Background: Aphasia is an acquired neurogenic language disorder, typically following a stroke in the left hemisphere of the brain. Successful communication requires interaction between implicit unconscious and explicit conscious processing, with people with aphasia (PWA) often showing intact implicit processing without showing explicit competence . This may be related to a problem with the interaction between the two systems. While aphasia is known as a disorder specific to language, there is growing evidence that PWA also have impairments in other cognitive functions. This study investigates this question through assessing the performance of people with aphasia and typical controls on linguistic and non-linguistic versions of a visual perception task. The research questions (RQs) are whether there is a difference in the speed at which PWA and typical adults can detect: RQ1) real words and RQ2) non-linguistic stimuli. Method: Participants were screened for adequate hearing, vision, and cognition. All participants completed a presence/absence judgment task with visual stimuli presented amongst interfering (masking) stimuli at varying exposure durations. Presentation began with longer durations that were easy to see and were then systematically reduced until chance performance occurred. Stimuli included real words (RW) and strings of non-linguistic symbols (NL). Visibility thresholds, reflecting the point at which participants were no longer aware of the presence of visual information, were determined based on the exposure duration at which each participant consistently showed chance performance on the task. Results: To date, data from 2 PWA show an average threshold of 60 ms for RW stimuli and 80 ms for NL stimuli. Five typical controls show an average of 55 ms for RW stimuli and 35 ms for NL. Data collection is ongoing. Conclusion: Data to date suggest that PWA show higher detection thresholds than typical controls for both RW and NL stimuli. This suggests that PWA have impairments that span linguistic and non-linguistic domains. Further data collection is ongoing to add confidence to this conclusion.