The Discipline Matures Lecture.docx

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Department
Cognitive Science
Course
COG SCI 190
Professor
Terry Regier
Semester
Fall

Description
The Discipline Matures Lecture • Behaviorism o Environment  ▯Behavior • Cognitive science o Environment  ▯Representation (and processing)  ▯Behavior • Language is special o Uniquely human o Classic challenge to behaviorism (whitehead) o Symbolic system par excellence • Language o Defining feature of human cognition o We have seen proposals about how linguistic knowledge is represented but not  how it is processed o Language is understanding – necessarily at least partly symbolic • Eliza (mimicking understanding) o  Joseph Weizenbaum  o Original chatterbot: applied pattern matching rules to human’s statements, and  replied accordingly o No representation of meaning of the statements o Remarkably easy to talk to o Input is examined, keywords are matched and an appropriate response is output o Nothing near “understanding” o Symbolic but shallow • SHRDLU o Terry Winograd “All language use can be thought of as a way of activating  procedures within the hearer” o Natural language understanding in a micro­world o Language linked to action o This is the one with the blocks and pyramids and such o 3 interacting components  Syntactic analysis: Grammatical analysis of input sentences  Semantic analysis: Determine what the sentence means  Perception and inference: consult the “world” for answers to questions  posed  All implemented as procedures o Example for syntactic analysis: Sentence  ▯noun phrase + verb phrase • SHRDLU recap o Narrow, limited domain  In that domain it do
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