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- W2017697448 abstract "Summary: Purpose: By means of the intraoperative electrophysiologic observation, we reevaluated the “transfer” theory that a transcallosal volley invoked by a cortical spike discharge in one hemisphere directly causes its contralateral counterpart via the corpus callosum (CC). Methods: Twenty‐six patients who underwent corpus callosotomy were the subjects of this study. Intraoperatively, electrocorticograms from both hemispheres were simultaneously monitored with callosal compound action potentials (CCAPs) from the CC. Analysis was conducted on (a) the interhemispheric delay of bilaterally synchronous spike‐and‐wave discharges (BSSWs), and (b) the chronological relation between BSSWs and CCAPs. Results: The side of prior spike discharges was never fixed but was occasionally reversed. Interhemispheric delays between the BSSWs were not constant, regardless of direction, and fluctuated in all patients. Most of the interhemispheric delays were distributed within 20 ms with a mode of 0 ms. The waveform of the CCAP was characterized by slow‐rising negative potential change that attained its peak after a cortical spike discharge. These findings were identical in all the patients regardless of whether the BSSWs were changed or unchanged after callosotomy. Conclusions: If the “transfer” role of the CC is true, interhemispheric delays between BSSWs must be longer than interhemispheric axonal conduction time (about 20 ms), and a preceding cortical spike discharge must produce a CCAP and then a contralateral one in order of time. However, this hypothesis was not confirmed in the present study. We propose the interhemispheric recruitment of the epileptogenic state as a different role of the CC on epileptogenesis." @default.
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- W2017697448 date "2002-12-01" @default.
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- W2017697448 title "Is a Cortical Spike Discharge “Transferred” to the Contralateral Cortex via the Corpus Callosum?: An Intraoperative Observation of Electrocorticogram and Callosal Compound Action Potentials" @default.
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- W2017697448 doi "https://doi.org/10.1046/j.1528-1157.2002.13402.x" @default.
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