Theory of Mind in Adolescents with Bipolar Disorder in Euthymic Phase: ‎Using the Strange Stories Test

Objective: This study evaluated the theory of mind (ToM) in adolescents diagnosed with bipolar disorder ‎‎(BD) during their euthymic period compared to a typically developing (TD) group.‎ Method: The BD group consisted of thirty 11-18 year old inpatients in euthymic phase. The TD ‎group included 30 age, gender, and IQ matched volunteer students. To assess the diagnosis and ‎comorbid disorders, we performed the semi-structured interview of the Kiddie Schedule for Affective Disorders ‎and Schizophrenia-Present and Lifetime Version (K-SADS-PL) for the BD adolescents. To ‎evaluate the severity of attention deficit hyperactivity disorder (ADHD) and mania, Conner's ‎Parent Rating Scale-Revised version (CPRS-R), and Young Mania Rating Scale (YMRS) were ‎used, respectively. Ravens Progressive Matrices was conducted to evaluate intellectual ability in ‎the both groups. Happe Strange Stories test was performed to assess ToM in the participants. Data were ‎analyzed using the independent t-test, analysis of covariance, and Pearson Correlation analysis.‎ Results: The two groups did not show any differences in comprehending the stories; however, the BD ‎group's mentalizing scores were significantly weaker than the TD group (p<0.05).‎‎ Conclusion: The ToM impairments in adolescents with BD may be explained as a trait marker which may lead ‎to continuation of social problems even during remission‏.‏.