This paper reviews the ability of Morton's Logogen model and Becker's Verification model to accommodate RT data from the lexical decision literature. While both of the models can account for the simple effects of word frequency, word context and word repetition, Morton's Logogen model can not account for some of the patterns of additivity and interaction when the effects of stimulus degradation are considered.
An experiment on lexical decision is then reported in which stimulus degradation and repetition are factorially varied; degradation and repetition are shown to be interacting factors. These results are inconsistent with the Verification model but consistent with the Logogen model.
Finally, further versions of both the Logogen and Verification models are considered and possible multiple sources are proposed to account for the effects of degradation, repetition and word frequency.
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