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Effects of task demand and contextual expectancy on sentence comprehension:Evidence from P600 in brain potentials

【摘要】:正Three ERP(event - related potential) experiments were conducted to examine the effects of task demand and contextual expectancy on sentence comprehension.Sentences with the structure"subject noun + verb + adjective + object noun"were used.The contextual expectancy towards the object noun was either high or low and the semantic relationship between the object noun and the preceding adjective was either maintained or mismatched. In Experiment 1,participants were asked to read sentences and make semantic plausibility judgment to each of them.In addition to a N400 effect,the mismatching object noun elicited a P600 effect as compared with the matching noun,but this effect appeared in sentences with high expectancy,not in sentences with low expectancy.In Experiment 2,participants were asked to read sentences for comprehension and to complete an

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