Effects of Aphasia Identification Cards on Service Workers' Comprehension of People With Aphasia

The goal of this clinical trial is to learn whether healthy volunteers are more successful at understanding people with aphasia if they have first viewed an aphasia identification (ID) card. The main questions this study aims to answer are: * Does viewing an aphasia ID card improve healthy volunteers' understanding of the language errors made by people with aphasia? * Does viewing an aphasia ID card improve healthy volunteers' understanding of people with aphasia who make long pauses in their speech? Researchers will compare aphasia ID cards to a control condition (no ID card) to see whether aphasia ID cards improve healthy volunteers' understanding. Healthy volunteers will visit the study site for a single session (about 2 hours long). During the session they will: * Complete brief tests of their vision, hearing and thinking * Listen to sentences produced by a speaker with aphasia w