PAT is a 15-week cognitive-behavioral therapy that focuses on increasing reward motivation and sensitivity at the neural, behavioral, and affective levels of analysis. These observed effects occur through PAT's effects on reward sensitivity and positive affect. Participants will be assigned to a therapist with training in cognitive-behavioral therapy who will meet with them weekly via telehealth.

Participants randomized to SUP will receive 15 weeks of SUP from a doctoral student in clinical psychology. SUP is a flexibly-delivered, manualized evidence-based treatment that focuses on reinforcing a patient's existing coping strategies while fostering a positive therapeutic relationship. Supportive psychotherapy provides a time, attention, and social support control that is similar to a placebo but likely to be perceived as relevant to this population.

PAT includes 15 weekly, 1-hour sessions. The treatment is composed of three modules targeting behaviors (Sessions 1-7), cognitions (Sessions 8 -10), and compassion (Sessions 11-14), with skills being reinforced in a cumulative manner in subsequent sessions. The final session in the original treatment (Session 15) addressed relapse prevention, which will be adapted to focus on further reinforcing and generalizing learned skills. The treatment includes guided activities that target different aspects of positive affectivity such as reward approach-motivation, reward learning, and reward attainment.

Reynolds Adolescent Depression Scale 2nd Edition - anhedonia subscale score; Scores can range from 7-28 with higher values indicating more severe anhedonia.

Reward motivation will be assessed behaviorally with the Effort Expenditures for Reward Task (EEfRT). The EEfRT assesses reward sensitivity by compelling participants to choose to engage in high and low effort motor tasks for varying potential monetary gains and computes reward sensitivity as the difference in propensity to choose hard choice trials at increasing trial values.

C-reactive protein concentrations measured in saliva; assay detection range is approximately 25 pg/mL - 1600 pg/mL with higher values indicating the presence of more systemic inflammation.

Self-reported reward sensitivity will be assessed using the 21-item Positive Valence System Scale (PVSS-21) which will be assessed at study enrollment, and then 4-, 8-, and 12-months after study enrollment. For each item, responses can range from 1-8, and the questionnaire is scored using a sum. Total scores can range from 21 - 189 and lower scores reflect a worse outcome.

Degree of expression of 19 pro-inflammatory genes as measured via genome-wide transcriptional profiling of RNA from peripheral blood mononuclear cells. Values are expressed as z-scores, and higher values indicate greater average expression of pro-inflammatory genes.

Positive and negative affect Schedule (PANAS) - positive affect subscale score; scores can range from 10 to 50 with higher values indicating more positive affect.