Berlin 2012 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 18: Posters: Statistical Physics in Biological Systems

BP 18.20: Poster

Mittwoch, 28. März 2012, 17:30–19:30, Poster A

Neural dynamics during sleep: state switching and oscillations — •Jens Christian Claussen — Institut für Neuro- und Bioinformatik, Universität zu Lübeck

The mammalian brain during sleep exhibits various interesting dynamical phenomena including switching processes from the neural microscale [1] to collective phase transitions, which, including regulatory mechanisms, give rise to the sleep-wake cycle. In addition, sleep state switching shows stochasticity [2,3]. On the time scale, the processes are separated from spikes (1ms) to spindle and burst lengths (1s) [4,5] via sleep states (100-10000s) to the ultradian (1.5h) and circadian rhythm. Sleep-associated oscillations are also separated in the frequency domain, and show rich complexity [3] including entrainment of spindles (12-15 Hz) by slow oscillations (0.8 Hz) [6]. In some cases, these oscillations can be influenced by electrical stimulation, observing a significant phase-dependence [4].

[1] J. Mayer et al, PRE 73, 0131908 (2006), [2] Lo et al. EPL 57, 625 (2002), [3] E. Olbrich, J.C. Claussen, P. Achermann, Phil. Trans. Roy. Soc. A 369, 3884 (2011), [4] A. Weigenand, T. Martinetz and J.C. Claussen (subm.), [5] H.-V. Ngo et al, EPL 89, 68002 (2010), [6] J. Mayer et al, PRL 99, 068102 (2007)