Eye movements as a window into real-time spoken language comprehension in natural contexts

When listeners follow spoken instructions to manipulate real objects, their eye movements to the objects are closely time locked to the referring words. We review five experiments showing that this time-locked characteristic of eye movements provides a detailed profile of the processes that underlie real-time spoken language comprehension. Together, the first four experiments showed that listeners immediately integrated lexical, sublexical, and prosodic information in the spoken input with information from the visual context to reduce the set of referents to the intended one. The fifth experiment demonstrated that a visual referential context affected the initial structuring of the linguistic input, eliminating even strong syntactic preferences that result in clear garden paths when the referential context is introduced linguistically. We argue that context affected the earliest moments of language processing because it was highly accessible and relevant to the behavioral goals of the listener.