Fig 1.
Experimental procedure representing the setting and the experimental tasks.
Fig 2.
The location of NIRS channels. The emitters (orange) were placed on positions FC3-FC4 and F1-F2, while detectors (red) were placed on FC1-FC2 and F3-F4. The resulting channels (green) were as follows: Ch 1 and Ch 3 correspond to the left and right DLPFC. Ch 2 and Ch 4 correspond to the left and right DPMC. Ch 5 and Ch 7 correspond to the left and right FEF. Ch 6 and Ch 8 correspond to the left and right SFG.
Fig 3.
RTs modulation as a function of Condition (pre vs post). The speed performance was characterized by faster RTs during the post-feedback condition.
Fig 4.
Bar graph (a) and intra-brain connectivity map (b) of O2Hb correlations as a function of Localization (averaged for pre- and post-feedback). The results showed that intra-brain connectivity was generally higher in DLPFC than in other areas, independently from the pre- or post-feedback.
Fig 5.
Bar graph (a) and inter-brain connectivity map (b) of O2Hb correlations as a function of Condition and Localization. The results showed that inter-brain connectivity increased in the post-feedback stage compared to pre-feedback in DLPFC.
Fig 6.
Increased Index was observed in post-feedback than pre-feedback condition within the DLPFC, thus suggesting a general increased inter-brain connectivity compared to intra-brain connectivity in DLPFC for the post-feedback condition.
Fig 7.
RTs revealed a significant negative correlation with the inter-brain connectivity within right (a) and left (b) DLPFC in post-feedback conditions, such that the increased right and left DLPFC connectivity was related to a reduction of RTs values in post-feedback condition.