Aphasiology最新文献

Background: A greater amount of education is known to positively impact language skills in neurotypical populations, but its influence on language outcomes and recovery after stroke remains unclear.

Aims: This study of 749 stroke survivors, with and without aphasia, investigated (A) which aphasia assessment tasks benefitted most from more pre-stroke education; and whether the effect of education (B) differs for aphasic and non-aphasic participants or other stroke and non-stroke-related variables, and/or (C) facilitates recovery from post-stroke aphasia.

Methods: Participants ranged from one month to 42 years post-stroke. They were assessed using (i) the Comprehensive Aphasia Test (CAT), and (ii) self-report questionnaires that measured speech production, comprehension, reading, and writing at one week and one year post-stroke. Multiple regression analyses investigated the effect of education amount, and its interaction with other variables, on language outcomes and recovery. Bayesian statistics assessed the strength of the evidence for any observed effects. Many variables including lesion size, age at stroke, and initial severity were controlled for.

Results: (A) More years of formal education were associated with better overall language skills, with significant, albeit small effects found for semantic and letter fluency (β = 0.123 and 0.166) and spoken picture description, specifically, the number of words produced (β = 0.085) and grammatical well-formedness (β = 0.087). (B) The benefit of more pre-stroke education was mostly additive with the effects of other variables including initial aphasia severity and left hemisphere lesion size, but was reduced in older participants who had large lesions with severe initial symptoms. Finally, (C) no significant effect of education on language recovery was observed.

Conclusion: More pre-stroke formal education is associated with higher post-stroke language scores on a wide range of tasks for both aphasic and non-aphasic participants, but, in participants with large lesions that cause severe aphasia, this advantage diminishes with age. These results suggest a generic benefit of education on language test performance rather than a specific role of pre-stroke education in aiding language outcomes and recovery. An individual's educational background should therefore be considered when interpreting assessment scores.

Background: Eye movements reflect the cognitive-linguistic processing of neurotypical readers. Numerous reading related eye movement measures are associated with language processing, including first fixation duration, gaze duration, number of fixations, word skipping, and regressions. Eye movements have also been used to examine reading in neuro-atypical populations including persons with aphasia (PWA).

Aims: This study aimed to determine whether eye movement measures obtained from connected text reading differ among persons with varying types of aphasia and neurotypical individuals, as well as whether eye movement measures are associated with language processing severity and reading comprehension ability in PWA.

Methods: Twenty-four PWA and twenty-four age-matched control participants completed a connected text-reading eye-tracking task. The PWA also completed assessments to evaluate overall language processing severity and reading comprehension skills and to identify specific subtypes of aphasia.

Results: Persons with aphasia had shorter gaze duration, longer regression duration, and made more fixations than control participants, while no group differences emerged for first fixation duration or word skipping. Eye movement patterns did not differ among participants with anomic, Broca's, or conduction/Wernicke's. Language severity scores were a significant factor for gaze duration, while reading comprehension scores were not a significant factor for the eye movement measures examined.

Conclusions: The findings support previous eye tracking literature that indicate different eye movement patterns for persons with aphasia during text reading relative to neurotypical controls. The findings also highlight that the selection of eye movement measures examined, the stimuli used, and procedural considerations may impact the pattern of results. The results from this study can be used to further determine which eye movement measures may be most suited for studying language processing during reading in neuro-atypical individuals and determine whether persons with aphasia use different strategies for reading comprehension than neurotypical individuals.