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PLoS One. 2018 Apr 6;13(4):e0195380. doi: 10.1371/journal.pone.0195380. eCollection 2018.

Time estimation and beta segregation: An EEG study and graph theoretical approach.

Author information

1
Cognitive Neuroscience Lab., Department of Psychology, University of Tabriz, Tabriz, Iran.
2
Iranian Neuro-wave Lab., Isfahan, Iran.
3
Department of Physics, Amirkabir University of Technology, Tehran, Iran.
4
Department of biology, North Tehran Branch, Islamic Azad University, Tehran, Iran.
5
Department of Genetic, Tehran medical sciences branch, Islamic Azad University, Tehran, Iran.
6
Faculty of Health Management and Information, Iran University of Medical Science, Tehran, Iran.
7
Department of Psychology, University of Isfahan, Isfahan, Iran.
8
Department of Psychology, Koç University, Istanbul, Turkey.

Abstract

Elucidation of the neural correlates of time perception constitutes an important research topic in cognitive neuroscience. The focus to date has been on durations in the millisecond to seconds range, but here we used electroencephalography (EEG) to examine brain functional connectivity during much longer durations (i.e., 15 min). For this purpose, we conducted an initial exploratory experiment followed by a confirmatory experiment. Our results showed that those participants who overestimated time exhibited lower activity of beta (18-30 Hz) at several electrode sites. Furthermore, graph theoretical analysis indicated significant differences in the beta range (15-30 Hz) between those that overestimated and underestimated time. Participants who underestimated time showed higher clustering coefficient compared to those that overestimated time. We discuss our results in terms of two aspects. FFT results, as a linear approach, are discussed within localized/dedicated models (i.e., scalar timing model). Second, non-localized properties of psychological interval timing (as emphasized by intrinsic models) are addressed and discussed based on results derived from graph theory. Results suggested that although beta amplitude in central regions (related to activity of BG-thalamocortical pathway as a dedicated module) is important in relation to timing mechanisms, the properties of functional activity of brain networks; such as the segregation of beta network, are also crucial for time perception. These results may suggest subjective time may be created by vector units instead of scalar ticks.

PMID:
29624619
PMCID:
PMC5889177
DOI:
10.1371/journal.pone.0195380
[Indexed for MEDLINE]
Free PMC Article

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