The goal of this clinical trial is to test the efficacy of a transdiagnostic Internet-delivered interventions for Romanian adolescents with anxiety and/ or depression. The main questions it aims to answer are:
* What is the clinical efficacy of the Internet-delivered intervention? * How accurate is the prediction model in predicting who will respond to treatment? Participants will undergo non-invasive fMRI to measure variability in brain signal as a proxy of the neural systems' adaptability before receiving the intervention, then they will be allocated either to the Internet-delivered intervention or control group.
elevated symptoms of anxiety or depression/ internalizing problems (T score> 60) at intake (based on Youth self-report completed by adolescents)
primary diagnosis of an anxiety/depressive disorder based on DSM-5 criteria according to ADIS-5-C/P interview
age 13-17
able to read and understand Romanian language
severe mental disorder (psychosis, severe depression, bipolar disorder, based on clinical interview)
any condition that interferes with the protocol implementation (e.g., physical illness or sensory impairment that interferes with behavioral tasks such as exposure, behavioral activation, unavailable for the next 3 months),
active suicidal ideation (assessed by child psychiatrist during clinical interview) in the last month
currently following CBT/ psychotherapy for anxiety/depression, in the last 6 months