Final answer:
Jason is most likely undergoing a) Dialectical Behavior Therapy (DBT), a form of cognitive-behavioral therapy designed specifically for borderline personality disorder that incorporates mindfulness to help develop a nonjudgmental attitude toward oneself.
Step-by-step explanation:
Jason, who has borderline personality disorder and is undergoing treatment that combines cognitive-behavioral therapy with mindfulness training, and whose sessions focus on helping him develop a nonjudgmental attitude toward himself, is most likely undergoing Dialectical Behavior Therapy (DBT). DBT is a specific type of cognitive-behavioral psychotherapy developed to help better treat borderline personality disorder, and it incorporates strategies such as mindfulness, distress tolerance, emotion regulation, and interpersonal effectiveness. One of the key features of DBT is its emphasis on the psychosocial aspects of treatment, and it frequently involves both individual and group therapy sessions. This form of therapy is particularly effective in individuals with borderline personality disorder, who may experience intense emotions and interpersonal challenges.
Moreover, DBT's focus on mindfulness aligns with the aspect of developing a nonjudgmental attitude, which helps individuals observe and accept their thoughts and feelings without criticism. This unique combination of cognitive-behavioral approaches with mindfulness techniques distinguishes DBT from other therapies such as Gestalt therapy, Rational Emotive Behavior Therapy (REBT), and Psychodynamic therapy, which have different methodologies and theoretical foundations.