The two samples compared correspond to a random sample (N=7) and a non-random sample (N=13) of subjects from which EEG recordings were obtained in basal resting conditions with eyes closed, using the Emotiv Epoc brain-computer interface (Research Edition), with a sampling rate of 128Hz. The study also compared the behavior of the nonlinear estimators in 4 sub-second time processing windows (125ms, 250ms, 500ms, and 1s). The overall results of all the comparisons made were consistent in the inter-group comparison, but at the same time some differences between the two samples were revealed. The study also revealed some differences at the intra-group level, as well as at the intra- and inter-individual scales. The use of entropic brain profiles proved to be a powerful tool to conduct an investigation of the non-linear phenomenology of EEG and its implications on the order/chaos balance of the brain. (C) 2021 The Authors. Published by Elsevier B.V.