Abstract
Cognitive flexibility and reward processing critically rely on the orbitofrontal cortex. Dysregulations in these domains and orbitofrontal activation have been reported in major psychiatric disorders. Haemodynamic brain imaging informed neurofeedback allows regional-specific control over brain activation and thus may represent an innovative intervention to regulate orbitofrontal dysfunctions. Against this background the present proof-of-concept study evaluated the feasibility and behavioral relevance of functional Near-Infrared Spectroscopy (fNIRS) assisted neurofeedback training of the lateral orbitofrontal cortex (lOFC). In a randomized sham-controlled between-subject design 60 healthy participants underwent four subsequent runs of training to enhance lOFC activation. Training-induced changes in the lOFC, attentional set shifting performance and reward experience served as primary outcomes. Feedback from the target channel significantly increased regional-specific lOFC activation over the four training runs in comparison with sham feedback. The experimental group demonstrated a trend for faster responses during set shifting relative to the sham group. Within the experimental group stronger training-induced lOFC increases were associated with higher reward experience. The present results demonstrate that fNIRS-informed neurofeedback allows regional-specific regulation of lOFC activation and may have the potential to modulate associated behavioral domains. As such fNIRS-informed neurofeedback may represent a promising strategy to regulate OFC dysfunctions in psychiatric disorders.
