(Ph.D., University of Kansas) Dr. Simpson's researches how when we read, marks on a page are rapidly and automatically translated into ideas in the mind. He and his students are trying to understand the psychological pathway that exists between these beginning and ending states. They have explored several aspects of people's word-recognition processes, including the effects of context on processing the meanings of ambiguous words and the role of phonology in word recognition. They have examined word recognition developmentally (comparing beginning and adult readers) and in two languages (English and Korean). Recent research has examined the interaction of semantic and phonological variables in word recognition, by investigating processing as a function of a word's "neighborhoods" (i.e., the number of words that share orthographic, phonological, or semantic information with a target word). His current research investigates how semantics and word morphology interact, examining how compound words activate their constituents and words related to those constituents.