Study of interhemispheric interaction by the indices of event-related potentials

G. Antsukh, T. Kutsenko, D. Nasiedkin, A. Pohrebna
Taras Shevchenko National University of Kyiv, Kyiv; Taras Shevchenko National University of Kyiv, Kyiv; Taras Shevchenko National University of Kyiv, Kyiv; Taras Shevchenko National University of Kyiv, Kyiv

Abstract


The study used a combined Stroop test involving a spatial feature. Stimuli (the words "green", "red", "blue" and "yellow", written in relevant or irrelevant color) were presented to the right or left of the center of the screen. In the case of coincidence of the color of the word and its semantic meaning, it was necessary to press the button with the ipsilateral hand (answer "yes", congruent stimulus), discrepancies – with the contralateral hand (answer "no", incongruent stimulus). According to the results obtained earlier, it was suggested that it is easier to transfer information from the left hemisphere to the right than in the opposite direction, and the dominance of the left hemisphere when performing this type of cognitive task. To study this hypothesis, records of event-related potentials (ERP) were obtained when subjects performed this test. The subjects were 7 men, right-handed, aged 20 ± 1,13 years. The most informative was the registration from Cz, for which the components N450 and late positive complex (LPC) were obtained when stimulated by
incongruent stimuli from the right side. The N450 component is associated with anterior cingulate cortex activity and is considered a reliable marker of conflict present in the experimental paradigm of this test. LPC is probably a component specific to the Stroop task and corresponds to the level of conflict of stimuli. Recording ERPs from the central lead does not allow to determine in this case the source of their origin. However, a comparison of ERP of incongruent stimuli from the right and left indicates differences in response to stimuli from different halves of the screen. The appearance of these components for incongruent stimuli exposed on the right side of the screen probably means their association with the functions of the left hemisphere, and confirms the previous hypothesis of metacontrol by the left hemisphere in this type of cognitive task.

Keywords


combined Stroop test, event-related potentials, interhemispheric interaction, metacontrol

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Received: 13.04.2020

Revised: 14.05.2020

Signed for press: 15.05.2020




DOI: http://dx.doi.org/10.17721/1728_2748.2020.81.21-25

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