title: Unusual visual experiences reported by subjects in the British Army study of sustained operations, Exercise Early Call.
mesh_terms: D006212:Hallucinations / Q000209:etiology*; D006801:Humans; D008297:Male; D008887:Military Medicine; D008891:Military Science; D010468:Perceptual Disorders / Q000209:etiology; D012892:Sleep Deprivation; D006113:United Kingdom; D014796:Visual Perception