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What is Delusion, Hallucination and Illusion?

Delusion is a false beliefs which cannot be corrected with real facts
Hallucination false perception through a special sense (visual, auditory, olfactory, gustatory) without a stimuli
Illusion is a false interpretation through a special sense with a stimulus.
These are seen in disorders like
  • Temporal lobe epilepsy(TLE) – auditory or olfactory hallucination
  • Delirium tremens result in visual, tactile hallucination (insect crawling)
  • Migraine produce visual aura – scintillating scotoma or teichopsia
  • Occipital lobe lesion produce visual aura
  • GPI (General Paralysis of Insane)