Cortical Activations During Auditory Verbal Hallucinations in Schizophrenia: A Coordinate-Based Meta-Analysis

Auditory verbal hallucinations (AVHs) constitute severe, incapacitating symptoms of schizophrenia. Despite increasing interest in the functional exploration of AVHs, the available findings remain difficult to integrate because of their considerable variability. The authors' aim was to perform a robust quantitative review of existing functional data in order to elucidate consistent patterns observed during the emergence of AVHs and to orient new pathophysiological models of hallucinations. METHOD: Ten positron emission tomography or functional magnetic resonance imaging studies were selected for the meta-analysis after systematic review. A total of 68 patients with schizophrenia spectrum disorders experiencing AVHs during scanning were included. According to a random-effects activation likelihood estimation algorithm, stereotaxic coordinates of 129 foci, reported as significant in the source studies, were extracted and computed to estimate the brain locations most consistently associated with AVHs across studies (cluster-extent threshold: 200 mm³).

Patients experiencing AVHs demonstrated significantly increased activation likelihoods in a bilateral neural network, including the Broca's area (activation likelihood estimation=1.84×10⁻³), anterior insula (1.78×10⁻³), precentral gyrus (1.46×10⁻³), frontal operculum (1.29×10⁻³), middle and superior temporal gyri (1.59×10⁻³), inferior parietal lobule (1.33×10⁻³), and hippocampus/parahippocampal region (1.90×10⁻³).