Fig. 4
From: Trait paranoia shapes inter-subject synchrony in brain activity during an ambiguous social narrative
Inter-subject correlation (ISC) scales continuously with trait paranoia. Post-hoc analyses for two regions of interest (ROIs) that emerged from the dichotomized contrast between high- and low-paranoia groups (cf. Fig. 3a): left temporal pole (top row) and right medial prefrontal cortex (PFC, bottom row). a Location of ROI (left) and participant-by-participant ISC matrix (right) for the left temporal pole. Participants are ordered by increasing trait paranoia score. Each matrix element reflects the correlation between two participants’ activation time courses in the left temporal pole during narrative listening. Higher correlations are visible as one moves to the right and down along the diagonal, representing pairs of increasingly high-paranoia individuals. b Scatter plot of paranoia rank vs. median ISC value—i.e., the median of each row of the ISC matrix in a. Each dot represents a participant. Rank correlation indicates a significant monotonic relationship between trait paranoia and median ISC in left temporal pole (rs = 0.71, p = 0.0002). c Location of ROI and participant-by-participant ISC matrix for the right medial PFC. Participants are ordered as in a. d Scatter plot of each participant’s paranoia rank vs. their median ISC value in the right medial PFC. As in b, rank correlation indicates a significant monotonic relationship between paranoia rank and median ISC (rs = 0.63, p = 0.0016)
