Characterizing Signatures of Evoked Brain Activity in Multiple Electrode Data from Different Brain Regions

This paper describes the application of ambiguity function analysis to human EEG records. The aim was to identify signatures of enhanced brain activity when a reversal of the bistable Neckar cube figure is perceived by the subject. The results have shown high activity patterns in both time and frequency domains, in the pre-frontal cortex region, approximately 200 - 600 ms prior to the appearance of the readiness potential in the central cortex. From a methods perspective, this paper illustrates the applicability of such bilinear, global analysis techniques, to the study of brain data particularly to characterize the time-frequency dynamics of brain electrical activity