| Abstract: | The nature of the principal components of the evoked potential of the general cortex of the turtle forebrain was studied in response to electrical stimulation of the contralateral optic nerve. Comparison of these components with postsynaptic potentials of the neurons of this structure showed that the four fast negative waves of the evoked potential correspond to fast EPSPs, which are independent of one another. The positive wave of the evoked potential is the sum of several IPSPs. The slow negative and, to some extent, the positive wave are a reflection of the slow EPSP. It is shown that early EPSPs are generated on portions of the apical dendrites which are further from the soma than those generating late fast EPSPs and also the IPSP and slow EPSP. Axo-somatic contacts are perhaps also concerned in the generation of the last-named potential.M. V. Lomonosov Moscow State University. Translated from Neirofiziologiya, Vol. 5, No.3, pp.261–271, May–June, 1973. |
