Abstract
This study investigates the effectiveness of Internal Cohesion Psychotherapy (ICP) in enhancing three dimensions of the intrapersonal system: self-regulation, self-esteem, and motivation among youth with diagnosed mood disorders. Using a mixed-methods approach, quantitative data were collected through pre- and post-intervention assessments from 82 clients (63 females, 19 males). In contrast, qualitative data from semi-structured interviews with 20 clients (15 females, 5 males) provided deeper insights into participants' experiences. Results from linear mixed models showed significant improvements in self-regulation, self-esteem, and motivation of the youth clients after the Internal Cohesion Psychotherapy treatment that they received. Qualitative findings underscored the practical and emotional transformations facilitated by ICP, revealing some important features of this therapeutic approach, which positively influenced emotional regulation, self-confidence, and motivation, thus improving the overall intrapersonal system. This research highlights the potential of ICP to promote positive mental health outcomes by addressing intrapersonal dimensions.