[Glial origin of negative shifts in the surface potential of the brain upon tetanic stimulation: microelectrode study and mathematical analysis]. / Glial'noe proiskhozhdenie otritsatel'nykh sdvigov potentsiala poverkhnosti kory mozga pri ee tatanicheskom razdrazhenii: mikroélektrodnoe issledovanie i matematicheskii analiz.

It is shown in experiments on anesthetized cats that negative shift of the cortical surface potential evoked by its tetanic stimulation is similar in form and time course to the depolarization of glial cells. On the contrary, hyperpolarizing shifts of neuronal membrane potential are dissimilar in form and time course to the negative shift of the cortical surface potential. A conclusion is made that the contribution of neuronal hyperpolarization to the surface-negative shift of the potential can distinctly be seen only at the beginning of tetanization--in the first 200-300 ms; negative shift of the cortical surface potential is mainly produced by depolarization of glial cells.

[Glial origin of the slow negative potential of the direct cortical response: microelectrode study and mathematical analysis]. / Glial'noe proiskhozhdenie medlennogo otritsatel'nogo potentsiala priamogo otveta kory: mikroélektrodnoe issledovanie i matematicheskii analiz.

Slow negative potential of a direct cortical response is similar in configuration, time-course and reaction to repeated stimuli to depolarization of the cortical glial cells and differs from IPSP of the cortical neurons. According to data of digital spectral (frequency) analysis, slow negative potential is based on the glial component formed by summing up the constituents, which coincide with glial depolarization within a constant factor. The neuronal component, whose contribution is comparatively much smaller, is an indirect result of IPSP.