Strategic control of sentence context effects in a naming task

This paper reports an experiment that demonstrates strategic influences on sentence context effects in a naming task. The size of the sentence context effect is shown to be influenced by the validity of the contextual information. A similar result is obtained simply by changing the proportion of validly completed sentences in the practice session without altering the composition of the experimental trials themselves. The manipulation of context validity was found to have its effect largely on the facilitatory component of the context effect. This dissociation of facilitation and inhibition is shown to be contrary to the predictions of attentional accounts of priming but in line with an explanation of contexts effects based on a mechanism that has evolved primarily to resolve lexical and perceptual ambiguity (Norris, 1986). In a further experiment it is shown that the facilitatory effects of sentence context observed in Experiment 1 are not dependent on the particular baseline condition employed.