気分障害における階層的クラスター分析による再現可能な特性アプローチ・回避動機プロファイルと異種性の機能不全の解明

Mood disorders such as major depressive disorder (MDD) and bipolar disorder (BD) are characterized by core approach and avoidance (AA) motivational system dysfunction. However, mood disorders are characterized by markedly heterogeneous patterns of AA motivation dysfunction across studies, which suggests that mood disorders may be characterized by multiple distinct patterns of AA motivation dysfunction. Thus, we utilized hierarchical cluster analysis (HCA) to classify multiple, distinct AA motivational profiles in both healthy control samples (Study 1: n = 431 and n = 462) and patients with MDD or BD (Study 2: n = 111). In both healthy control and clinical samples, we identified and replicated three distinct AA motivational profiles generally characterized as 1). High Approach + Moderate Avoid, 2). Low Approach + Low Avoid, or 3). Low Approach + High Avoid. In both studies, AA motivational profiles were further characterized by multivariate differences in self-reported reward and threat sensitivity. Compared to healthy controls, patients with mood disorders exhibited AA motivation dysfunction that systematically varied in severity across AA motivational profiles. Together, these results suggest that mood disorders may be more accurately characterized by multiple, distinct patterns of AA motivational dysfunction, which may ultimately be useful towards informing precision-medicine frameworks.