Российская академия наук


COHERENT EEG ANALYSIS IN THE PERCEPTION OF IMAGE FLATNESS OF BOTH BULK



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COHERENT EEG ANALYSIS IN THE PERCEPTION OF IMAGE FLATNESS OF BOTH BULK

Zwezdochkina N.W., Antipov W.N., Ahmadullina G.N.

Kazan (Volga) Federal University, Kazan, Russia; nataly_ksu@mail.ru


The coherence of the electrical signals of the brain - the quantitative indicator of synchronicity involving different cortical areas of their interaction. High coherence means that the two points recording electrical potentials has the same position on the frequency and the ratio of the phase constant activity (Alfimova M.V. et al, 2010). The purpose of this study was to investigate EEG coherence in the perception of 3D-planar image. Analysis of EEG coherence carried by the diagnostic system "Neuron-Spectrum-1." EEG registration is carried out in a monopolar bandwidth from 0.5 to 35 Hz with a time constant of 0.3 s: anterior frontal (Fp1, Fp2), central (C3, C4), temporal (T3 , T4), occipital (O1, O2) in the three right-handed subjects, aged 21, with their consent. As a common reference electrode used ear electrodes. Coherence (squared modulus of the coherence functiontion) was calculated for the physiological frequency bands: delta (0.5-4.0 Hz), theta (4.0-7.0 Hz), alpha (7,0-13,0 Hz) , beta1 (13,0-20,0 Hz), beta 2 (20,0-32,0 Hz). Tested the interhemispheric and intrahemispheric coherencesion in pairs leads: occipital, central, frontal, temporal, frontal / central, frontal / temporal, temporal / occipital, central / occipital 5 epochs (2.5 s each). Comparison of the complex parameters of EEG coherence was conducted in four experimental conditions: 1) in the state of quiet wakefulness (eyes closed), 2) at a fixed gaze on a white screen, and 3) when looking at the planar image 4) and the same image with 3D-perception.

High coherence occurred for all of the EEG rhythms in a state of quiet wakefulness with eyes closed, fixed gaze on a white sheet and a planar image. During of perception of 3D-planar images in all cases found a significant (almost half) of the total amplitude asynchronous increase coherence in all frequency bands as intra-and inter-hemispheric connections. It is known that the magnitude of the coherence quantitatively reflects the degree of functional connectivity of forming electrical processes in the brain, that is, can indirectly judge the level of intracerebral integration. Probably, when the three-dimensional perception of 2D-images of the observed increase in the integrative activity of the brain structures.



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