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Related Experiment Video

Updated: Jul 26, 2025

Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis
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Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis

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The prefrontal cortex is differentially involved in implicit and explicit facial emotion processing: An fNIRS study.

Michael K Yeung1

  • 1Department of Psychology, The Education University of Hong Kong, Hong Kong, China; University Research Facility in Behavioral and Systems Neuroscience, The Hong Kong Polytechnic University, Hong Kong, China.

Biological Psychology
|June 19, 2023
PubMed
Summary

The prefrontal cortex (PFC) shows distinct activation patterns during facial emotion recognition. Functional near-infrared spectroscopy (fNIRS) reveals greater oxyhemoglobin (HbO) changes in the PFC during explicit emotion tasks compared to implicit tasks.

Keywords:
EmotionFacial expressionHemodynamicPrefrontal cortexfNIRS

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychophysiology

Background:

  • The prefrontal cortex (PFC) is implicated in facial emotion processing, but its specific roles in implicit versus explicit tasks are not fully understood.
  • Functional near-infrared spectroscopy (fNIRS) measures hemodynamic responses (oxyhemoglobin/HbO and deoxyhemoglobin/HbR), but its application to facial emotion processing requires further elucidation.
  • Understanding these differential roles is crucial for advancing cognitive neuroscience and developing targeted interventions.

Purpose of the Study:

  • To investigate and compare prefrontal cortex (PFC) activation during implicit and explicit facial emotion processing using fNIRS.
  • To examine the changes in oxyhemoglobin (HbO) and deoxyhemoglobin (HbR) concentrations in the PFC during these tasks.
  • To assess the test-retest reliability of fNIRS measures in the context of facial emotion processing.

Main Methods:

  • Forty young adults performed explicit (emotion discrimination) and implicit (age discrimination) facial-matching tasks.
  • Prefrontal cortex (PFC) activation was measured using functional near-infrared spectroscopy (fNIRS) during two separate sessions.
  • Behavioral data and hemodynamic responses (HbO, HbR) were recorded and analyzed for task differences and reliability.

Main Results:

  • The PFC exhibited increased HbO and/or decreased HbR during both implicit and explicit facial emotion tasks.
  • Significantly greater PFC HbO changes were observed during the explicit task compared to the implicit task.
  • While HbO changes decreased between sessions, the distinction between implicit and explicit task activation remained consistent at the group level.

Conclusions:

  • The PFC plays a specific role in facial expression recognition, with differential involvement in implicit and explicit processing.
  • Changes in PFC oxyhemoglobin (HbO) can reliably capture these differential roles at the group level.
  • fNIRS is a promising tool for exploring the neural mechanisms of facial emotion recognition, despite limitations in individual reliability.