Hearing voices from the outside vs from the inside boils down to brain anatomy: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3004180/ https://www.ncbi.nlm.nih.

Hearing voices from the outside vs from the inside boils down to brain anatomy: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3004180/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3004180/ >Two homogeneous subgroups of patients were defined based on the hallucination spatial location: patients with only outer space hallucinations (N = 12) and patients with only inner space hallucinations (N = 15). Between-group differences were then assessed using 2 complementary brain morphometry approaches: voxel-based morphometry and sulcus-based morphometry. Convergent anatomical differences were detected between the patient subgroups in the right temporoparietal junction (rTPJ).