Using determinism to predict garden paths

I am interested in making a psychologically valid model of human natural language understanding, and especially in a processing model for predicting when a sentence will be a garden path. While extending the Marcus deterministic parser to include noun-noun modification, several counter examples to Marcus' garden path prediction were found. In this paper I propose that when people encounter an ambigous situation that may lead to a garden path, they use semantics to decide rather than look ahead. I will present an extension to the garden path prediction mechanism of Marcus' parser to account for this and several experiments to test this theory.