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Component N2pc in Studying Visual Attention

© 2022 A. S. Stoletniy, D. S. Alekseeva, V. V. Babenko, P. V. Anokhina, D. V. Yavna

Southern Federal University 344006 Rostov-on-Don, Bolshaya Sadovaya Str, 105/42, Russia

Received 05 Jul 2021

This article provides an review of the studies regarding the nature and properties of negative deflection of event- related potentials (N2pc). This lateralized component usually appears at 180300 ms after the onset of the visual stimulus and is calculated as the difference between the brain responses recorded in the contralateral parieto-occipital sites of both hemispheres. Nowadays, N2pc serves as a reliable indicator of the involvement of the brain’s cognitive resources in the process of identifying the location of a target. Initially, it was assumed that N2pc reflects the process of suppression of irrelevant stimuli in the course of perception; but later other points of view on its functional role arose, since the scientists got data on its connection with not only filtering, but also with the actual processing of the target stimulus. In addition, the peculiarities of the emergence of this component make it possible to study the mechanisms of the deployment of attention in both humans and animals. N2pc is now used also in the studies of attention in people with various mental and physical disorders.

Key words: attention, N2pc, event-related potentials (ERP), lateralized ERP, relevant stimulus, parallel search, sequential search, filtering, target, distractor, attention selectivity

DOI: 10.31857/S0235009222020068

Cite: Stoletniy A. S., Alekseeva D. S., Babenko V. V., Anokhina P. V., Yavna D. V. Komponent n2pc v issledovaniyakh zritelnogo vnimaniya [Component n2pc in studying visual attention]. Sensornye sistemy [Sensory systems]. 2022. V. 36(2). P. 109–123 (in Russian). doi: 10.31857/S0235009222020068

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