An auditory hallucination or the subjective sensation of hearing sounds that have no external source, used in medical terminology.
From Greek akoe (hearing) combined with -asma (a spasm or sudden sensation), forming a compound used in medical Greek to describe pathological hearing experiences.
The brain is so powerful that it can create sounds from nothing—people with certain neurological conditions experience akoasm, and studying it reveals how the brain generates the experience of hearing itself.
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