ERP as the Vector Difference of Frequency-Selective Gamma OscillationsстатьяТезисы
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 6 февраля 2017 г.
Аннотация:Background: Brightness perception has been extensively studied in E.N. Sokolov’s ‘Vector Psychophysiology’ Russian school of thoughts via registration of evoked potentials to abrupt change of brightness stimuli but involving of gamma oscillations in this process has never been investigated. The present study focuses on the contribution of gamma oscillations in the perception of change of brightness stimuli from the position of pacemaker hypothesis of the origin of gamma rhythm. Methods: Five homogeneous red stimuli were successively presented on CRT-screen to 11 subjects with normal vision. Brightness of stimuli was logarithmically distributed from minimum to maximum of CRT brightness. 16-channel EEG was used and visual evoked potentials (VEPs) to abrupt changes of every possible combination of stimuli were recorded resulted in 5 × (5-1) matrix. The authors suggest a special method based on the narrow frequency filtering of these VEPs and localization of dipole sources of gamma oscillations over the structural MRI slices for analyzing of this matrix. We filtered every group-averaged VEP in range from 30 to 75 Hz with step of 1 Hz (30-31, 31-32 … 74-75 Hz) and calculated the number of equivalent electrical dipoles in these narrow ranges of VEP using BrainLock 6.0 localizing software. The number of such dipoles was summarized for whole 30-75 Hz range inside 50-100 ms and 100-150 ms latencies and amplitudes of corresponding N87 and P120 occipital-dominated components were also calculated. Results and Discussion: We have shown that total number of frequency-selective 30-75 Hz gamma oscillators significantly correlates with amplitudes of N87 and P120 components in the occipital leads (r=0.72, p<0.01 and r=0.58, p<0.01, respectively). Computation of equivalent dipoles for the discrete gamma frequencies and its projection on MRI slices demonstrates predominant involving of occipital and temporal cortex in process of perceiving of brightness change. These results are compatible with the pacemaker hypothesis and corresponding to E.N. Sokolov (2013) ‘Vector Psychophysiology’ theory of neuronal detectors of difference between stimuli which can be widespread across occipital-temporal areas. As result, we proved that these neuronal detectors of difference between brightness stimuli can be gamma-range occipital and temporal pacemakers. Conclusion: It’s possible to propose new original model of neuronal net calculating vector differences between two successive brightness stimuli (in conceptual frame of E.N. Sokolov ideas). The research was supported by the Russian Science Foundation (project № 16-18-00066).