Multifractal signatures of complexity matching

Abstract : The complexity matching effect supposes that synchronization between complex systems could emerge from multiple interactions across multiple scales and has been hypothesized to underlie a number of daily-life situations. Complexity matching suggests that coupled systems tend to share similar scaling properties, and this phenomenon is revealed by a statistical matching between the scaling exponents that characterize the respective behaviors of both systems. However, some recent papers suggested that this statistical matching could originate from local adjustments or corrections, rather than from a genuine complexity matching between systems. In the present paper, we propose an analysis method based on correlation between multifractal spectra, considering different ranges of time scales. We analyze several datasets collected in various situations (bimanual coordination, interpersonal coordination, and walking in synchrony with a fractal metronome). Our results show that this method is able to distinguish between situations underlain by genuine statistical matching and situations where statistical matching results from local adjustments.
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Didier Delignieres, Zainy M.H. Almurad, Clément Roume, Vivien Marmelat. Multifractal signatures of complexity matching. Experimental Brain Research, Springer Verlag, 2016, 234 (10), pp.2773-2785. ⟨10.1007/s00221-016-4679-4⟩. ⟨hal-02417612⟩

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