An experimental model of working memory was used to study the time characteristics and topography of evoked electrical brain activity in early discrimination between two sequential orientations. Studies in 33 subjects analyzed the amplitudes of components P100 and N150 of sensory event-related potentials (ERP) in the occipital, parietal, and temporal areas of the cortex on solution of a task consisting of comparing two sequentially presented visual stimuli. Stimuli in experimental sessions were square grids with lines in different orientations; stimuli in control sessions were spatial patterns consisting of three circles with different positions on the screen. The neurophysiological correlate of the detection of discordance between the current orientation and the orientation held in memory was an increase in the amplitude of the early wave complex P100/N150 in the occipital cortex, which was combined with a less clear increase in the P100 in the temporal-parietal area. Discordance of patterns was accompanied by an increase in the amplitude of the later ERP component N150 in the visual areas, without clear zonal specificity in this effect. Thus, these studies demonstrated the specific involvement of the early visual cortex in the processing information on comparison of the current sensory visual sign – line orientation – with that stored in memory. The discordance signal, formed in the occipital area, may underlie the early detection of changes in basic visual characteristics.
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Translated from Zhurnal Vysshei Nervnoi Deyatel’nosti imeni I. P. Pavlova, Vol. 69, No. 5, pp. 577–589, September–October, 2019.
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Mikhailova, E.S., Gerasimenko, N.Y. & Slavutskaya, A.V. Sensory Mechanisms in Early Orientation Discrimination in a Model of Visual Working Memory. Neurosci Behav Physi 50, 700–709 (2020). https://doi.org/10.1007/s11055-020-00958-3
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DOI: https://doi.org/10.1007/s11055-020-00958-3