The rapid and accurate use of language is supported by cognitive networks that operate implicity; that is, they are outside of conscious awareness or control. Prior behavioral evidence suggests that the timing of these networks' operations is altered in aphasia. Specifically, evidence suggests that activation within these networks spreads more slowly for people with aphasia than for typical adults, and that it is maintained for a shorter than typical period of time. The purpose of this study is to determine whether there are reliable, measurable neurophysiological correlates of these delays. To do this, we are using EEG measurements of electrical activity in the brain (event-related potentials; ERPs) to study the time-course of neurophysiological responses to information presented through masked priming, which allows implicit processing of the stimuli while precluding or severely limiting explicit, conscious processing. This information may be useful in the future for determining candidacy for particular treatments, or as an early measure of the effects of aphasia therapy in people who are not yet showing behavioral changes.

Not currently enrolling new participants.


Principal Investigator(s): 
Lee Osterhout