https://doi.org/10.1140/epjs/s11734-024-01290-4
Regular Article
Decreased brain functional connectivity is associated with faster responses to repeated visual stimuli
1
Innopolis University, 1 Universitetskaya, 420500, Innopolis, The Republic of Tatarstan, Russia
2
Baltic Center for Neurotechnology and Artificial Intelligence, Immanuel Kant Baltic Federal University, 14 A. Nevskogo, 236016, Kaliningrad, Russia
Received:
16
May
2024
Accepted:
2
August
2024
Published online:
9
August
2024
When processing repetitive visual stimuli, the brain experiences neuronal adaptation, a process that reduces its response time by pre-activating specific neural groups crucial for handling these stimuli. While prior research has extensively examined this phenomenon within distinct brain regions, the interactions between these regions during adaptation have remained less understood. In this study, we explored these inter-regional interactions by assessing functional connectivity using the phase locking value. Our analysis showed a reduction in functional connectivity both within the occipito-parietal region and between occipito-parietal and central regions as time spent on task increased. Interestingly, these changes in connectivity were positively correlated with shorter processing times for these stimuli. To determine whether these connectivity changes could be attributed to increasing fatigue, we also measured the amplitude–velocity ratio of blinks. Our results revealed no significant correlation between this indicator of fatigue and the observed shifts in connectivity. This suggests that the noted alterations in functional connectivity are more likely related to neuronal adaptation mechanisms, rather than merely reflecting changes in fatigue levels as detected through EEG signals.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
