A late neurophysiological response, the N400, is well known to reflect word processing and semantic context integration. Nevertheless, behavioural and neurophysiological data have demonstrated that word features and semantic sentence context influence linguistic processes already within the first 200 ms following the onset of the critical word stimulus. The lack of early word-related ERP effects in some studies might be due to large stimulus variance on relevant linguistic parameters, for example the length of written words or their frequency of usage. Here we investigated the effect of the length of words, their standardized lexical frequency and probability to occur in a given semantic context, by orthogonally varying these factors in a sentence-reading task. We found word frequency and probability to be reflected neurophysiologically already at 120 and 180 ms after written word onset. However, at these early stages frequency and probability effects were modulated by word length, ...
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