"Hyperfeedback" as a Tool to Assess and Induce Interpersonal Synchrony: The Role of Applied Social Neurosciences for Research, Training, and Clinical Practice

In the last 25 years, the field of neuroscience has seen exponential growth due to technological advances, which have not only allowed for collecting more accurate data, but also for addressing a variety of innovative studies for human development understanding. Neurofeedback (NF), and particularly Brain–Computer Interfaces (BCI) applications, are among the most promising methods, since they enable individuals to interact with a computer by using their brain activity to learn implicitly and train some specific cognitive and affective functions. These applications proved to be suitable for many different fields, from research to clinical practice. However, NF was used only in individual settings, with participants interacting with a computer, while more ecological and complex phenomena could be better explored in interactive contexts. In the present work, we propose that the future of BCI provided NF may lie in the development of interactive settings where two or more participants can be informed about their inter-brain synchrony to train and reinforce them towards enhanced joint interactions and promote learning and empowerment. We propose that BCI methods should move to brain-X-brain-computer interfaces (B2CI). In this new protocol, that we called “hyperfeedback,” brain signals coming from two people involved in a joint setting are processed so to provide a compound feedback. The possible applications of such a paradigm are discussed