beyond the low frequency fluctuations: morning and evening differences in human brain
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2019
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Abstract
Human performance, alertness, and most biological functions express rhythmic fluctuations across a 24-h-period. This phenomenon is believed to originate from differences in both circadian and homeostatic sleep-wake regulatory processes. Interactions between these processes result in time-of-day modulations of behavioral performance as well as brain activity patterns. Although the basic mechanism of the 24-h clock is conserved across evolution, there are interindividual differences in the timing of sleep-wake cycles, subjective alertness and functioning throughout the day. The study of circadian typology differences has increased during the last few years, especially research on extreme chronotypes, which provide a unique way to investigate the effects of sleep-wake regulation on cerebral mechanisms. Using functional magnetic resonance imaging (fMRI), we assessed the influence of chronotype and time-of-day on resting-state functional connectivity. Twenty-nine extreme morning- and 34 evening-type participants underwent two fMRI sessions: about 1 h after wake-up time (morning) and about 10 h after wake-up time (evening), scheduled according to their declared habitual sleep-wake pattern on a regular working day. Analysis of obtained neuroimaging data disclosed only an effect of time of day on resting-state functional connectivity; there were different patterns of functional connectivity between morning (MS) and evening (ES) sessions. The results of our study showed no differences between extreme morning-type and evening-type individuals. We demonstrate that circadian and homeostatic influences on the resting-state functional connectivity have a universal character, unaffected by circadian typology.
| Reference Key |
fafrowicz2019frontiersbeyond
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| Authors | ;Magdalena Fafrowicz;Magdalena Fafrowicz;Bartosz Bohaterewicz;Anna Ceglarek;Monika Cichocka;Koryna Lewandowska;Barbara Sikora-Wachowicz;Halszka Oginska;Anna Beres;Justyna Olszewska;Tadeusz Marek |
| Journal | egyptian journal of radiology and nuclear medicine |
| Year | 2019 |
| DOI |
10.3389/fnhum.2019.00288
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| URL | |
| Keywords |
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