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The effect of click rate on latency and interpeak interval of the brain-stem auditory evoked potentials in children from birth to 6 years
Institution:1. Rotman Research Institute, Baycrest Hospital, Toronto, ON, Canada M6A 2E1;2. Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada;3. Department of Psychology, University of Toronto, Toronto, ON, Canada;1. N.N. Petrov Institute of Oncology, St.-Petersburg, Pesochny, Leningradskaya 68, 197758, Russia;2. St.-Petersburg Pediatric Medical University, St.-Petersburg, Litovskaya 2, 194100, Russia;3. I.I. Mechnikov North-Western Medical University, St.-Petersburg, Kirochnaya street 41, 191015, Russia;4. St.-Petersburg State University, St.-Petersburg, Universitetskaya Naberezhnaya 7/9, 199034, Russia;1. Electrical Engineering Department, Faculty of Engineering, Assiut University, 71515 Assiut, Egypt;2. Control Systems Group, Department of Electrical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands;3. Information Engineering Department, University of Padova, Padova 35131, Italy;1. Department of Statistics, Virginia Tech, Blacksburg, VA, USA;2. Department of Behavioral Science, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA;3. Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany;4. Department of Biostatistics, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA
Abstract:Latency and interpeak interval of the brain-stem auditory evoked potentials at different click rates were measured in 80 healthy children from birth to 6 years, and 21 adults. Clicks were presented at 10, 30, 50, 70 and 90/sec, and 70, 40 and 20 db HL. At high stimulus intensity (70 dB SL), all latencies of waves I, III and V and the I–V, I–III and III–V intervals showed a progressive prolongation with increasing repetition rate. The latency- and the interval-rate functions were similar for all age groups but their slopes were slightly steeper in younger than in older. As click rate increased from 10/sec to 90/sec, the latencies of waves I, III and V at different age groups were prolonged by 4–10%, 9–13% and 12–15% respectively, and the intervals of I–V, I–III and III–V were prolonged by 15–16%, 8–16% and 14–24% respectively. The mean increments of wave V latency and I–V interval in different age groups were 0.404–0.575 and 0.332–0.526 msec respectively with increasing click rate from 10 to 50/sec, and 0.697–1.009 and 0.629–0.776 msec respectively with increasing click rate from 10 to 90/sec. The younger the age the larger the absolute increments for all these BAEP parameters, but the increasing rates for a BAEP measure were similar among different age groups, exhibiting no age-dependent differences. The III–V/I–III interval ration in most age groups was increased by 3–10% with increasing click rate from 10 to 90/sec, suggesting that the III–V interval was affected by stimulus rate slightly more than I–III interval.At moderate (40 dB HL) and low (20 dB SL) intensity, all waves and intervals showed similar latency- and interval-rate functions to those at high intensity. This demonstrates that the shifting latencies and interpeak intervals with increasing click rate appeared to be independent of the stimulus intensities.
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