Aphonogelia

Aphonogelia is a rare neuropsychological condition with which a person cannot laugh audibly.[1]

References
  1. Levin, Max (1931). "Inability to Laugh Audibly: Aphonogelia". Archives of Neurology and Psychiatry. 25: 157. doi:10.1001/archneurpsyc.1931.02230010169012.
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