Semantic priming in the lexical decision task: Roles of prospec-tive prime-generated expectancies an (original) (raw)

In semantic priming paradigms for lexical decisions, the probability that a word target is semantically related to its prime (the relatedness proportion) has been confounded with the probability that a target is a nonword, given that it is unrelated to its prime (the nonword ratio). This study unconfounded these two probabilities in a lexical decision task with category names as primes and with high-and low-dominance exemplars as targets. Semantic priming for highdominance exemplars was modulated by the relatedness proportion and, to a lesser degree, by the nonword ratio. However, the nonword ratio exerted a stronger influence than did the relatedness proportion on semantic priming for low-dominance exemplars and on the nonword facilitation effect (i.e., the superiority in performance for nonword targets that follow a category name rather than a neutral XXX prime). These results suggest that semantic priming for lexical decisions is affected by both a prospective prime-generated expectancy, modulated by the relatedness proportion, and a retrospective target/prime semantic matching process, modulated by the nonword ratio. People are typically faster and more accurate in responding to a target word when it is accompanied by or immediately preceded by a semantically related priming word, relative to an unrelated priming word (e.g,, Meyer & Schvaneveldt, 1971; Neely, 1976). This semantic priming effect has most often been studied in the lexical decision task, in which subjects indicate whether a target letter string (e.g., robin or tark) is a word or a nonword. The relatedness proportion effect is the finding that semantic priming increases in magnitude with increases in the proportion of related word-prime/word-target trials-a proportion hereafter referred to as the relatedness proportion. The relatedness proportion effect is very robust and has been obtained across a wide range of procedural variations in the lexical decision task (de Groot,

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