Peng, C.-K., Havlin, S., Stanley, H.E., Goldberger, A.L. (1995) Quantification of scaling exponents and crossover phenomena in nonstationary heartbeat time series. Chaos 6:82-87 Perkel, D.H., Gerstein, G.L., Moore, G.P. (1967) Neuronal spike trains and stochastic point processes. Biophys. J. 7:419-440 Pezard, L., Martinerie, J., Varela, F.J., Bouchet, F., Guez, D., Derouesne, C., Renault, B. (1998) Entropy maps characterize drug effects on brain dynamics in Alzheimer's disease Neurosci Lett 253:5-8 Pezard, L., Nandrino, J.L., Renault, B., Massioui, F.E., Allilaire, F., Muller, J. (1996) Depression as a dynamic disease. Biol. Psychiat. 39:991-999 Pijn, J., Velis, D., van der Heyden, M., DeGoede, J., van Veelen, C.W., Lopes da Silva, F. (1997): Nonlinear dynamics of epileptic seizures on basis of intracranial EEG recordings. Brain Topogr. 9:249-70 Pincus, S.M. (1991) Approximate entropy as a measure of a system’s complexity. Proc. Natl. Acad. Sci. 88:2297-2301 Pincus, S.M., Gladstone, |.M., Ehrenkranz, R.A. (1991) A regularity statistic for medical data analysis. J Clin Monit 7:335-245 Pincus, S.M.,Minkin, M.J. (1998) Assessing sequential irregularity of both endocrine and heart rate rhythms. Curr Opin Obstet Gynecol 10:281-291 Popivanov, D., Mineva, A., Dushanova, J. (1998) Tracking EEG signal dynamics during mental tasks. A combined linear/nonlinear approach. IEEE Eng Med Biol 17:89-95 280 HOUSE_OVERSIGHT_013780