Electrogenesis of Evoked Potentials

  • R. Galambos
Part of the Springer Series in Brain Dynamics book series (SSBD, volume 2)


At the first of the Berlin Conferences 2 years ago I pointed out how little we understand about the anatomical and physiological bases of evoked potentials (EPs). What I had in mind is illustrated in Fig. 1, a 15-min experiment during which EPs were recorded through implanted brain electrodes from a rhesus monkey (Galambos 1961 a; see also Galambos and Sheatz 1962). The experimenters outside the experimental room watched the monkey through a window. The time was BC (Before Computers), so you see here 18 2-s segments of EEG tracings recorded through four bipolar electrodes (located, from above downward, in caudate nucleus, thalamic intralaminar nucleus, midbrain reticular formation, and medial geniculate body). In each segment the pip in the center of the bottom line shows when a fairly loud click was emitted (once every 10 s) through a loudspeaker above the animal’s head; lined up above these pips one sees the brain potentials the stimuli evoked.


Glial Cell Evoke Potential Medial Geniculate Body Muller Cell Brain Astrocyte 
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© Springer-Verlag Berlin Heidelberg 1989

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  • R. Galambos

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