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Harikanth 1, Sanjeev Kumar2, Amod Kumar2, Sneh Anand3
1Vellore Institute of Technology, VelloreE mail: [email protected]
2Central Scientific Instruments OrganisationSector 30 C, Chandigarh
3CBME, IIT Delhi, New Delhi
National Conference on Emerging Medical Instrumentation, 2010
OVERVIEW
Introduction Design of electrical stimulator Recording procedure Results Future scope Conclusion References
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INTRODUCTION Electroencephalography Evoked Potentials
Auditory Visual Somatosensory
Types of stimulations
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Electrical
Electrical
Cold Pressure
Cold Pressure
Mechanical
Mechanical
Chemical
Chemical
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Types of Stimulations
ThermalThermal
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Electrical Stimulator
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Controlling factors Pulse widthBurst Rate of pulse
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RECORDING PROCEDURE
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CONTD…
EEG cap was connected
Disposable electrodes were connected on the wrist region for applying electrical stimulation
EEG Data was recorded using Labchart software
Stimulations were applied at different time durations
Variations of frequency and amplitude in EEG signals were observed
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RESULTS
Frequency of Beta wave was found to be increased during stimulation
Amplitude of Theta wave was found to be reduced after applying stimulation
During continuous electrical stimulation, the complexity of the signal was found to be increased
Frequency and amplitude were varying randomly during the stimulation.
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Normal Continuous Stimulation
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EEG responses for every 3sec stimulations at P3, C3, P4 and C4 locations
FUTURE SCOPE
Can be used for the study of Hypnosis effects for balanced anesthesia monitoring
Painful stimulations can be applied for further research by increasing the power of output current
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CONCLUSION
Electrical stimulator was designed
EEG signals were observed at different rates of stimulations
Significant variations in Beta and theta waves were observed at every recorded location
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REFERENCES Karbowski K. Hans Berger (1873-1941), J. Neurol., Vol 249 (8), 2002, pp 1130-1131.Gloor P. Hans Berger and the discovery of the electroencephalogram,
Electroencephalography and clinical neurophysiology, Vol 28, 1969, pp 1-36.Khandpur. Hand book of biomedical instrumentation, 2nd Edition, Tata McGraw Hill, New
Delhi.Towle VL, Bolaños J, Suarez D, Tan K, Grzeszczuk R, Levin DN, Cakmur R, Frank SA, Spire
JP. The spatial location of EEG electrodes: locating the best-fitting sphere relative to cortical anatomy, Electroencephalogr Clin Neurophysiol., Vol 86 (1), 1993, pp 1-6.
Regan D. Electrical responses evoked from the human brain, Scientific American, Vol 241, 1979, pp 134-46.
Addy R.O, Dinner D.S, Luders H, Lesser R.P, Morris H.H, Wyllie E. The effects of sleep on median nerve short latency somatosensory evoked potentials, Electroencephalogr. Clin. Neurophysiol, Vol 74, 1989, pp 105-111.
Burak, Guc lu. Low-cost computer-controlled current stimulator for the student laboratory. Adv Physiol. Educ., Vol. 31, 2007, pp. 223-231.
Xiaohong Wang, Koji Inui, Yunhai Qiu, Minoru Hoshiyama, Tuan Diep Tran Ryusuke, Kakigi. Effects of sleep on pain-related somatosensory evoked potentials in humans, Neuroscience Research, Vol. 45, 2003, pp 53-57.
http://www.beteredingen.nl/downloads/eeg_electrodes_10-20.pdfhttp://en.wikipedia.org/wiki/Electroencephalographyhttp://en.wikipedia.org/wiki/Evoked_potential
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