Evaluation of reference sites for scalp potentials evoked by painful and non-painful sural nerve stimulation |
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| Affiliation: | 1. School of Anthropology & Department of Geosciences, University of Arizona, Tucson, AZ, USA;2. Department of Physics, Laboratory of Space Sciences, and Institute for Materials Science & Engineering, Washington University in St. Louis, St. Louis, MO, USA;3. Department of Geography, University of Oregon, Eugene, OR, USA;4. Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, USA;5. Department of Anthropology, Southern Methodist University, Dallas, TX, USA;6. Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK;7. Department of Lithospheric Research, University of Vienna, A-1090, Vienna, Austria;8. School of Forestry and Environmental Studies, Yale University, New Haven, CT 06511, USA;9. Scripps Institution of Oceanography, UC San Diego, La Jolla, CA, USA;10. Department of Earth & Planetary Sciences, Harvard University, Cambridge, MA, USA;11. Analytical, Environmental, and Geochemistry, Vrije Universiteit Brussel, Pleinlaan 2, Brussels, Belgium |
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| Abstract: | The objective of this study was to evaluate reference sites for recording the middle- and long-latency scalp potentials elicited by painful and non-painful sural nerve stimulation. Somatosensory evoked potentials (SEPs) were recorded from the scalp, the mastoid, the earlobe, the neck, and the wrist. Each site was referenced to the sterno-vertebral (SV) electrode, which is a balanced non-cephalic reference with essentially no ECG contamination.There was little or no activity recorded between the wrist and SV, and the SV was located within a region extending from the rostral neck to the wrist where the potentials were stable over space. Hence, the SV reference is indifferent for the middle- and long-latency potentials evoked by painful and non-painful sural nerve stimulation. There was, however, significant activity recorded from the earlobe and mastoid, sites which are frequently used as references for the SEP. It is important that investigators using these cephalic references to study the middle- and long-latency peaks of the SEP be aware of this activity as it will distort SEPs recorded from single sites and the SEP scalp topography, distortions which could unnecessarily complicate their interpretation. |
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