An investigation of brain-to-brain coherence in the prefrontal cortex during joint sentence reading and joint fluid reasoning tasks

Çakır, Murat Perit
Taşcı, Çağatay
Lack of an interactive context for joint action is an important limitation in social neuroscience studies. Portable brain imaging technologies such as functional near-infrared spectroscopy (fNIRS) have made it practical to simultaneously monitor the brain hemodynamics of two or more people engaged in social interaction. In this study, the modulation of inter-brain coherence is investigated in two different joint activity scenarios. In the first experiment, 22 dyads simultaneously read aloud matching and mismatching sentences in three conditions that differed in terms of the clarity in which partners hear each others’ voices. Behavioral analysis indicated that participants significantly performed better when they could hear the other partner, F(1.55,43.35)=78.53,p<.001, and when the sentences match each other, F(1,28)=14.31,p<.01. A wavelet-transform coherence analysis (WTC) conducted on deoxy-hemoglobin (HbR) changes suggest that the level of inter-brain coherence in the right superior frontal cortex (SFC) tends to increase depending on the level of behavioral synchrony among the participants. In the second study (ongoing), 4 dyads attempted to solve Raven-like visual pattern completion tasks, where the pieces were revealed only when both partners’ eyes dwell on the same box. WTC analysis of eye gaze data indicated that a significantly higher level of gaze coherence occurred during the actual task as compared to a free-viewing practice, F(1.44,4.33)=8.28,p<.05. The strongest coherence in HbR signals was around right SFC. Hyperscanning studies focusing on different joint tasks also found increased coherence in the right SFC, which altogether highlight this area's important role in the facilitation of joint attention and coordination.
25th Annual Meeting of the Cognitive Neuroscience Society, 24 - 27 Macrh 2018


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Citation Formats
M. P. Çakır and Ç. Taşcı, “An investigation of brain-to-brain coherence in the prefrontal cortex during joint sentence reading and joint fluid reasoning tasks,” presented at the 25th Annual Meeting of the Cognitive Neuroscience Society, 24 - 27 Macrh 2018, Boston, USA, 2018, Accessed: 00, 2021. [Online]. Available: