title: A new sign of callosal disconnection syndrome: agonistic dyspraxia. A case study.
abstract: We report a patient with callosal haemorrhage and no extracallosal involvement who developed a unique form of intermanual conflict. In the acute phase the patient showed a mild speech disturbance and right hemiparesis, and in her right hand, a grasp reflex and compulsive manipulation of tools, all attributable to transient frontal involvement. In the chronic phase there was intermanual conflict occasionally associated with the sensation of a second left hand. The patient also presented a sign consisting of compulsive, automatic execution of orders by one hand (the left or the right) when the patient was specifically asked to perform the movement with the other hand (the right or the left, respectively). There was no left-right confusion in this patient. We call this condition agonistic dyspraxia. In contrast with diagonistic dyspraxia, this consists of the agonistic behaviour of the other hand under conditions in which the hand that has been instructed to respond cannot execute the request.
authors.affiliation: Departamento de Ciencias Neurológicas, Universidad de Chile, Santiago, Chile.
authors.forename: Manuel
authors.initials: M
authors.lastname: Lavados
authors.forename: Ximena
authors.initials: X
authors.lastname: Carrasco
authors.forename: Marcela
authors.initials: M
authors.lastname: Peña
authors.forename: Eran
authors.initials: E
authors.lastname: Zaidel
authors.forename: Dahlia
authors.initials: D
authors.lastname: Zaidel
authors.forename: Francisco
authors.initials: F
authors.lastname: Aboitiz
mesh_terms: D000328:Adult; D001072:Apraxias / Q000175:diagnosis / Q000503:physiopathology* / Q000523:psychology; D002543:Cerebral Hemorrhage / Q000503:physiopathology* / Q000523:psychology; D003337:Corpus Callosum; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006225:Hand / Q000502:physiology; D006801:Humans; D008279:Magnetic Resonance Imaging; D009483:Neuropsychological Tests; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time