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Callosal 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 PDFPerforming a reaching task with one arm while adapting to a visuomotor rotation with the other can lead to complete transfer of motor learning across the arms.
J Neurophysiol
April 2015
Department of Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin.
The extent to which motor learning is generalized across the limbs is typically very limited. Here, we investigated how two motor learning hypotheses could be used to enhance the extent of interlimb transfer. According to one hypothesis, we predicted that reinforcement of successful actions by providing binary error feedback regarding task success or failure, in addition to terminal error feedback, during initial training would increase the extent of interlimb transfer following visuomotor adaptation (experiment 1).
View Article and Find Full Text PDFAsymmetric visual prism adaptation and intermanual transfer.
J Mot Behav
January 2009
Department of Psychology, Illinois State University, Normal, IL 61790-4620, USA.
The authors hypothesized that failure of visual adaptation to transfer from an individual's exposed right hand to the unexposed left hand arises from hemispheric asymmetry in eye-hand coordination, such that the dominant eye-right-hand system is specialized for action in the right body space. Groups received combinations of exposed dominant or nondominant hands and right or left prismatic displacement. Following prism exposure (terminal feedback), the authors measured aftereffects for proprioceptive straight-ahead and straight-ahead target pointing for both hands.
View Article and Find Full Text PDFInterhemispheric transfer of information and schizophrenia.
Eur Arch Psychiatry Neurol Sci
July 1990
Psychology Department, Institute of Psychiatry, University of London, England.
The interhemispheric transfer of stereognostic information was investigated in four groups of subjects: paranoid schizophrenics, non-paranoid schizophrenics, non-schizophrenic psychiatric patients, and normals. Previous work has raised the possibility that schizophrenia is characterised by a dysfunction of the corpus callosum, but there are several methodological problems associated with this research. A comparison of inter-manual and same-hand conditions on the experimental task revealed no evidence for impaired transfer of information in the schizophrenic groups.
View Article and Find Full Text PDFCallosal syndrome: implications for understanding the neuropsychology of stroke.
Arch Phys Med Rehabil
October 1984
A case is presented of callosal syndrome following cerebral hemorrhage and amphetamine abuse in a 26-year-old right-handed man. There were few hemispheric findings but a full callosal syndrome including left apraxia to verbal commands, left tactile anomia, left agraphia, right constructional apraxia, failure of blindfolded side-to-side hand replication and form-board testing showing loss of interhemispheric transmission including intermanual interference. The "draw-a-clock" test showed left inattention when drawn with the right hand but not the left, and perseveration was noted for spatial tasks done with the right hand and symbolic tasks done with the left.
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