Amnestically induced persistence in random walks

Details Amnestically induced persistence in random walks Amnestically induced persistence in random walks

2006-11-17

arxiv.org/abs/cond-mat/0611477v2

Phys. Rev. Lett. vol 98, 070603 (2007)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figs, subm. to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.070603

We study how the Hurst exponent $\alpha$ depends on the fraction $f$ of the total time $t$ remembered by non-Markovian random walkers that recall only the distant past. We find that otherwise nonpersistent random walkers switch to persistent behavior when inflicted with significant memory loss. Such memory losses induce the probability density function of the walker's position to undergo a transition from Gaussian to non-Gaussian. We interpret these findings of persistence in terms of a breakdown of self-regulation mechanisms and discuss their possible relevance to some of the burdensome behavioral and psychological symptoms of Alzheimer's disease and other dementias.

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