What cognitive mechanisms impact language comprehension in individuals with aphasia?
There is converging evidence that there are cognitive nonlinguistic deficits in aphasia and that these cognitive nonlinguistic deficits tend to exacerbate the language impairment of persons with aphasia. For instance, concurrent memory load or on-going interference (even when it is non-linguistic in nature) strongly affects accuracy and speed of linguistic processing in aphasia (Murray, 1999). Generally, the more attention is required to perform a language task, the harder it becomes for individuals with aphasia (Hula & McNeil, 2008). Further, reduced memory capacity negatively impacts language comprehension in aphasia (Wright & Fergadiotos, 2012). Still much remains unknown about joint impact of various cognitive mechanisms or their differential influence on language processing depending on the type of aphasia. The goal of the present study was to investigate the simultaneous influence of different cognitive mechanisms (memory, attention, speed of processing) on auditory language comprehension in individuals with fluent and non-fluent aphasia.