▽ Hyperscanning is a technique that allows the simultaneous recording of brain activity of different subjects. ▽ It allows to study inter-brain correlations between cerebral activity of a group of interacting subjects as a unique system. ▽ Ecologic experimental designs have been adopted to create an interaction between subjects similar to real life social exchange. ▽ Hyperscanning is a potentially revolutionary new approach, which has not yet been used extensively in social neuroscience. ▽ It may provide an answer to many open questions in the study of the social brain.
This paper reviews the published literature on the hyperscanning methodologies using hemodynamic or neuro-electric modalities. In particular, we describe how different brain recording devices have been employed in different experimental paradigms to gain information about the subtle nature of human interactions. This review also included papers based on single-subject recordings in which a correlation was found between the activities of different (non-simultaneously recorded) participants in the experiment. The descriptions begin with the methodological issues related to the simultaneous measurements and the descriptions of the results generated by such approaches will follow. Finally, a discussion of the possible future uses of such new approaches to explore human social interactions will be presented.