Theta low-gamma phase amplitude coupling in the human orbitofrontal cortex increases during a conflict-processing task

Kuang Hsuan Chen, Austin M. Tang, Zachary D. Gilbert, Roberto Martin Del Campo-Vera, Rinu Sebastian, Angad S. Gogia, Shivani Sundaram, Emiliano Tabarsi, Yelim Lee, Richard Lee, George Nune, Charles Y. Liu, Spencer Kellis, Brian Lee

研究成果: 雜誌貢獻文章同行評審


Objective. The human orbitofrontal cortex (OFC) is involved in automatic response inhibition and conflict processing, but the mechanism of frequency-specific power changes that control these functions is unknown. Theta and gamma activity have been independently observed in the OFC during conflict processing, while theta-gamma interactions in other brain areas have been noted primarily in studies of memory. Within the OFC, it is possible that theta-gamma phase amplitude coupling (PAC) drives conflict processing. This study aims to characterize the coupled relationship between theta and gamma frequency bands in the OFC during conflict processing using a modified Stroop task. Approach. Eight epilepsy patients implanted with OFC stereotactic electroencephalography electrodes participated in a color-word modified Stroop task. PAC between theta phase and gamma amplitude was assessed to determine the timing and magnitude of neural oscillatory changes. Group analysis was conducted using a non-parametric cluster-permutation t-test on coherence values. Main results. Theta-low gamma (LG) PAC significantly increased in five out of eight patients during successful trials of the incongruent condition compared with the congruent condition. Significant increases in theta-LG PAC were most prominent during cue processing 200-800 ms after cue presentation. On group analysis, trial-averaged mean theta-LG PAC was statistically significantly greater in the incongruent condition compared to the congruent condition (p < 0.001, Cohen's d = 0.51). Significance. For the first time, we report that OFC theta phase and LG amplitude coupling increases during conflict resolution. Given the delayed onset after cue presentation, OFC theta-LG PAC may contribute to conflict processing after conflict detection and before motor response. This explanation follows the hypothesis that global theta waves modulate local gamma signals. Understanding this relationship within the OFC will help further elucidate the neural mechanisms of human conflict resolution.

期刊Journal of Neural Engineering
出版狀態已發佈 - 2月 2022

ASJC Scopus subject areas

  • 生物醫學工程
  • 細胞與分子神經科學


深入研究「Theta low-gamma phase amplitude coupling in the human orbitofrontal cortex increases during a conflict-processing task」主題。共同形成了獨特的指紋。