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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Impacts of selected stimulation patterns on the perception threshold in electrocutaneous stimulation | Geng et al. Journal of NeuroEngineering and Rehabilitation 2011 8 9 http www.jneuroengrehab.eom content 8 1 9 Hill JOURNAL OF NEUROENGINEERING NCR AND REHABILITATION RESEARCH Open Access Impacts of selected stimulation patterns on the perception threshold in electrocutaneous stimulation Bo Geng1 Ken Yoshida1 2 Winnie Jensen1 Abstract Background Consistency is one of the most important concerns to convey stable artificially induced sensory feedback. However the constancy of perceived sensations cannot be guaranteed as the artificially evoked sensation is a function of the interaction of stimulation parameters. The hypothesis of this study is that the selected stimulation parameters in multi-electrode cutaneous stimulation have significant impacts on the perception threshold. Methods The investigated parameters included the stimulated location the number of active electrodes the number of pulses and the interleaved time between a pair of electrodes. Biphasic rectangular pulses were applied via five surface electrodes placed on the forearm of 12 healthy subjects. Results Our main findings were 1 the perception thresholds at the five stimulated locations were significantly different p 0.0001 2 dual-channel simultaneous stimulation lowered the perception thresholds and led to smaller variance in perception thresholds compared to single-channel stimulation 3 the perception threshold was inversely related to the number of pulses and 4 the perception threshold increased with increasing interleaved time when the interleaved time between two electrodes was below 500 ps. Conclusions To maintain a consistent perception threshold our findings indicate that dual-channel simultaneous stimulation with at least five pulses should be used and that the interleaved time between two electrodes should be longer than 500 ps. We believe that these findings have implications for design of reliable sensory feedback codes. Background Human beings sense the external environment by .
