Sensory and cognitive components of the CO2 laser evoked cerebral potential |
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| Institution: | 1. Westfälische Wilhelms-Universität Münster, Institut für Anorganische und Analytische Chemie, Corrensstraße 30, 48149 Münster, Germany;2. Helmholtz Zentrum München, Institut für Pathologie — Abteilung Analytische Pathologie, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany;3. Technische Universität München, Institut für Allgemeine Pathologie und Pathologische Anatomie, Trogerstraße 18, 81675 München, Germany;4. Universitätsklinikum Freiburg, Institut für Klinische Pathologie, Breisacher Straße 115a, 79106 Freiburg, Germany;5. European Virtual Institute for Speciation Analysis (EVISA), Mendelstraße 11, 48149 Münster, Germany;1. Department of Civil and Environmental Engineering, Michigan Technological University, 1400 Townsend Dr, Houghton, MI 49931, USA;2. School of Forest Resources and Environmental Science, Michigan Technological University, 1400 Townsend Dr, Houghton, MI 49931, USA;3. Atmospheric Sciences Program, Michigan Technological University, 1400 Townsend Dr, Houghton, MI 49931, USA;1. Department of Environmental Engineering, Faculty of Engineering, Dokuz Eylul University, Tinaztepe Campus, 35160 Buca, Izmir, Turkey;2. Turkish State Meteorological Service, Izmir Regional Directorate, Izmir, Turkey;1. College of Science and Engineering, Flinders University, Adelaide, Australia;2. Medical Device Research Institute, Flinders University, Adelaide, Australia;3. Department of Neurology, Flinders Medical Centre, Adelaide, Australia;4. Centre for Neuroscience, College of Medicine and Public Health, Flinders University, Adelaide, Australia;1. Inail – Research, Certification and Control Division, Via di Fontana Candida 1, 00040 Monteporzio Catone (Rome), Italy;2. Department of Chemistry University of Rome “Sapienza”, Piazzale Aldo Moro5, 00185 Rome, Italy |
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| Abstract: | We recorded CO2 laser evoked cerebral potentials in 6 healthy subjects using both a standard technique and an oddball paradigm. In the standard technique stimuli were aimed at the dorsum of the left hand with the subject passive; in the oddball paradigm, target infrequent stimuli (P = 0.15) were directed to one side of the dorsum of the left hand and the subject was instructed to count their occurrence, the frequent stimulus being delivered to the other side of the hand. In both standard and oddball frequent recordings, CO2 laser evoked potentials were a well-formed negative-positive complex with a peak latency and amplitude around 305 msec (to positivity) and 32 μV respectively. However, in the oddball target task a later potential was also recorded, with a mean latency and amplitude of 621 msec and 24 μV respectively which we believe to be a laser oddball potential. These results demonstrate that the CO2 potential is not altered by manipulations of attention to any significant extent and suggests that it is therefore closely related to the primary sensory input. They also provide further evidence of the non-specificity of the oddball potential across sensory modalities. |
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