Concealed face recognition analysis based on Recurrence Plots

In this study we have used Recurrence Plots (RPs) in order to discriminate between guilty and innocent subjects, using their single-trial ERPs. Data were recorded during the Guilty Knowledge Test (GKT). The results from 49 subjects who participated in concealed face recognition test indicate that amplitude of some RQA variables in guilty subjects are significantly higher than innocent ones, around 300ms (P<0.05). Increment of these RQA variables are relating to complexity reduction of brain's system, during familiar face recognition. Also, results show that appearance of the P300 component can increase determinism and synchronization, in brains' signals.

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