Abstract
Evoked potential data to hemiretinal checkerboard stimulation were recorded simultaneously in 47 channels from normal volunteers, and were used for the construction of scalp field distribution maps. Maximal electrical power of the evoked scalp fields defined response latency. Upper hemiretinal stimuli yielded shorter latencies than lower hemiretinal stimuli, and the presentation mode of the checkerboard pattern showed systematically increasing latencies from “on” to “reversal” to “off”. Scalp locations of the responses also differed significantly between the modes of presentation.
The responses evoked by lateralized reversal stimuli were located over the hemisphere contralateral to the hemiretina stimulated for large targets, but tended towards the ipsilateral hemisphere for small targets.
We note that for practical clinical applications, not only the variance of latency and location across subjects, but also the effect of retinal location and presentation mode of the stimulus are crucial.
Supported in part by Swiss National Science Foundation, EMDO, and Hartmann-Müller-Foundation.
Supported by Roche Study Foundation, Basel.
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References
Biersdorf, W. R. & Z. Nakamura. Electroencephalogram potentials evoked by hemiretinal stimulation. Experientia 27, 402–403 (1971).
Blumhardt, L. D., Barrett, G., Halliday, A. M. & A. Kriss. The effect of experimental “scotomata” on the ipsilateral and contralateral responses to pattern-reversal in one half-field. Electroenceph. clin. Neurophysiol. 45, 376–392 (1978).
Cobb, W. A. & H. B. Morton. Evoked potentials from the human scalp to visual half-field stimulation. J. Physiol. 208, 39–40 (1970).
Lehmann, D., Kavanagh, R. N., & D. H. Fender. Field studies of averaged visually evoked EEG potentials in a patient with a split chiasm. Electroenceph. clin. Neurophysiol. 26, 193–199 (1969).
Lehmann, D., Meles, H. P., & Z. Mir. Scalp field maps of averaged EEG potentials evoked by checkerboard inversion. Biomed. Technik (Stuttgart) 21, Suppl., 117–118 (1976).
Lehmann, D. & Z. Mir. Methodik und Auswertung visuell evozierter EEG-Potentiale bei Verdacht auf Multiple Sklerose. J. Neurol. 213, 97–103 (1976).
Lehmann, D. The EEG as scalp field distribution, p. 365–384 in: A. Rémond (ed.): EEG Informatics. Elsevier, Amsterdam (1977).
Lehmann, D., & W. Skrandies. Multichannel evoked potential fields show different properties of human upper and lower hemiretina systems. Exp. Brain Res. 35, 151–159 (1979).
Shagass, Ch., Amadeo, M. & A. Roemer. Spatial distribution of potentials evoked by half-field pattern-reversal and pattern-onset stimuli. Electroenceph. clin. Neurophysiol. 41, 609–622 (1976).
Spekreijse, H., Estevez, O. & D. Reits. Visual evoked potentials and the physiological analysis of visual processes in man. pp. 16–89 in: J. E. Desmedt (ed.): Visual Evoked Potentials in Man. Clarendon, Oxford 1977.
White, C. T. & R. W. Hintze. Color evoked potentials: Cortical and subcortical elements, pp. 431–442 in: D. Lehmann and E. Callaway (eds.): Human Evoked Potentials/Applications and Problems. Plenum, London, 1979.
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Lehmann, D., Skrandies, W. (1980). Visually Evoked Scalp Potential Fields in Hemiretinal Stimulation. In: Schmöger, E., Kelsey, J.H. (eds) Visual Electrodiagnosis in Systemic Diseases. Documenta Ophthalmologica Proceeding Series, vol 23. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9180-4_35
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DOI: https://doi.org/10.1007/978-94-009-9180-4_35
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