Hyperlalia: a right cerebral hemisphere syndrome.
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.
Neurology Service, Hyogo Brain and Heart Center at Himeji, 520 Saisho-Ko, Himeji, Hyogo-Ken, 670, Japan.
A
A
Yamadori
Neurology Service, Hyogo Brain and Heart Center at Himeji, 520 Saisho-Ko, Himeji, Hyogo-Ken, 670, Japan.
Y
Y
Osumi
Neurology Service, Hyogo Brain and Heart Center at Himeji, 520 Saisho-Ko, Himeji, Hyogo-Ken, 670, Japan.
M
M
Tabuchi
Neurology Service, Hyogo Brain and Heart Center at Himeji, 520 Saisho-Ko, Himeji, Hyogo-Ken, 670, Japan.
E
E
Mori
Neurology Service, Hyogo Brain and Heart Center at Himeji, 520 Saisho-Ko, Himeji, Hyogo-Ken, 670, Japan.
T
T
Yoshida
Neurology Service, Hyogo Brain and Heart Center at Himeji, 520 Saisho-Ko, Himeji, Hyogo-Ken, 670, Japan.
S
S
Ohkawa
Neurology Service, Hyogo Brain and Heart Center at Himeji, 520 Saisho-Ko, Himeji, Hyogo-Ken, 670, Japan.
Y
Y
Yoneda