Before revision:  Test results prove that it is effective to quantity time irreversibility by measuring probabilistic divergence of symmetrical ordinal patternsand validate our hypothesis that epilepsy has lasting impacts on brain' nonlinear dynamics, leading to a decline in brain signals directional asymmetry or time irreversibility, and the losing temporal asymmetries stemming from our findings may contribute to the preclinical diagnosis of epilepsy .
After revision:  Test results prove that it is effective to quantity time irreversibility by measuring the subtraction-based probabilistic differences between symmetric order patterns, and our findings highlight the manifestation of nonlinearity of whether healthy or diseased EEGs and suggest that the epilepsy leads to a decline in brain signals directional asymmetry or time irreversibility, and the losing temporal asymmetries stemming from our findings may contribute to the preclinical diagnosis of epilepsy .