Abstract
Semantic context effects have variously been attributed to prospective processing – predictions about upcoming words – or to retrospective appreciation of relationships after reading both context and target. In two experiments, we altered the core variable distinguishing prospective from retrospective processing, namely time. Word pairs varying in strength of relationship were presented sequentially, to allow time for anticipation of the second word, or simultaneously. For both sorts of presentation, the amplitude of the N400 component of the event-related potential was graded from Unrelated to Moderate/Weak to Strong associates. Strong associates showed a temporal advantage over weaker associates – an earlier context effect – only during sequential presentation. Spatial distributions of the N400 context effects also differed for simultaneous versus sequential presentation.
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