Figure 4. Extension of DFA to longer window sizes.

Extending DFA from a maximum window size of 1/10 of the length of the signal (N = the length of the signal) to a maximum window size of 1/4 of the length of the signal showed a strong correlation between exponents (A) with R² = 0.79 indicating that the LRTCs apply to this broader range of time scales. DFA exponents (B), calculated with a maximum window size of 1/4, for each subject (vertical lines, averaged across channels), are again clearly distinct from the pooled probability distributions for the shuffled sequences.