Schizophrenia is a severe mental disorder that is marked by significant disruption in a person's thought and emotional processes, frequently involving psychotic features. Identifying behavioral changes and symptoms that indicate the beginning stages of schizophrenia is important for early intervention and prevention of a full psychotic episode. These initial symptoms, known as the prodromal symptoms of psychosis, may include odd behaviors, increased social withdrawal, difficulty concentrating, inappropriate emotional responses, suspicion of others, and dramatic sleep and appetite changes. Common treatments for adolescents demonstrating prodromal symptoms include forms of psychotherapy, nutritional training, and low doses of medication. As a form of psychotherapy, neuroadaptive cognitive training exercises delivered on a computer may be the most effective means of remediating the thinking difficulties of adolescents who are experiencing prodromal symptoms and are at risk for developing a first psychotic episode. This study will evaluate the effectiveness of intensive computerized neuroadaptive cognitive training exercises in preventing the onset of psychotic disorder and improving adaptive functioning in adolescents at high risk of schizophrenia.

Participation in this study will last 24 months and will involve both healthy participants and participants at high risk of schizophrenia. Healthy participants will only participate for 12 months. All participants will undergo baseline assessments that will include an interview, written tests, blood draws, and electroencephalogram (EEG) and magnetic resonance imaging (MRI) scans. Participants at high risk of schizophrenia will then be assigned randomly to receive treatment with either computerized neuroadaptive cognitive training or commercially available computer games. Healthy participants will receive treatment with computerized neuroadaptive cognitive training only. All participants will be asked to complete 60-minute sessions of their assigned treatments 5 days per week for 8 weeks. For participants receiving cognitive training, exercises will focus on improving speed and accuracy in the perception of and response to verbal and visuospatial targets. The treatment will focus on targeted cognitive training (TCT). Participants assigned to practice computer games will play standard, commercially available games, with no targeted response.

Participants will repeat baseline assessments at post treatment and Month 6 of follow-up. The EEG and MRI will be repeated only at the Week 8 assessment visit. There will be a blood draw at Week 2 of treatment as well. After the Month 6 assessment, healthy controls will be complete, and the at risk participants will continue to be followed up out to 24 months.