{"title":"P9 in median nerve SEPs is a junctional potential generated by the change of the volume conductor size between trunk and neck","authors":"Atsuko Mochizuki , Masahiro Sonoo , Teruo Shimizu , Makoto Iwata","doi":"10.1016/S0168-5597(98)00039-2","DOIUrl":null,"url":null,"abstract":"<div><p><strong>Objectives</strong>: We aimed to investigate the origin of P9 in median SEPs by applying the junctional potential theory.</p><p><strong>Methods</strong>: We studied the distribution over the body surface with contralateral shoulder reference in 4 normal subjects.</p><p><strong>Results</strong>: A stationary potential field P9/tN9 (=truncal N9) was recorded: P9 over head and neck (the smaller part), tN9 over trunk (the larger part), the boundary being located between trunk and neck. This polarity agreed with that expected from simulation studies.</p><p><strong>Conclusions</strong>: P9 is a junctional potential generated by the change of the volume conductor size between trunk and neck.</p></div>","PeriodicalId":100401,"journal":{"name":"Electroencephalography and Clinical Neurophysiology/Evoked Potentials Section","volume":"108 6","pages":"Pages 584-587"},"PeriodicalIF":0.0000,"publicationDate":"1998-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0168-5597(98)00039-2","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electroencephalography and Clinical Neurophysiology/Evoked Potentials Section","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0168559798000392","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
Objectives: We aimed to investigate the origin of P9 in median SEPs by applying the junctional potential theory.
Methods: We studied the distribution over the body surface with contralateral shoulder reference in 4 normal subjects.
Results: A stationary potential field P9/tN9 (=truncal N9) was recorded: P9 over head and neck (the smaller part), tN9 over trunk (the larger part), the boundary being located between trunk and neck. This polarity agreed with that expected from simulation studies.
Conclusions: P9 is a junctional potential generated by the change of the volume conductor size between trunk and neck.
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