Multiple parallel streams compete to interpret each sentence

Correct: B — Multiple, simultaneously active streams (semantic-thematic, morphosyntactic, plausibility-based) cooperate or compete to determine the final interpretation, indexed by characteristic ERP signatures

Kuperberg (2007) drew on ERP evidence to argue against strict serial syntax-first models of sentence comprehension. She proposed that comprehenders run multiple analyses in parallel: a semantic-thematic stream that maps event roles directly from word meanings, a morphosyntactic stream for grammatical structure, and a plausibility/world-knowledge stream. The N400 indexes lexical-semantic access difficulty; the P600 reflects revision or competition between streams when their outputs conflict. The framework explains 'semantic P600' findings — where unexpected but morphosyntactically licit sentences elicit P600 responses — that pure syntactic accounts struggle to handle.