Lecture 11 - Computer Science - Part 1

Lecture 11 - Computer Science - Part 1 - Introduction to...

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Introduction to Cognitive Science PSYCH 1102/COGST 1101/LING 1170/ PHIL 1910/CS 1710
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Computer Science Symbol Systems Philosophy                               Psychology                Neuroscience Linguistics Science Mind?
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Outline What is computer science? And what does it have to do with “cognition”  anyways? Physical Symbol Systems Good Old Fashioned AI More philosophy of mind The Chinese room argument Representing Semantics 1 Semantics as relational properties Representing Semantics 2 Via reference to real world objects
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What is computer science? And what does it have to do with  “cognition” anyways?
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Why should we assume computer can  tell us anything about brains and/or the  mind? Computer models of cognition are explicit,  testable & falsifiable Unlike some philosophical theories of mind If we believe in the computational approach to  cognition, then artificial intelligence is at least  possible Might let us in on how the brain solves similar  cognitive problems by comparing the solutions  of the program and the human What is computer science?
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Recall Alan Turing Any problem that can be solved  computationally can be solved  with a Universal Turing Machine All machines are in a sense  equivalent Can we compute  cognition? If so, AI is possible What is computer science?
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Physical Symbol Systems Good Old Fashioned AI
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Newel & Simon (1976) The Physical Symbol Systems (PSS)  Hypothesis Physical Symbol Systems
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3 parts to a PSS a set of symbols elements which can be manipulated via rules Physical Symbol Systems
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A set of operations, rules to allow one to  manipulate the symbols syntactically Create Destroy Combine Separate Copy Physical Symbol Systems
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A body of real world knowledge to supply  meaning to the symbols Physical Symbol Systems
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“A physical symbol system [of sufficient  size] has the necessary and sufficient  means for general intelligent action” Intelligence is computable Sufficient: All it takes is symbols, syntax & a link  to a knowledge base Necessary: This is the only set of items able to  create intelligence This is the guiding principle of GOFAI (Good Old  Fashioned AI) Physical Symbol Systems
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Much artificial intelligence research  worked in the PSS framework The really interesting parts of cognition were  the complex cognition problems But these would be solved with an appropriately 
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This note was uploaded on 11/30/2009 for the course PHIL 1910 at Cornell University (Engineering School).

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Lecture 11 - Computer Science - Part 1 - Introduction to...

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