Table 2 The continuous predictors initially included in the five regression models predicting the mean level of socially relevant inter-brain synchrony between the interacting individuals. In the subheadings, RC stands for right central, LC stands for left central, and RP stands for right parietal regions. The p values represent the adjusted values, with significant p values ( p < 0.05 ) after FDR correction marked in bold.

Predictor	\(\beta\)	SE (\(\beta\))	T	p	CI (95%)
High alpha RC-LC
Raven mean	\(-0.00056\)	0.00165	\(-0.338\)	0.739	\(-0.00406, 0.00294\)
Raven difference	\(-0.00049\)	0.00099	\(-0.491\)	0.630	\(-0.00259, -0.00161\)
Time spent on interaction	\(-0.00001\)	0.00001	\(-0.070\)	0.945	0.00001, 0.00001
Beta RC cluster
Raven mean	\(-0.00586\)	0.00290	\(-2.020\)	0.062	\(-0.01204, 0.00032\)
Raven difference	\(-0.00358\)	0.00175	\(-2.050\)	0.058	\(-0.00731, 0.00014\)
Time spent on interaction	\(-0.00037\)	0.00002	\(-1.585\)	0.134	\(-0.00009, 0.00001\)
IRI fantasy	0.00151	0.00065	2.312	0.208	0.00012, 0.00289
Beta LC-RP
Raven mean	\(-0.00216\)	0.00068	\(-3.150\)	0.007	\(-0.00362, -0.00070\)
Raven difference	\(-0.00149\)	0.00041	\(-3.611\)	0.003	\(-0.00237, -0.00061\)
Time spent on interaction	\(-0.00001\)	0.00001	\(-1.796\)	0.093	\(-0.00002, 0.00000\)
IRI fantasy	0.00079	0.00015	5.156	0.001	0.00046, 0.00047
Gamma RC cluster
Raven mean	\(-0.00996\)	0.00474	\(-2.101\)	0.053	\(-0.02006, 0.00014\)
Raven difference	\(-0.00642\)	0.00285	\(-2.250\)	0.040	\(-0.01250, -0.00034\)
Time spent on interaction	\(-0.00006\)	0.00004	\(-1.642\)	0.121	\(-0.00015, 0.00002\)
IRI fantasy	0.00250	0.00106	2.353	0.196	0.00024, 0.00477
Gamma LC cluster
Raven mean	\(-0.00318\)	0.00120	\(-2.638\)	0.019	\(-0.00575, -0.00061\)
Raven difference	\(-0.00208\)	0.00073	\(-2.869\)	0.012	\(-0.00363, -0.00054\)
Time spent on interaction	\(-0.00002\)	0.00001	\(-2.084\)	0.055	\(-0.00004, 0.00000\)
IRI fantasy	0.00085	0.00027	3.161	0.039	0.00028, 0.00143

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