The ONOFF project is funded from an ERC Advanced Grant Award to study the underlying neurocognitive and neurochemistry mechanism in auditory hallucinations in schizophrenia. The ONOFF project is a continuation of a previous Advanced Grant, VOICE, also funded by ERC. The ONOFF project focuses on identifying neurobiological markers of fluctuations in hallucinatory experiences, and uses new app-based behavioral techniques as well as a multimodal approach to MR measures.