The findings point to three hallucination 'subtypes' with different symptom profile. The VH+AH combination signals greater psychopathology and a less favourable prognosis, than hallucinations occurring in isolation, and no hallucinations. This conclusion points to one common mechanism for all hallucinations, which can separate into distinct pathways and modalities. For a more complete clinical picture, clinicians should carefully probe for both auditory and VHs in presenting patients.

Appendix 1. Monitoring Well MW01 field notes-Field instrument calibration notes, general project notes, groundwater-quality notes for samples 1 and 2, alkalinity/acid neutralizing capacity titration field notes and results (figures 1.1.1-1.3.2

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