Fractal Patterns of Neural Activity Exist within the Suprachiasmatic Nucleus and Require Extrinsic Network Interactions

Kun Hu, Johanna H. Meijer, Steven Shea, Henk Tjebbe vanderLeest, Benjamin Pittman-Polletta, Thijs Houben, Floor van Oosterhout, Tom Deboer, Frank A J L Scheer

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The mammalian central circadian pacemaker (the suprachiasmatic nucleus, SCN) contains thousands of neurons that are coupled through a complex network of interactions. In addition to the established role of the SCN in generating rhythms of ~24 hours in many physiological functions, the SCN was recently shown to be necessary for normal self-similar/fractal organization of motor activity and heart rate over a wide range of time scales-from minutes to 24 hours. To test whether the neural network within the SCN is sufficient to generate such fractal patterns, we studied multi-unit neural activity of in vivo and in vitro SCNs in rodents. In vivo SCN-neural activity exhibited fractal patterns that are virtually identical in mice and rats and are similar to those in motor activity at time scales from minutes up to 10 hours. In addition, these patterns remained unchanged when the main afferent signal to the SCN, namely light, was removed. However, the fractal patterns of SCN-neural activity are not autonomous within the SCN as these patterns completely broke down in the isolated in vitro SCN despite persistence of circadian rhythmicity. Thus, SCN-neural activity is fractal in the intact organism and these fractal patterns require network interactions between the SCN and extra-SCN nodes. Such a fractal control network could underlie the fractal regulation observed in many physiological functions that involve the SCN, including motor control and heart rate regulation.

Original languageEnglish (US)
Article numbere48927
JournalPLoS One
Volume7
Issue number11
DOIs
StatePublished - 2012

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Fractals
Suprachiasmatic Nucleus
heart rate
neural networks
rodents
neurons
rats
organisms
mice
Pacemakers
Complex networks
Motor Activity
testing
Heart Rate
Neurons
Rats
Neural networks
Periodicity
Rodentia

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Hu, K., Meijer, J. H., Shea, S., vanderLeest, H. T., Pittman-Polletta, B., Houben, T., ... Scheer, F. A. J. L. (2012). Fractal Patterns of Neural Activity Exist within the Suprachiasmatic Nucleus and Require Extrinsic Network Interactions. PLoS One, 7(11), [e48927]. https://doi.org/10.1371/journal.pone.0048927

Fractal Patterns of Neural Activity Exist within the Suprachiasmatic Nucleus and Require Extrinsic Network Interactions. / Hu, Kun; Meijer, Johanna H.; Shea, Steven; vanderLeest, Henk Tjebbe; Pittman-Polletta, Benjamin; Houben, Thijs; van Oosterhout, Floor; Deboer, Tom; Scheer, Frank A J L.

In: PLoS One, Vol. 7, No. 11, e48927, 2012.

Research output: Contribution to journalArticle

Hu, K, Meijer, JH, Shea, S, vanderLeest, HT, Pittman-Polletta, B, Houben, T, van Oosterhout, F, Deboer, T & Scheer, FAJL 2012, 'Fractal Patterns of Neural Activity Exist within the Suprachiasmatic Nucleus and Require Extrinsic Network Interactions', PLoS One, vol. 7, no. 11, e48927. https://doi.org/10.1371/journal.pone.0048927
Hu, Kun ; Meijer, Johanna H. ; Shea, Steven ; vanderLeest, Henk Tjebbe ; Pittman-Polletta, Benjamin ; Houben, Thijs ; van Oosterhout, Floor ; Deboer, Tom ; Scheer, Frank A J L. / Fractal Patterns of Neural Activity Exist within the Suprachiasmatic Nucleus and Require Extrinsic Network Interactions. In: PLoS One. 2012 ; Vol. 7, No. 11.
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