[Spectrum of high-frequency oscillations of the electrocorticogram and their nature]. / Spektr vysokochastotnykh kolebanii élektrokortikogrammy i ikh priroda.

A gradual amplitude decrease towards higher frequencies was found in the spectrum (25-400 Hz) of the ECoG of the curarized rabbit. This gradual decrease of the amplitude continued to exist under the action of d-amphetamine, physostigmine, atropine, chlorpromazine and thiopental despite changes in the spectrum characteristic of every agent. These changes allowed finding the boundary near 40 Hz between high frequencies (HF) and conventional ECoG. The amplitudes of all HF components changed in the same direction independently of the ECoG. Unanimous changes suggest common genesis of HFs and a gradual decrease of the amplitude in the spectrum supports their synaptic but not spike origin. In the light of the concept of the EEG quantum the conventional ECoG represents synchronization and HFs express fluctuations of the quantum flow.