Event Marker Ingested To Trigger Event Recorder 3.0 Psychiatry Study

Inclusion Criteria: * Male or female ≥ 18 and ≤ 65 years of age * Meet Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria, by Structured Clinical Interview using DSM-IV SCID-I/P1, for either: i. Bipolar disorder I, II, or Not Otherwise Specified (NOS), or ii. Schizophrenia or schizoaffective disorder * Clinical global impression scale-severity (CGI-S) of 3 or below * Currently on a stable regimen of oral antimanic or antipsychotic medication for at least 3 months * No anticipation to change or titrate the regimen in the next 28 days * Willingness to adhere to study procedures * Capacity to provide informed consent Exclusion Criteria: * Pregnancy, or women of child bearing potential who are not using a medically accepted means of contraception * Serious suicide or homicide risk, as assessed by evaluating clinician * Unstable medical illness including cardiovascular, hepatic, renal, respiratory, endocrine, neurological, or hematological disease * DSM-IV diagnoses or symptoms of substance use disorders, active within the last 60 days * A score of 3 or higher on the suspiciousness/paranoia item of the Brief Psychiatric Rating Scale (BPRS) * Acute, clinically significant gastrointestinal symptoms, such as nausea, vomiting, abdominal pain, diarrhea, melena, or hematochezia * History of significant gastrointestinal disease or major gastrointestinal surgery * Clinical instability of any kind that, in the investigator's opinion, could preclude safe participation in the study * Known allergies that could preclude safe participation in the study * Current presence of an electronically active implanted medical device * Participation in another medical device study, or on any investigational drug or device within the last 30 days * Inability to obtain consent