The theory of callosal failure in schizophrenia is examined using the test for left-hand anomia. It is argued that if the corpus callosum is affected in schizophrenia with consequent difficulty of transmission between the two sides of the brain, a greater number of left-hand errors should be found in producing the names of objects held by that hand because the speech area of the left hemisphere is no longer available for the description of the perceptions of the left hand. The findings support this view and they confirm the communication failures of the brain related to callosal disturbance.
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Improvement in callosal disconnection syndrome with recovery of callosal connectivity.
Neurocase
June 2021
Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku University School of Medicine, Sendai, Japan.
Recent advancements in radiological techniques have enabled the observation of the topographic distribution of the human corpus callosum. However, its functional connectivity remains to be elucidated. The symptoms of callosal disconnection syndrome (CDS) can potentially reveal the functional connections between the cerebral hemispheres.
View Article and Find Full Text PDFCallosal Motor Impersistence: A Novel Disconnection Syndrome.
Cogn Behav Neurol
June 2017
*Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea †Neuroscience Center, Samsung Medical Center, Seoul, Republic of Korea ‡Department of Clinical Research Design and Evaluation ¶Department of Health Sciences and Technology, Samsung Advanced Institute for Health Science and Technology, Sungkyunkwan University, Seoul, Republic of Korea §Department of Neurology, University of Florida, Gainesville, Florida ∥Veterans Affairs Medical Center, Gainesville, Florida.
Motor impersistence, an inability to sustain a certain position or movement, is a motor-intentional disorder, caused more often by right than left hemisphere lesions. Since the right hemisphere is dominant for mediating motor persistence, callosal lesions that disconnect the left hemisphere from the right may induce impersistence of the right upper and lower limbs. After an undiagnosed left callosal infarction, a 65-year-old right-handed man suddenly developed a transient loss of volitional movement of his left leg.
View Article and Find Full Text PDF[Acute disseminated encephalomyelitis following influenza vaccination: report of a case with callosal disconnection syndrome].
Rinsho Shinkeigaku
September 2014
Department of Neurology, Seirei Mikatahara General Hospital.
We present a case of callosal disconnection syndrome as a rare manifestation of acute disseminated encephalomyelitis (ADEM). A dextral 48-year-old Japanese woman received trivalent inactivated influenza vaccine in mid-November 2011. Twenty days later, she was found to be in a daze.
View Article and Find Full Text PDFPurpose: In this study, the authors assessed how the addition of intentional left-hand gestures to an intensive treatment for anomia affects 2 types of discourse: picture description and responses to open-ended questions.Method: Fourteen people with aphasia completed treatment for anomia comprising 30 treatment sessions over 3 weeks.Seven subjects also incorporated intentional left-hand gestures into each treatment trial.
View Article and Find Full Text PDFSelective visual neglect in right brain damaged patients with splenial interhemispheric disconnection.
Exp Brain Res
October 2010
Unità Cerebrolesioni Acquisite, Auxilium Vitae Volterra, Spa, Borgo San Lazzero 5, Volterra, Pisa, Italy.
Left unilateral neglect is frequently reported after right hemispheric lesions of the middle cerebral artery (MCA) damaging the parietal-frontal cortical-subcortical network subserving space representation and awareness. However, accumulating evidence shows that neglect can also follow lesions of the posterior cerebral artery (PCA) that do not directly affect this parietal-frontal network. Surgical studies in the monkeys have demonstrated that complete callosal resection combined with lesion of the right optic tract entirely deprives the right hemisphere of visual inputs from the left hemispace provoking severe left unilateral neglect.
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