Hallucination or Illusion? Spot Difference

9 Sep, 2025

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Hallucination: Perception occurs without any external stimulus (seeing/hearing something that isn’t there). Illusion: Misperception of a real external stimulus (a rope mistaken for a snake).

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Nature of Perception

Hallucination: Entirely imaginary, created by the mind. Illusion: Has a real object or stimulus, but it is perceived incorrectly.

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Reality Basis

Hallucination: Often linked to mental disorders, neurological conditions, or substance use. Illusion: Usually caused by sensory errors, poor lighting, distance, or cognitive expectations.

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Cause

Hallucination: Can be visual, auditory, tactile, olfactory, or gustatory. Illusion: Primarily visual or auditory distortions.

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Types

Hallucination: Cannot be corrected by reasoning or evidence since there’s no real stimulus. Illusion: Can be corrected once the true nature of the stimulus is recognised.

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Correction