Avatar-mediated Therapy Versus Cognitive Behavioural Therapy for Persisting Experiences of Hearing Voices

Inclusion Criteria: * Schizophrenia-related disorder or a mood disorder with psychotic symptoms diagnosis confirmed using the Structured Clinical Interview for DSM (SCID) * Experiencing current auditory verbal hallucinations as measured by the Positive and Negative Syndrome Scale (PANSS) item P3 ≥ 4 * Auditory verbal hallucinations present for at least one year * AVHs include significant negative content (PSYRATS item 6 ≥ 2) and/or AVHs are distressing (PSYRATS item item 9 ≥ 2) * Current treatment with antipsychotic medication, or has been treated with antipsychotic medication in the past, with at least two different antipsychotic compounds, and these have been discontinued due to insufficient treatment response and/or poor tolerability. * Access to the internet and a computer or other device on which videoconferencing software can be used * Sufficient fluency in English for meaningful participation * Age 18 or over * Ability to give informed consent Exclusion Criteria: * Auditory verbal hallucinations attributable to a primary substance use disorder or organic disorder * Estimated full scale IQ \< 70 (using the Test of Premorbid Functioning, TOPF) * Within the last month or planned at the time of intake: a change of antipsychotic medication, * Current or within the past 3 months receipt of individual psychological therapy for hearing voices, or receipt of electro-convulsive therapy or other brain stimulation treatment; * AVHs in a language not spoken by the therapists.