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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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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