GFAP and Abnormal autonomic nervous system physiology: Nevertheless, five patients belonged to none of the four subgroups (affective organic disorder and NMDAR antibodies (n = 1), GFAP astrocytopathy associated with ego disturbances and visual snow phenomenon (n = 1), somatoform autonomic dysfunction associated with GAD65 autoantibodies (n = 1), depressive disorder associated with amphiphysin autoantibodies (n = 1), and IgLON5 autoimmune encephalitis (n = 1)).