Channel‐wised inter‐brain neural synchronization analysis
INS, GCA
First, WTC was also applied in the channel‐wised INS analysis and a series of one‐sample For CHs that showed significant INS increments in each group, Granger causality analysis (GCA) was conducted to determine the direction of synchronization. GCA is a method that uses vector autoregressive models to measure the causal relationship between time series such as the fNIRS data and provides a neurobiological suggestion of coupling directionality, that is, which individual (the acupuncturist or the subject) is more actively driving the other. The HERMES MatLab package (