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Subsequently Dawson (1951, 1954) presented his averager to the Physiological Society, thereby initiating the present-day explosive growth of evoked potentials.<\/jats:p><jats:p>SEPs are made up of components with varying latencies. The components are best identified by latency and polarity as recorded at the scalp (P = positive and N = negative). Nevertheless, the nomenclature of somatosensory evoked potentials can be extremely confusing, mainly because the same component can have a different polarity depending on the electrode montage used. Generally speaking (but this is not a firm rule), far-field (subcortical) potentials are positive in polarity when a non-cephalic reference is used, whereas these same components have a negative polarity when the reference is on the scalp. It is therefore useful to always indicate the recording montage being employed. In addition, use of absolute latencies in the terminology can cause confusion because they are dependent upon length and body height. For example, the brachial plexus component usually occurs at about 9 msec, but may extend to as long as 11 or more msec in a very tall individual. Subsequent components then become difficult to identify in relation to normal means.<\/jats:p>","DOI":"10.1017\/s0317167100043717","type":"journal-article","created":{"date-parts":[[2016,7,28]],"date-time":"2016-07-28T07:34:31Z","timestamp":1469691271000},"page":"65-77","source":"Crossref","is-referenced-by-count":63,"title":["The Somatosensory Evoked Potential"],"prefix":"10.1017","volume":"9","author":[{"given":"Andrew","family":"Eisen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2015,9,18]]},"reference":[{"key":"S0317167100043717_ref112","first-page":"217","volume-title":"Neural Trauma","author":"Spielholz","year":"1979"},{"key":"S0317167100043717_ref67","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.32.1.85"},{"key":"S0317167100043717_ref31","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.10.4.141"},{"key":"S0317167100043717_ref32","first-page":"2","article-title":"A summation technique for detecting small signals in a large irregular background","volume":"115","author":"Dawson","year":"1951","journal-title":"Journal of Physiology"},{"key":"S0317167100043717_ref122","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.42.4.323"},{"key":"S0317167100043717_ref87","doi-asserted-by":"publisher","DOI":"10.1097\/00007632-198007000-00001"},{"key":"S0317167100043717_ref84","doi-asserted-by":"publisher","DOI":"10.1001\/archneur.1978.00500350010003"},{"key":"S0317167100043717_ref5","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.44.10.942"},{"key":"S0317167100043717_ref52","first-page":"92","author":"Eisen","year":"1981b"},{"key":"S0317167100043717_ref33","doi-asserted-by":"publisher","DOI":"10.1016\/0013-4694(54)90007-3"},{"key":"S0317167100043717_ref126","doi-asserted-by":"publisher","DOI":"10.1016\/0013-4694(81)90182-6"},{"key":"S0317167100043717_ref62","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.43.8.683"},{"key":"S0317167100043717_ref128","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.31.12.1524"},{"key":"S0317167100043717_ref127","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.28.3.218"},{"key":"S0317167100043717_ref123","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.31.7.866"},{"key":"S0317167100043717_ref121","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.39.9.890"},{"key":"S0317167100043717_ref119","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.44.3.243"},{"key":"S0317167100043717_ref72","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.4.5893.661"},{"key":"S0317167100043717_ref114","first-page":"761","article-title":"Detection and localization of occult lesions with brainstem auditory responses","volume":"52","author":"Stockard","year":"1977","journal-title":"Mayo Clinic Proceedings"},{"key":"S0317167100043717_ref81","doi-asserted-by":"publisher","DOI":"10.1016\/0013-4694(81)91427-9"},{"key":"S0317167100043717_ref88","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.44.8.718"},{"key":"S0317167100043717_ref47","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-011-6645-4_47"},{"key":"S0317167100043717_ref111","doi-asserted-by":"publisher","DOI":"10.1016\/0014-4886(81)90206-5"},{"key":"S0317167100043717_ref109","doi-asserted-by":"publisher","DOI":"10.1093\/brain\/101.3.447"},{"key":"S0317167100043717_ref68","first-page":"498","article-title":"Multimodality evoked potentials and CBF in patients with severe head injury","volume":"56","author":"Greenberg","year":"1977","journal-title":"Acta Neurologica Scandinavica"},{"key":"S0317167100043717_ref108","doi-asserted-by":"publisher","DOI":"10.1016\/0013-4694(81)90213-3"},{"key":"S0317167100043717_ref107","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-011-6645-4_46"},{"key":"S0317167100043717_ref57","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.42.3.238"},{"key":"S0317167100043717_ref106","doi-asserted-by":"publisher","DOI":"10.1093\/brain\/104.3.465"},{"key":"S0317167100043717_ref125","doi-asserted-by":"publisher","DOI":"10.1016\/0013-4694(73)90022-9"},{"key":"S0317167100043717_ref77","doi-asserted-by":"publisher","DOI":"10.1007\/BF00365598"},{"key":"S0317167100043717_ref102","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.29.9_Part_1.1236"},{"key":"S0317167100043717_ref101","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.30.11.1175"},{"key":"S0317167100043717_ref26","first-page":"370","article-title":"Conduction velocity in peripheral nerves and spinal afferent pathways in juvenile diabetics","volume":"30","author":"Cracco","year":"1980","journal-title":"Neurology"},{"key":"S0317167100043717_ref86","doi-asserted-by":"publisher","DOI":"10.3171\/jns.1968.28.3.0227"},{"key":"S0317167100043717_ref39","doi-asserted-by":"publisher","DOI":"10.1016\/0013-4694(80)90006-1"},{"key":"S0317167100043717_ref42","unstructured":"Desmedt J. 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