The Necessity for a Time Local Dimension in Systems with Time Varying   Attractors
  We show that a simple non-linear system of ordinary differential equations may possess a time varying attractor dimension. This indicates that it is infeasible to characterize EEG and MEG time series with a single time global dimension. We suggest another measure for the description of non-stationary attractors. 
K. Saermark (The Technical University of Denmark), Y. Ashkenazy   (Bar-Ilan University), J. Levitan and M. Lewkowicz (Bar-Il...