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.
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