The Ambulatory Research in Cognition (ARC) app was designed by the Cognitive Technology Research Laboratory (CTRLab) in the Department of Neurology at Washington University in St. Louis (WUSTL). The WU PARC app has been slightly modified for use in youth to assess cognition using brief, frequently administered game-like cognitive tests. This app is intended for use only by participants enrolled in WUSTL PARC in the Wild studies.