1. Centrality of Social Interaction in Human Brain Function
Riitta Hari, Linda Henriksson, Sanna Malinen, Lauri Parkkonen 
Neuron 
Volume 88, Issue 1, Pages (October 2015)
DOI: /j.neuron
Copyright © 2015 Elsevier Inc. Terms and Conditions

2. Figure 1
Conceptual Differences between Spectator and Interactor Brain-Imaging Settings
Left: the subject is a passive spectator and the stimulus–response effects are unidirectional. Right: in a real-life situation (in setups of two-person neuroscience), the subject to be studied is an engaged interactor, and the (closed-loop) stimuli change according to both subjects’ reactions.
Neuron  , DOI: ( /j.neuron )
Copyright © 2015 Elsevier Inc. Terms and Conditions

3. Figure 2 Examples of Brain Imaging Setups
(1)–(3) are single-person setups, (4) can be studied either in a single-person setup (studying the members of the dyad sequentially) or in a 2PN setup, (5) requires a 2PN setup. (1) Subject receives simplified but well-controlled sensory stimuli. (2) Subject receives static pictures of social stimuli, e.g., faces. (3) Subject receives dynamical stimuli, e.g., movies or, for mirroring studies, live actions. (4) Two persons are interacting, e.g., in an economic game or by writing. Here the time lags between the two subjects’ interactive actions or responses are long. (5) Two persons are engaged in true, real-time social interaction, such as conversation. The interaction is dynamic and the responses and alignment can overlap in time.
Neuron  , DOI: ( /j.neuron )
Copyright © 2015 Elsevier Inc. Terms and Conditions