ISSN : 1226-9654
Impaired working memory (WM) is the most reliably reported cognitive dysfunction in schizophrenia. Past research have revealed that increased novelty or salience of visual stimuli could facilitate the WM process, which is not clear in schizophrenia yet. In the present study, we investigated WM performance of healthy people and patients with schizophrenia using biological motion (BM), which is unique motion stimulli carrying rich social information. Experiment 1 examined WM accuracy for BM and non-BM stimuli in low- and high-memory load conditions. In experiment 2, we investigated WM for BM, non-BM and static polygon stimuli in three different delay conditions. The results showed that overall performance was worse in the patients group. WM accuracy for BM stimuli did not drop and remained higher than those for the other stimuli regardless of increasing memory load and delay in control group. Patients group also showed higher accuracy for BM stimuli than the other stimuli across the conditions but it decreased with incresing load and delay, unlike controls. Our findings suggest that socially-relevant stimuli such as BM could facilitate WM in schizophrenia and it may provide a clue of target for cognitive remediation strategies.
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