Hyperlalia: A right cerebral hemisphere syndrome

Atsushi Yamadori, Yukio Osumi, Masayasu Tabuchi, Etsuro Mori, Takashi Yoshida, Shingo Ohkawa, Yukihiro Yoneda

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We describe a new right hemispheric behavioural syndrome for which we propose the name “hyperlalia”. In a typical case an apparently unconcerned and expressionless patient is easily prompted to remarkable volubility with a content which is loose and incoherent. The voice is low and monotonous. All the lesions confirmed by computed tomography of the brain overlapped in the perisylvian area in the territory of the right middle cerebral artery. Loss of a subtle balance between the left hemispheric speech area and the corresponding area in the right hemisphere caused by acute damage of the right perisylvian area may have resulted in disinhibition of the speech function. Similarities and dissimilarities with the known pathology of talkativeness are also discussed.

Original languageEnglish
Pages (from-to)143-151
Number of pages9
JournalBehavioural Neurology
Issue number3
Publication statusPublished - 1990
Externally publishedYes

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Neurology
  • Clinical Neurology


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