This dissertation examines the processing of sentences involving long-distance linguistic dependencies, or sentences containing elements that must be linked across intervening words and phrases. Specifically, both behavioral (self-paced reading and eye tracking) and neurophysiological (electroencephalography) methods were used (a) to evaluate the relative importance of backward- and forward-looking dependency satisfaction processes in the comprehension of sentences involving wh-dependencies and (b) to determine the extent to which common neurocognitive mechanisms are involved the processing of wh- and anaphoric dependencies. With respect to the first issue, both behavioral andneurophysiological results indicated a core role for forward-looking, expectancy-based processes in the comprehension of wh-dependency sentences. Regarding the latter issue, despite considerable overlap in the reading patterns associated with wh-dependencies and (at least some types of) anaphora, the neurophysiological responses related to these dependency types indicated that their processing draws on distinct neurocognitive mechanisms.

This study explored the relationship between syntax and semantics in an effort to provide evidence against a strict theory of the Autonomy of Syntax. The evidence was provided by an acceptability survey given to 20 native, adult Mexicans who ranked both declarative and wh-questions which manifested a filler-gap relationship where the gap was located in an embedded noun clause. The main verbs were controlled for semantic depth by being ranked within verbal categories according to external evidence of markedness or semantic depth. The primary hypothesis was that semantically deeper verbs would add to the already increased strain on working memory associated with filler-gap processing, thereby resulting in decreased acceptability. The results of the survey showed that, while this hypothesis held true to some degree, further research will be required to confirm the results and to further understand the intricate interactions between syntax and semantics.