オザキ　イサム   Ozaki Isamu   尾﨑　勇    所属   東邦大学  医学部 医学科    職種   研究員（寄付講座）
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	RIGHT OR LEFT EAR REFERENCE CHANGES THE VOLTAGE OF FRONTAL AND PARIETAL SOMATOSENSORY EVOKED-POTENTIALS
掲載誌名	正式名：ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY ISSNコード：0013-4694
出版社	ELSEVIER SCI IRELAND LTD
巻・号・頁	80(6),pp.504-512
著者・共著者	C TOMBERG,JE DESMEDT,OZAKI, I
発行年月	1991/11
概要	Short-latency cortical somatosensory evoked potentials (SEPs) to left median nerve stimulation were recorded with either the left or right earlobe as reference. With a right earlobe reference the voltage of the parietal N20 and P27 was reduced while the voltage of the frontal P20 and N30 was enhanced. The effects were consistent, but their size varied with the SEP component considered and also among the subjects. Analysis of SEPs at different scalp sites and at either earlobe suggested that the ear contralateral to the side stimulated picked up transient potential differences, depending a.o. on side asymmetry and geometry of the neural generators as disclosed in topographic mapping. For example, the right ear potential can be shifted negatively by the right N20 field evoked by left median nerve stimulation. The changes involve the absolute potential values, but not the time features or the gradients of potential fields. Scalp current density (SCD) maps are not affected. The results are pertinent for current discussions about which reference to use and document the practical recommendation of recording short-latency cortical SEPs with a reference at the ear ipsilateral (not contralateral) to the side of stimulation.
PMID	1720726