Interactions of somatosensory evoked potentials: simultaneous stimulation of two nerves |
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| Affiliation: | 1. Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio, USA;2. Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Advanced Platform Technology Center of Excellence, Cleveland, Ohio, USA;3. Louis Stokes Cleveland Department of Veterans Affairs Medical Center, Functional Electrical Stimulation Center of Excellence, Cleveland, Ohio, USA;4. Department of Engineering, Hope College, Holland, Michigan, USA;1. Experimental and Clinical Pharmacopsychology, Psychiatric Hospital, University of Zurich, Switzerland;2. Neuroscience Center Zurich, University and ETH Zurich, Zurich, Switzerland;3. Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, USA;4. Department for Neurodegenerative Diseases and GeriatricPsychiatry, University Hospital Bonn, Bonn, Germany;5. Department of Psychology, Gallos University campus, University of Crete, Rethymno, Greece;6. Department of Psychiatry and Behavioral Sciences, Faculty of Medicine, Voutes University campus, University of Crete, Heraklion, Greece;7. Department of Psychology, Institute of Psychiatry, King''s College London, United Kingdom;8. Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, USA;9. Mental Illness Research, Education, and Clinical Center (VISN 2), James J. Peters VA Medical Center, New York, USA;1. Department of Radiation Oncology, UPMC Hillman Cancer Center, Pittsburgh, PA, USA;2. Department of Gynecologic Oncology, UPMC Hillman Cancer Center, Pittsburgh, PA, USA |
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| Abstract: | To analyse the mechanism by which sensory inputs are integrated, interactions of somatosensory evoked potentials (SEPs) in response to simultaneous stimulation of two nerves were examined in 12 healthy subjects. Right, left and bilateral median nerves were stimulated in random order so that a precise comparison could be made among the SEPs. The arithmetical sum of the independent right and left median nerve SEPs was almost equal within 40 msec of stimulus onset to that evoked by the simultaneous stimulation of bilateral median nerves. However, a difference emerged after 40 msec. The greatest difference was recorded after 100 msec. Sensory information from right and left median nerves may interact in the late phase of sensory processing. Left median, left ulnar, and both nerves together were stimulated. The sum of the SEPs of left median and ulnar nerves was not equal to that evoked by the simultaneous stimulation of the two nerves even at early latencies. Differences between them were first recorded at 14–18 msec and became greater after 30–40 msec. It is suggested that the neural interactions between impulses in the median and ulnar nerves begin below the thalamic level. |
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