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  • Title: Reversing the N400: event-related potentials of a negative semantic priming effect.
    Author: Bermeitinger C, Frings C, Wentura D.
    Journal: Neuroreport; 2008 Oct 08; 19(15):1479-82. PubMed ID: 18797301.
    Abstract:
    We investigated electrophysiological correlates of the access to semantic representations. Participants had to make word/nonword decisions to target words. A first word (i.e. the prime) preceded the target. The prime was either semantically related or unrelated to the target. Using a special masking technique we were able to present the prime rather long (approximately 140 ms) while preventing participants from consciously processing the prime. In line with former studies, participants showed a reversed priming effect: they reacted faster to unrelated compared with related targets. Interestingly, the N400 mimicked the behavioral effect: we observed more negative-going waveforms to related relative to unrelated targets. The result indicates that the N400 can reflect temporarily reduced access to semantic representations.
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