In this study a simulated, sensitive video-based instrument for the evaluation of social cognition of schizophrenia was developed: The Assessment tool of Social Cognitive Ability for Schizophrenia (ASCAS). Realization of the instrument entailed the development of scripts, the scenes of the actual movie steering actors and post processing of the video clips with subsequent test-formating. The ASCAS was operationalized social cognition through video, approximating social interactions the way they actually happen in everyday life. The psychometric adequacy of ASCAS was investigated by the use of item-response model (two parameter logistic models). The data were analysed by LTM (latent trait models under IRT) 0.7-1module. The internal consistency, interrater reliability and convergent validity was analyzed by SPSS 12.0K for windows. Major findings of this study were as follows: Test of goodness-of-fit was revealed that items of ASCAS were fitted for two parameter logistic model. The item difficulty parameter of ASCAS expressed that the difficulty level of item is low and the discrimination parameter showed that items of ASCAS distinguished between subjects with low/high standing in this scale. According to the Test Information Curve the items asked in ASCAS provided information for subjects with low ability. The internal consistency(.91) and the interrater reliability(.78) were pertinent. Through the ASCAS factors related with social cognition were examined. Results showed that negative symptoms and general social functioning were correlated with social cognition.
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