Figure 2
From: The topology of interpersonal neural network in weak social ties
The procedure of intra- and inter-brain electroencephalography (EEG) analysis. (A) We collected EEG data from two participants simultaneously. These EEG datasets were filtered into theta, alpha, and beta bands. (B) We calculated intra- and inter-brain EEG synchronization. The areas enclosed by the blue triangles show the intra-brain synchronization of participants 1 and 2, respectively. The “intra 1” shows within brain synchronization in participant 1 and the “intra 2” shows within brain synchronization of participant 2. The area enclosed by the red square shows inter-brain synchronization. (C) We compared original EEG synchronization to surrogate EEG synchronization and conducted binarization of intra- and inter-brain synchronization (values equal 1 if original synchronization was significantly larger than that of surrogate, else, it equals 0). Note that the upper portion of the matrices were omitted because it is vertically symmetric. (D) From the binary matrices of intra- and inter-brain, we created an interpersonal neural network.
