Effect of sleep stage on somatosensory evoked potentials by median nerve stimulation |
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| Institution: | 1. Department of Neurology, Columbia University Medical Center, New York, NY, United States;2. Department of Psychology, University of Colorado Denver, Denver, CO, United States;3. Center for Behavioral Cardiovascular Health, Columbia University, New York, NY, United States;4. Department of Psychiatry, New York University Medical Center, New York, NY, United States;1. Saul B. Korey Department of Neurology, Albert Einstein College of Medicine, Yeshiva University, Bronx, NY 10461, USA;2. Department of Neurology, Montefiore Medical Center, Bronx, NY 10467, USA;3. The Gruss Magnetic Resonance Research Center and Department of Radiology, Albert Einstein College of Medicine of Yeshiva University, Bronx, NY 10461, USA;4. The Department of Radiology, Montefiore Medical Center, Bronx, NY 10467, USA;5. Department of Neurology, Albert Einstein College of Medicine and Montefiore medical center, Bronx, NY 10461 USA |
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| Abstract: | The effects of sleep stage on early cortical somatosensory evoked potentials (SEPs) and short-latency components elicited by median nerve stimulation were studied in 12 normal volunteers. The latency of P13 in the awake stage was not significantly different from that in any sleep stage. The latencies of N16, N20 and P20 were significantly prolonged while the amplitude of N20 was decreased during the non-rapid eye movement (NREM) sleep stage. P22, P23 and N24 components showed double peaks (P23a, P23b, N24a, N24b) during the NREM sleep stage in 6 subjects, while N24 showed a single peak and only P22 and P23 showed double peaks in 5 other subjects. The latencies and morphologies of SEPs during rapid eye movement sleep stage were almost the same as those during the awake stage. These findings suggest that NREM sleep affects the latency, amplitude and morphology of N16 and early cortical components. |
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