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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Varley, R. et al.

Varley, Cowell, Gibson, Romanowski,

Disconnection agraphia in a case of multiple sclerosis: the isolation of letter movement plans from language.

We report the case of a left-handed man ( MCR), who presented with a peripheral agraphia as an early sign of multiple sclerosis. His left-handed writing was neologistic, whilst oral spelling, typing and spelling with the right hand were intact. Structural MRI scanning revealed a lesion of the body of the corpus callosum. Dichotic listening tests indicated that MCR displayed left hemisphere dominance for language. It is proposed that MCR represents a case of a disconnection syndrome in which right hemisphere systems that provide the basis for movement templates during left-handed writing are isolated from left hemisphere language systems. Analysis of left-handed writing indicated that peripheral movement control was highly structured with both individual letter frequency and sequential dependencies between letters represented within these motor control units. This case represents an opportunity to explore the mechanisms of movement control for writing and to examine the characteristics of isolated letter templates.[1]

References

Disconnection agraphia in a case of multiple sclerosis: the isolation of letter movement plans from language. Varley, R., Cowell, P.E., Gibson, A., Romanowski, C.A. Neuropsychologia. (2005) [Pubmed]

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