Functional significance of high-frequency components of brain electrical activity in the processes of gestalt formation

A review. Current views of the so-called binding problem, which considers hypothetical mechanisms of perception of sensory stimuli and formation of their corresponding Gestalts (internal images) are discussed. The mechanism of intensification of synchronized reactions of cortical electrucal activity in the gamma band frequence (30-80 Hz) is the basis of the most popular point of view of "binding". The article considers the evidence for the funcrional significance of the high-frequency components exceeding the gamma-range (to 200 Hz) obtained by the author, the origin of these oscillations, and conditions of their focal derivation. The problem of "binding" and stages of instrumental conditioning (a stimulus, perception of the stimulus, and its transformation into a signal) as well as significance of the context in learning and formation of tonic states ensuring the realization of phasic reactions is discussed. Forms of "binding" at the final stage of conditioning (selective attention) are considered. The question is posed as to whether "binding"' is exhausted only by the mechanisms of synchonization of activities of large neuronal populations and only in the frequencies of the gamma range.