The contribution of gamma and beta-rhythms in working (WM), dynamics of retaining traces of memory on a delay interval and definition of brain structures involved in processes of (WM) was studied by the new method of the micro structural analysis for event=related oscillatory brain activity. Research is carried out on 8 subjects who has to retain four different double-digit in five seconds delay for the subsequent comparison with target and no=target stimuli and the performing of motor reaction. Retaining traces of memory has intermittent character and on a delay interval is presented by periodic flashes in activity of frequency=selective gamma and beta generators in prefrontal, associative, visual cortex and cerebellum with the leading role of prefrontal cortex. Joint activity of local brain structures is provided with the frequency-selective generators working both on different frequencies, and on the common frequency.

The article is devoted brain activity and its investigation in the psychophysiological school by E.N. Sokolov. The role of novelty neurons in hippocampus and nonspecific neurons of thalamus in an origin of cortical activation processes is shown. Resonance properties of EEG and evoked potentials components in human and animals are revealed. Representation about EEG as a total activity of set of local wave generators is formulated. The new EEG-parameter as activated frequency-selective gamma- and the bеtа-generators displaying activity of pacemaker neurons in local neuron networks, confirming the concept of vector coding the information is allocated.