Abstract: Using the reaction time (RT) determined by Fox (1984) as a paradigm,this experiment investigated the nature of lexical effects on phoneme per-ception, and examined two models suggested by Ganong (1980) for explai-ning lexical effects. The results showed that lexical effects did notchange across the two RT ranges after the lexical access, and that the resp-onse distribution across RT ranges and stimuli predicted an increase oflexical effects in the larger RT ranges. Thus lexical effects were reducedas the reaction time was increased. The paper discussed the implicationsof this conclusion on the two models suggested by Ganong and on thetheories of speech perception.

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