Visual stimuli.

<p>(<i>A</i>) Snapshots of the stimuli presented during the four hand-waving blocks of the IMC phase. Two instances of dots are presented (top and bottom frames) to illustrate that the dot-counting task demanded attention towards the actor’s actions. (<i>B</i>) Stimuli comprising the AI phase. Each trial began with the warning stimulus (<i>top</i>), after which the imperative stimulus (coloured dot) was presented, superimposed over congruent (<i>middle</i>) or incongruent (<i>bottom</i>) actions. NB: The actor has provided written informed consent, as outlined in the PLOS consent form, for the publication of this image. Although her identity is concealed in this figure, her eyes were visible throughout all experimental stimuli.</p

Estimates of mediatory effect of perceived synchronicity.

<p>Estimate values after 1000 bootstrapped resamples.</p><p> = The Asynch condition served as the reference group;</p><p>SE = standard error; CI<i>_lower</i> and CI<i>_upper</i> = 95% lower- and upper-level confidence interval, respectively.</p

Primary results.

<p>(<i>A</i> and <i>B</i>) Results of Mann-Whitney tests, revealing a greater willingness to co-operate and enhanced likeability ratings in participants who provided higher ratings of PS; * = p<.05. (<i>C</i>) Results of one-way ANOVA, illustrating reduced AI in the Temp compared with the Asynch condition. Error bars present standard error; * = p<.05. (<i>D</i>) Results of the regression analysis, illustrating that AI decreases as a function of increasing subjective ratings of synchronicity. Regression line: <i>AI</i> = −1.05 <i>PS</i>+74.49.</p

An example of spatial representation of post-stimulus interactions after targets between all investigated brain sites in one subject (No.7).

<p>Correlation results are arranged in the triangular matrices into groups according to brain structures (delimited by black lines)(D) and in graphic form of “glass brains” with linked pairs of investigated electrode contacts (A – Coronal, B – Sagittal, C – Axial). Matrix values and links are colored according to the percentage of duration of the increase (red) or decrease (blue) in cross-correlations within time window 250–750 ms after stimulation. Three selected frequency bands – δ (left panel), β (middle panel), and upper γ (right panel).</p

Timing of significant post-target cross-correlation increases across all subjects and areas.

<p>The duration was determined as the mean level of corresponding changes over contact pairs, and the occurrence was given as the center of changes.</p

Relative incidences of significant post-stimulus changes in inter-areal cross-correlations (A – monopolar; B – bipolar) and post-stimulus power changes (C – monopolar; D – bipolar) across all investigated subjects.

<p>Statistical significance of target/frequent differences is indicated by asterisks.</p

Patient characteristics.

a<p>T, temporal; F, frontal; P, parietal; O, occipital; R, right; L, left; HS, hippocampal sclerosis; FCD, focal cortical displasia; DNET, dysembryoplastic neuroepitelial tumour; EMC, encephalomeningocele.</p

Matrices with significant correlation changes in three subjects; three frequency bands – δ (2–4 Hz), β (12–20 Hz), and upper γ (55–95 Hz), and two different stimuli – targets vs.frequents, for monopolar and bipolar montages.

<p>The correlation increase is highlighted in red, decrease in blue. Each colored line corresponds to changes in a contact pair in time (notice all pairs of investigated subject’s contacts are represented in individual matrices for each patient). Green vertical lines define interval 250–750 ms after stimuli.</p

Spatial distribution of couplings/decouplings across all investigated subjects, in the time window 250–750 ms after targets.

<p>Three orthogonal views of a transparent “glass brain”; links are colored according to the percentage of duration of the increase (red) or decrease (blue) in cross-correlations within time window 250–750 ms after stimulation. Three selected frequency bands – δ (left panel), β (middle panel), and upper γ (right panel).</p

Temporal characteristics of significant cross-correlation changes after targets for monopolar (A) and bipolar montages (B).

<p>Standard deviations are given in brackets.</p