representation) Voltage converted back into air pressure Voltages smoothed by Flter • Information can be stored equally accurately in analog and propositional representations – In theory, it is always possible to translate one type of representation into the other with perfect Fdelity-1879 +3766 +3987-1767-4878-2654 … Air pressure converted into voltage by microphone...
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This note was uploaded on 11/08/2010 for the course PSC PSC100 taught by Professor Luck during the Spring '10 term at UC Davis.

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05.24_Knowledge1 - © S. J. Luck All rights reserved 1 ©...

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