The interaction of top–down and bottom–up statistics in the resolution of syntactic category ambiguity

This paper investigates how people resolve syntactic category ambiguities when comprehending sentences. It is proposed that people combine: (a) context-dependent syntactic expectations (top–down statistical information) and (b) context-independent lexical-category frequencies of words (bottom–up statistical information) in order to resolve ambiguities in the lexical categories of words. Three self-paced reading experiments were conducted involving the ambiguous word “that” in different syntactic environments in order to test these and other hypotheses. The data support the top–down/bottom–up approach in which the relative frequencies of lexical entries for a word are tabulated independent of context. Data from other experiments from the literature are discussed with respect to the model proposed here.