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psyc 325 - ch 5 definition -semantic and lexical memory

8 Pages

Course Code
PSYC 325
Mario Liotti

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Semantic and Lexical MemoryLexical memoryLanguage need large representational system and extremely efficient retrieval system Retrieve particular words from huge supply from moments notice each time speak and writeSeparate neurocognitive system from semantic memory Psycholinguistsinterested in structure of the representational system involved in lexical memory because1Must maintain huge number of times words and rules of grammar stored in memory2Access to items must be extremely fast in order to support normal speech and comprehensionChildren start life knowing no wordsencoding of words to lexical memorygreat interest since children acquire vocabulary at astonishing rates Association model As activation spreads to multiple nodes it fades and can no longer see of semantic trail of activationmemoryOur memory is a web of interconnected ides and factsSemantic network Posit retrieval takes place when one node is activated based on input modelsfrom a cueonce node activatedactivation will spread to existing associated nodes spreading activationActivation weakens as it spreads from node to node thus it can stop when too weakTheoretical architecturetested by 1 Semantic priming 2 Sentence verification task manner which spreading activation of association networks experimented Lexical decision cognitive task in which subjects judge if string of letters is a word as quickly as they cantaskex Not wordsscrawpspluckbanresponse of no doctorresponse of yesjudge quickly to measure reaction timeyoung adult in collegedecisions under half secondwhere semantic priming can then be added onwhere still judge string of letters but now string is preceded by a primeusually a word but may be picture primesmay be relatedunrelated to tobejudged words ex Target word doctor related primenurse unrelated primegum research consistently show related primes produce faster and easier processing of target wordfaster reaction times in lexical decision for words preceded by related primes than those preceded by unrelated primesSubliminal subject not consciously aware of stimuli that are affecting their behaviour primingSemantic primingoccurs because participant processes the primeMediated primingoccurs when prime word is related to a word which is also related to the target wordquantitative mathematical models of how priming occursex nurse prime doctor and small priming of lawyerDunabeitia studymediated priming could also cross over from semantic characteristics to phonological characteristics ex First link in primingsemantic but second link is phonological sound related Levels ofmost common level of categories and one we are most Basic level categorizationlikely to invoke ex Toobasiclevel category power toolsSubordinate levelallows for more specific or specialized categories to be formed ex Power tools and first generation Mexican Americans
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