Abstract
Since the work of Dawson1–3 somatosensory evoked potentials (SEPs) have become more or less a standardized procedure in the hands of neurophysiologists4. However, the configuration of the SEP as picked up from the scalp does not depend solely upon the known physiological parameters but is also influenced by psychophysiological factors5–12. Larson13 and Halliday14 were pioneers in reporting the changes in the cerebral evoked potentials associated with vascular lesions. Noel and Desmedt15 and Velasco16 have described the behaviour of SEP in the thalamic and brainstem lesions. In this study, SEPs of ten subjects who complained of hemianaesthesia and/or weakness of same side upper and lower extremites (hemiplegie syndrome) have been analysed. The abnormalities in terms of delayed latencies, attenuation of signals and/or desynchronization so far as early (up to 30 ms) and late (beyond 30 ms) waves have been noted. An attempt has been made to understand the pathophysiology lying behind these variants and also to correlate vascular lesions or other factors with them.
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References
Dawson, G. D. (1950). Cerebral responses to nerve stimulation in man. Br. Med. Bull, 6, 326
Dawson, G. D. (1954). A summation technique for the detection of small evoked potentials. Electroenceph. Clin. Neurophysiol, 6, 65
Dawson, G. D. (1956). The relative excitability and conduction velocity of sensory and motor nerve fibres in man. J. Physiol (Lond)., 131, 436
Desmedt, J. E. (1979). Somatosensory cerebral evoked potentials in man. In Handbook of Electroenceph. Clin. Neurophysiol, 9, 55
Davis, H. (1964). Enhancement of evoked cortical potentials in humans related to a task requiring a decision. Science, 145, 182
Debecker, J. and Desmedt, J. E. (1966). Rate of intermodality switching disclosed by sensory evoked potentials averaged during signal detection. Physiol (Lond)., 185, 52
Garcia-Austt, E. (1963). Influence of the state of awareness upon sensory evoked potentials. Electroenceph. Clin. Neurophysiol, (Suppl.) 24, 76
Haider, M. (1967). Vigilance, attention, expectation & cortical evoked potentials. Acta. Psychol (Amst.), 27, 245
MacKay, D. M. (1969). Evoked brain potentials as indicators of sensory information processing. Neuroscience Res. Prog. Bull, 7, 181
Satterfield, J. H. (1965). Evoked cortical response enhancement and attention in man. Electroenceph. Clin. Neurophysiol, 19, 470
Sutton, S: (1969). The specification of psychological variables in an average evoked potential experiment. In E. Douchin and D. B. Lindsley (eds.). Average Evoked Potentials- Methods, Results and Evaluation, pp. 237–297. (Washington, NASA Sp-191)
Walter, W. G., Cooper, R., Aldridge, V. J., McCallum, W. C. and Winter, A. L. (1964). Contingent negative variation an electric sign of sensorimotor association and expectancy in the human brain. Nature (Lond)., 203, 380
Larson, S. J., Sanca, Jr. and Baker J. B. (1966). Evoked cortical potentials in patients with stroke. Circulation, 33, (Suppl. 2), 15
Halliday, A. M. (1967). Changes in the form of cerebral evoked responses in man associated with various lesions of the nervous system. Electroenceph. Clin. Neurophysiol. (Suppl.) 25, 178
Noel, P. and Desmedt, J. E. (1975). Somatosensory evoked potentials after vascular lesions of the brain stem and diencephalon. Brain, 98, 113
Velasco, M., Velasco, F., Maldonado, H. and Machado, J. P. (1975). Differential effect of thalamic and sub-thalamic lesion on early and late components of the somatic evoked potentials in man. Electroenceph. Clin. Neurophysiol, 39, 163
Desmedt, J. E. and Manil, J. (1970). Somatosensory evoked potentials of the normal human, neonate in REM sleep, in slow wave sleep and in walking. Electroenceph. Clin. Neurophysiol, 29, 113
Nakanishi, L T. Shimada, Y. Sakuta, M. and Royokura, Y. (1977). Clinical and experimental studies of the initial positive potential of the somatosensory evoked response. In Ninth International Congress of EEG & Clin. Neurophysiology., 43, 450
Halliday, A. M. and Wakefield, G. S. (1963). Cerebral evoked potentials, in patients with dissociated sensory loss. J. Neurol Neurosurg. Psychiat., 26, 211
Marshall, J. (1968). The management of Cerebrovascular Disease., 20. (London: Churchill)
Giblin, D. R. (1964). Somatosensory evoked potentials in healthy subjects and in patients with lesions of the nervous system. Ann. NY Acad. Sci, 112, 93
Velasco, M., Velasco, F., Cepedo, C. and Munoz, H. (1977). Wakefulness-sleep modulation of cortical and thalamic somatic evoked potential components in man. InNinth International Congress of EEG & Clin. Neurophysiol, 43, 452
Marshall, J. (1968). The Management of Cerebrovascular Disease, p. 25. (London: Churchill)
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Shahani, M., Bharucha, E.P., Capadia, G.D. (1980). Comparative study of early and late somatosensory evoked potentials in patients with hemiplegia and/or hemianaesthesia. In: Barber, C. (eds) Evoked Potentials. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6645-4_54
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DOI: https://doi.org/10.1007/978-94-011-6645-4_54
Publisher Name: Springer, Dordrecht
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