The goal of this clinical trial is to learn more about decision making in psychosis spectrum disorders, like schizophrenia. Participants will be people who have had symptoms of a psychosis spectrum disorder start within the last five years. The investigators will study how two study agents change decision making in people with psychosis, by asking participants to complete some brain games on the computer before and after taking the study agents. The investigators hope to improve our understanding of psychosis to help people in the future. The main research questions are: * Does a single dose of modafinil change how people with psychosis play the brain games? * Does a single dose of d-serine change how people with psychosis play the brain games? * Does a single dose of modafinil change brain activity? * Does a single dose of d-serine change brain activity? Participants will: * Complete an interview and self-report questionnaires. * Complete safety screening activities, like a blood draw, a urine drug test, and an alcohol breathalyzer test. * Complete functional Magnetic Resonance Imaging (fMRI) scans. fMRI uses magnets to take pictures of the brain. There will be six scanning appointments in the study, with two scans each. Appointments will be about a month apart. * Take a single dose of a study agent during each scanning appointment. The study agent will be taken after the first fMRI. There are three study agents in total: modafinil, d-serine, and a placebo. Each participant will take each study agent twice during the study. * Play brain games on a computer that measure decision making, thinking, and problem solving skills
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Test My Brain - Digit Symbol Coding
Timeframe: Baseline
Test My Brain - Digit Symbol Coding
Timeframe: Day 7 (fMRI 1)
Test My Brain - Digit Symbol Coding
Timeframe: Day 36 (fMRI 2)
Test My Brain - Digit Symbol Coding
Timeframe: Day 63 (fMRI 3)
Test My Brain - Digit Symbol Coding
Timeframe: Day 91 (fMRI 4)
Test My Brain - Digit Symbol Coding
Timeframe: Day 119 (fMRI 5)
Test My Brain - Digit Symbol Coding
Timeframe: Day 147 (fMRI 6)
Test My Brain - Verbal Paired Associates Memory
Timeframe: Baseline
Test My Brain - Verbal Paired Associates Memory
Timeframe: Day 7 (fMRI 1)
Test My Brain - Verbal Paired Associates Memory
Timeframe: Day 36 (fMRI 2)
Test My Brain - Verbal Paired Associates Memory
Timeframe: Day 63 (fMRI 3)
Test My Brain - Verbal Paired Associates Memory
Timeframe: Day 91 (fMRI 4)
Test My Brain - Verbal Paired Associates Memory
Timeframe: Day 119 (fMRI 5)
Test My Brain - Verbal Paired Associates Memory
Timeframe: Day 147 (fMRI 6)
Test My Brain - Matrix Reasoning
Timeframe: Baseline
Test My Brain - Matrix Reasoning
Timeframe: Day 7 (fMRI 1)
Test My Brain - Matrix Reasoning
Timeframe: Day 36 (fMRI 2)
Test My Brain - Matrix Reasoning
Timeframe: Day 63 (fMRI 3)
Test My Brain - Matrix Reasoning
Timeframe: Day 91 (fMRI 4)
Test My Brain - Matrix Reasoning
Timeframe: Day 119 (fMRI 5)
Test My Brain - Matrix Reasoning
Timeframe: Day 147 (fMRI 6)
Test My Brain - Multiracial Emotion Identification
Timeframe: Baseline
Test My Brain - Multiracial Emotion Identification
Timeframe: Day 7 (fMRI 1)
Test My Brain - Multiracial Emotion Identification
Timeframe: Day 36 (fMRI 2)
Test My Brain - Multiracial Emotion Identification
Timeframe: Day 63 (fMRI 3)
Test My Brain - Multiracial Emotion Identification
Timeframe: Day 91 (fMRI 4)
Test My Brain - Multiracial Emotion Identification
Timeframe: Day 119 (fMRI 5)
Test My Brain - Multiracial Emotion Identification
Timeframe: Day 147 (fMRI 6)
Resting-state functional connectivity
Timeframe: Day 7 (fMRI 1)
Resting-state functional connectivity
Timeframe: Day 36 (fMRI 2)
Resting-state functional connectivity
Timeframe: Day 63 (fMRI 3)
Resting-state functional connectivity
Timeframe: Day 91 (fMRI 4)
Resting-state functional connectivity
Timeframe: Day 119 (fMRI 5)
Resting-state functional connectivity
Timeframe: Day 147 (fMRI 6)
Dot Pattern Expectancy variation (TOPX) task performance
Timeframe: Day 7 (fMRI 1)
Dot Pattern Expectancy variation (TOPX) task performance
Timeframe: Day 36 (fMRI 2)
Dot Pattern Expectancy variation (TOPX) task performance
Timeframe: Day 63 (fMRI 3)
Dot Pattern Expectancy variation (TOPX) task performance
Timeframe: Day 91 (fMRI 4)
Dot Pattern Expectancy variation (TOPX) task performance
Timeframe: Day 119 (fMRI 5)
Dot Pattern Expectancy variation (TOPX) task performance
Timeframe: Day 147 (fMRI 6)
Translational Bandit Task (TBT) Performance
Timeframe: Day 7 (fMRI 1)
Translational Bandit Task (TBT) Performance
Timeframe: Day 36 (fMRI 2)
Translational Bandit Task (TBT) Performance
Timeframe: Day 63 (fMRI 3)
Translational Bandit Task (TBT) Performance
Timeframe: Day 91 (fMRI 4)
Translational Bandit Task (TBT) Performance
Timeframe: Day 119 (fMRI 5)
Translational Bandit Task (TBT) Performance
Timeframe: Day 147 (fMRI 6)