phenotype affects entity Hallucinations UMLS:C0018524 HP:0000738 Perceptions in a conscious and awake state that, in the absence of external stimuli, have qualities of real perception. These perceptions are vivid, substantial, and located in external objective space. SNOMEDCT_US:7011001 UMLS:C0235153 Abnormal experience of reality hallucination increased hallucination