Table 2.

Summary of permutation statistics for CPE, APE and SampEn for τ = 1 and m = 3, comparing the original time series X with surrogates preserving only the power spectrum (X⁽¹⁾) or both the power spectrum and the probability distribution (X⁽²⁾) of X. Numbers in cells are t-values. Statistical significance codes: *p < 0.05, **p < 0.01, ***p < 0.001.

	Cross-prediction error	Auto-prediction error	Sample entropy
56–328 ms: X versus X(1)	2.5079*	−1.2955	−19.1824***
56–328 ms: X versus X(2)	3.4628**	−5.6917***	− 26.5761***
328–600 ms: X versus X(1)	2.4796*	−5.9648***	−20.3898***
328–600 ms: X versus X(2)	1.5396	−15.0138***	−17.0309***
X: 56–328 ms versus 328–600 ms	−2.332*	2.8185**	4.8062***
X(2): 56–328 ms versus 328–600 ms	−5.3173***	−4.9702***	3.6474**
X(1): 56–328 ms versus 328–600 ms	−3.7062**	−1.2848	0.8949