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Stochastic resonance on paced genetic regulatory small-world networks: effects of asymmetric potentialsPerc, MatjažWe study the phenomenon of stochastic resonance on small-world networks consisting of bistable genetic regulatory units, whereby the external subthreshold periodic forcing is introduced as a ... pacemaker trying to impose its rhythm on the whole network through the single unit to which it is introduced. Without the addition of additive spatiotemporal noise, however, the whole network remains forever trapped in one of the two stable steady states of the local dynamics. We show that the correlation between the frequency of subthreshold pacemaker activity and the response of the network is resonantly dependent on the intensity of additive noise. The reported pacemaker driven stochastic resonance depends significantly on the asymmetry of the two potential wells characterizing the bistable dynamics, which can be tuned via a single system parameter. In particular, we show that the ratio between the clustering coefficient and the characteristic path length is a suitable quantity defining the ability of a small-world network to facilitate the outreach of the pacemaker-emitted subthreshold rhythm, but only if the asymmetry between the potentials is practically negligible. In case of substantially asymmetric potentials the impact of the small-world topology is less profound and cannot warrant an enhancement of stochastic resonance by units that are located far from the pacemaker.Source: The European physical journal. B, Condensed matter physics. - ISSN 1434-6028 (Vol. 69, no 1, 2009, str. 147-153)Type of material - article, component partPublish date - 2009Language - englishCOBISS.SI-ID - 13250582
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source: The European physical journal. B, Condensed matter physics. - ISSN 1434-6028 (Vol. 69, no 1, 2009, str. 147-153)
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