Investigation of cortical communication created in the stroop test using functional near-infrared spectroscopy (fNIRS)

Background and Aim : Introduction: The Stroop test is a well-known model for semantic conflict processing in cognitive neuroscienc. Stroop interference denotes the decline in performance under the incongruent condition, which requires selective attention and control of competitive responses. Functional near-infrared spectroscopy (fNIRS) can identify activated brain regions associated with the Stroop interference effect.Methods : Methods: Twelve right handed healthy controls were investigated by means of a multi-channels fNIRS unit during the execution of the Stroop test. Effective connectivity changes in the prefrontal cortex between Stroop attentional conflict and rest states were calculated using DCM approach to investigate (1) areas known for selective attention and (2) to analyze inter-network functional connectivity strength (FCS) by selecting several brain functional networks.Results : Results: The results indicated that during incongruent condition, an increased activity was recorded in the LDLPFC while under neutral condition, the increase in activity in those areas was even more pronounced. Stroop interference effect associated with a significant consistent increase in the RDLPFC to DMPFC, LDLPFC to DMPFC and LDLPFC to RPFC effective connectivity strengths.Conclusion : Conclusion: This research aimed to identify the neural correlates associated with the Stroop tasks within the brain activated regions. The use of DCM algorithm for fNIRS data with respect to fMRI has provided additional information about the directional connectivity and causal interactions in LPFC networks during a conflict processing. Eventually, high temporal resolution fNIRS can be a promising tool for monitoring functional brain activation under the cognitive paradigms in neurological research and psychotherapy applications.

کلیدواژه ها:

Stroop ، fNIRS ، connectivity ، prefrontal cortex ، attention