Hemispheric Disconnection Syndrome

Disconnection Syndrome

Neurology A general term for a cortical 'disconnect' between two regions of the brain, one of which involves the cortex. The disconnection may be horizontal, as in the corticocortical disconnection syndrome described by Geshwind, or vertical, which involves a disruption of the long myelinated pathway from the upper brain stem projecting into the cortex, described by Christiansen and Uzzell as a reticulofrontal disconnection syndrome, which in their patient was characterised by disinhibition, loss of interest in all things that had previously been important to the patient, and lack of insight
Psychiatry See Dissociative syndrome

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hemispheric disconnection syndrome

Neurology A functional dissociation between the right and left cerebral hemispheres, such that one hand does not visually or tactually recognize that which is presented to the ipsilateral hemisphere Clinical Tactile agnosia, ideomotor dyspraxia, agraphia of left hand and constructional apraxia of right hand