The goal of this clinical is to learn more about decision making in psychosis spectrum disorders, like schizophrenia. The investigators will ask people who do not have psychosis to take a single dose of modafinil and then complete some brain games on the computer that measure decision making. They 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 play the brain games? Does a single dose of modafinil 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. Take a single dose of modafinil. Complete brain games while wearing an electroencephalography (EEG) cap, before and after taking the single dose of modafinil. EEG measures electrical activity in the brain.
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Test My Brain - Digit Symbol Coding
Timeframe: Baseline
Test My Brain - Digit Symbol Coding
Timeframe: Day 7 (EEG + Modafinil Appointment)
Test My Brain - Verbal Paired Associates Memory
Timeframe: Baseline
Test My Brain - Verbal Paired Associates Memory
Timeframe: Day 7 (EEG + Modafinil Appointment)
Test My Brain - Matrix Reasoning
Timeframe: Baseline
Test My Brain - Matrix Reasoning
Timeframe: Day 7 (EEG + Modafinil Appointment)
Test My Brain - Multiracial Emotion Identification
Timeframe: Baseline
Test My Brain - Multiracial Emotion Identification
Timeframe: Day 7 (EEG + Modafinil Appointment)
Electroencaphalography (EEG) - Resting alpha synchrony
Timeframe: Day 7 (EEG + Modafinil Appointment)
Electroencaphalography (EEG) - Oscillatory frontal gamma synchrony
Timeframe: Day 7 (EEG + Modafinil Appointment)
Electroencaphalography (EEG) - Task-related reward positivity/P900
Timeframe: Day 7 (EEG + Modafinil Appointment)
Electroencaphalography (EEG) - N1 amplitude
Timeframe: Day 7 (EEG + Modafinil Appointment)
Dot Pattern Expectancy variation (TOPX) Task - Accuracy
Timeframe: Day 7 (EEG + Modafinil Appointment)
Dot Pattern Expectancy variation (TOPX) Task - Response Time
Timeframe: Day 7 (EEG + Modafinil Appointment)
Translational Bandit Task (TBT) - Accuracy
Timeframe: Day 7 (EEG + Modafinil Appointment)
Translational Bandit Task (TBT) - Response time
Timeframe: Day 7 (EEG + Modafinil Appointment)
Translational Bandit Task (TBT) - Reward Seeking Behavior
Timeframe: Day 7 (EEG + Modafinil Appointment)