  Semantic feedback is an important source of information that a parser could
use to deal with local ambiguities in syntax. However, it is difficult to
devise a systematic communication mechanism for interactive syntax and
semantics. In this article, I propose a variant of left-corner parsing to
define the points at which syntax and semantics should interact, an account of
grammatical relations and thematic roles to define the content of the
communication, and a conflict resolution strategy based on independent
preferences from syntax and semantics. The resulting interactive model has been
implemented in a program called COMPERE and shown to account for a wide variety
of psycholinguistic data on structural and lexical ambiguities.
