Hallucinations

False sensory perceptions (visual, auditory, olfactory, gustatory, tactile, or visceral) occurring in the absence of corresponding external stimuli, experienced with the vividness and immediacy of true perception and with preserved subjective conviction of reality. Possible causes are psychiatric disorders (schizophrenia, bipolar, depression), neurological conditions (Alzheimer's dementia, Parkinson's disease, epilepsia, migraines, vision/hearing loss, Charles Bonnet syndrome), drugs (LSC, psilocybin, cannabis, stimulants, alcohol withdrawal/delirium tremens, sedatives, corticosteroids, dopamine-agonist), sleep deprivation, severe illness (fever, infection, dehydration), or sensory isolation.