Abstract
Dawson’s averager, demonstrated first to the Physiological Society in 1951 began a new era in clinical neuroPhysiology. Figure 1, taken from Dawson1 illustrates a cortical somatosensory evoked potential (SEP) in response to repetitive electrical stimulation of the contralateral ulnar nerve at the wrist; all the features we now recognise as making up the early part of the normal cortical SEP can be seen. That this new technique could demonstrate changes in evoked potentials which correlated with clinical findings was soon apparent. Figure 2, a record taken in the EEG Department at the National Hospital around 1958, shows depression of the SEP over the left parietal region after left carotid thrombosis.
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References
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Small, D.G. (1980). Somatosensory and spinal evoked potentials. In: Barber, C. (eds) Evoked Potentials. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6645-4_5
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DOI: https://doi.org/10.1007/978-94-011-6645-4_5
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