Resting-state EEG in schizophrenia: Auditory verbal hallucinations are related to shortening of specific microstates

ObjectiveAbnormal perceptions and cognitions in schizophrenia might be related to abnormal resting states of the brain. Previous research found that a specific class (class D) of sub-second electroencephalography (EEG) microstates was shortened in schizophrenia. This shortening correlated with positive symptoms. We questioned if this reflected positive psychotic traits or present psychopathology.MethodsResting-state EEGs of frequently hallucinating patients, indicating on- and offset of hallucinations by button press, were analyzed. Microstate class D duration was related to spontaneous within-subject fluctuations of auditory hallucinations.ResultsMicrostate D was significantly shorter in periods with hallucinations.ConclusionsMicrostates of class D resemble topographies associated with error monitoring. Its premature termination may facilitate the misattribution of self-generated inner speech to external sources during hallucinations.SignificanceThese results suggest that microstate D represents a biological state marker for hallucinatory experiences.