Semantic Memory S08 p - EXP 3604 Semantic Memory Semantic...

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Unformatted text preview: EXP 3604 Semantic Memory Semantic Memory The database of general knowledge that enables our successful interaction with the world around us How is knowledge organized? How is knowledge represented? How is knowledge retrieved? Concepts and Categories Used to organize semantic memory Categories Class of objects that belong together Concepts Our mental representation of a category Sentence Verification Basic premise: Time required to retrieve one piece of information relative to another suggests how information is organized Procedure: Shown sentences involving concepts and categories "An apple is a fruit" "A television is a mammal" Answer TRUE or FALSE Record response time (latency) Four general effects with sentence verifications Typicality effect Decisions about typical members are faster than atypical members. Category-Size effect Decisions are faster when the concept is a member of small category compared to a large category. Four general effects with sentence verifications Semantic Priming effect Decisions are faster when preceded by a semantically-related concept. True-False effect True decisions are faster than false ones. Explanations for these effects HOW do we decide which concepts are similar or different? Feature Comparison Model (Hierarchical) Network Models Spreading Activation Models Model/PDP Models ACT Model Feature Comparison Model (Smith, Shoben, & Rips, 1974) Concepts are stored as a set of attributes or features: Two kinds of features: Defining features = necessary Feature Comparison Model To verify sentences, there are two stages: (1) First comparison : Compare all features If high overlap, quickly answer TRUE If low overlap, quickly answer FALSE If intermediate overlap, go to stage 2 = faster RT Feature Comparison Model To verify sentences, there are two stages: (2) Second comparison : Compare defining features If they match, answer TRUE; else answer FALSE Takes longer = slower RT FC Model - Problems What distinguishes defining & characteristic features?...
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This note was uploaded on 01/24/2010 for the course PSYCHOLOGY PCO 4930 taught by Professor Perrin during the Fall '09 term at Florida State College.

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Semantic Memory S08 p - EXP 3604 Semantic Memory Semantic...

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