Abstract

For about four decades data suggestive of correlations between functional states of two separated brains, not mediated by sensory or other known mechanisms, were reported, but the experimental evidence is still scarce and controversial. In this paper we briefly review studies in which one member of a pair of human subjects was physically stimulated and synchronous correlates were searched for in the brain electrical activity of the other, non-stimulated subject. We give a comprehensive account of our study of dyadic EEG correlations, discussing pros and contras of its design, and we review parallel and follow-up studies on the same topic carried out elsewhere. Possible directions of future research are discussed and novel experimental paradigms are proposed.