Measuring negative symptoms in patients with schizophrenia: reliability and validity of the Korean version of the Motivation and Pleasure Scale-Self-Report.
BACKGROUND
The Clinical Assessment Interview for Negative Symptoms (CAINS) is one of the validated interview measures of negative symptoms in psychotic disorders. The Motivation and Pleasure Scale-Self-Report (MPSR) is a self-report measure that assesses the motivation and pleasure domains of negative symptoms based on the CAINS. This study evaluated the reliability and validity of a Korean version of the MPSR.


METHODS
A total of 139 patients with schizophrenia completed the MPSR, CAINS, Scale for the Assessment of Negative Symptoms (SANS), Brief Psychiatric Rating Scales, Calgary Depression Scale for Schizophrenia, and other measures of trait and cognitive function.


RESULTS
The 15-item MPSR showed good internal consistency. In addition, it also had a good convergent validity with the Motivation and Pleasure subscale of the CAINS and the anhedonia/avolition subscale of the SANS. The scale was not associated with psychotic symptoms, agitation/mania, and depression/anxiety, and it showed good discriminant validity. MPSR scores were significantly correlated with Behavioral Activation System total score for trait measure.


CONCLUSIONS
The Korean version of the MPSR is a notable self-report method for examining the severity of negative symptoms in schizophrenia.
Clinical Emotion and Cognition Research Laboratory, Goyang, Republic of Korea.
Ji-Sun
JS
Kim
Clinical Emotion and Cognition Research Laboratory, Goyang, Republic of Korea.
Seon-Kyeong
SK
Jang
Department of Psychiatry, Inje University Haeundae Paik Hospital, Busan, Republic of Korea.
Seon-Cheol
SC
Park
Department of Psychiatry, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Republic of Korea.
Jung-Seo
JS
Yi
Department of Rehabilitation Psychology, Daegu University, Daegu, Republic of Korea.
Joong-Kyu
JK
Park
Department of Psychiatry, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea.
Jung Suk
JS
Lee
Department of Psychology, Korea University, Seoul, Republic of Korea.
Kee-Hong
KH
Choi
Clinical Emotion and Cognition Research Laboratory, Goyang, Republic of Korea; Department of Psychiatry, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Republic of Korea.
Seung-Hwan
SH
Lee
CAINS; Korean version of the MPSR; negative symptoms; reliability; validity