FIGURE 2.

(A) A schematic representation of simultaneous fMRI recording using multiple scanners. Adapted from “Moral cognition and its neural constituents,” by Casebeer (2003). Copyright 2003 by Nature Publishing Group. Adapted with permission. (B) A specially designed dual-head coil for fMRI hyperscanning in a single scanner. Adapted from “Decoupled circular-polarized dual-head volume coil pair for studying two interacting human brains with dyadic fMRI,” by Lee et al. (2012). Copyright 2011 by Wiley Periodicals, Inc., Adapted with permission. (C) Simultaneous recording of Functional Near-Infrared Spectroscopy (fNIRS) data from two individuals participating in computer-based cooperation tasks using a single recording device. Adapted from “Sex differences in neural and behavioral signatures of cooperation revealed by fNIRS hyperscanning,” by Baker et al. (2016). Copyright 2016 by Macmillan Publishers Limited. Used under Creative Commons Attribution 4.0 International License. (D) Magnetoencephalography (MEG) hyperscanning of a mother and her infant. A mother and her infant look at each other’s facial expressions while simultaneous MEG recordings are performed in two separate scanners. Adapted from “Hyperscanning MEG for understanding mother-child cerebral interactions,” by Hirata et al. (2014). Copyright 2014 by Hirata et al. used under Creative Common Attribution (“CC BY”) version 4.0 license.