a single-subject study to examine the effects of constrained-induced aphasia therapy on naming deficit

aphasia is prevalent in people following stroke, which can have a significant impact on the quality of life of the patients with stroke. one of the new methods for treatment of patients with aphasia is constraint‑induced aphasia therapy (ciat). the aim of this study was to investigate the efficacy of ciat on naming deficits in individuals with chronic aphasia. this study had a prospective, single‑subject study with a‑b‑a design. the ciat was administered to two patients with chronic aphasia. participants were a 57‑year‑old male and a 45‑year‑old female and had a stroke 60 and 36 months ago, respectively. in this study, the naming test was used as the outcome measure. the naming test was administered in three baseline sessions with 1 week interval between tests (phase a). patients received ciat for four consecutive weeks (3 days/week). four measurements were taken during the treatment phase (phase b). in follow‑up phase (phase a) two other measurements were performed. visual analysis consisting of level, regression line, and variability were used to determine the effects of ciat on naming. both participants increased scores on naming test after phase a and b. the mean of the naming score improved from the baseline to the intervention phase in both participants. there was a positive trend in naming scores during the treatment phase compared with the trend in the baseline demonstrated by both participants. the results of this study showed that the ciat can be effective in improving the naming deficit in patients with chronic post‑stroke aphasia.