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Compact Colocated Bimodal EEG/fNIRS Multi-Distance Sensor.

Frédéric Hameau1, Anne Planat-Chrétien1, Sadok Gharbi1

  • 1University Grenoble Alpes, CEA, Leti, F-38000 Grenoble, France.

Sensors (Basel, Switzerland)
|September 13, 2025
PubMed
Summary
This summary is machine-generated.

Measuring brain activity outside the lab is challenging. This study introduces a novel bimodal electroencephalography-functional near-infrared spectroscopy (EEG-fNIRS) sensor for robust, portable brain signal acquisition.

Keywords:
EEGbimodal acquisition systemfNIRSreal environmentwearable

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Signal Processing

Background:

  • Current portable brain signal measurement systems lack robustness, comfort, and ease of use, limiting lab-free applications.
  • Simultaneous acquisition of electrical and hemodynamic brain activity is crucial for comprehensive neuroimaging.
  • Existing methods struggle with accurate signal estimation and correction of artifacts in real-world settings.

Purpose of the Study:

  • To develop and validate a novel bimodal electroencephalography-functional near-infrared spectroscopy (EEG-fNIRS) sensor system.
  • To enable robust, synchronized measurement of colocated electrical and hemodynamic brain activity outside laboratory environments.
  • To address the limitations of current portable neuroimaging technologies.

Main Methods:

  • Designed a unique sensor geometry for simultaneous EEG and fNIRS acquisition.
  • Implemented technical solutions for synchronized 250 Hz signal output without crosstalk.
  • Incorporated short-channel distance for extra-cerebral activity correction and spatially resolved spectroscopy (SRS) gradient computation.

Main Results:

  • The proposed bimodal EEG-fNIRS sensor successfully acquired synchronized brain signals at 250 Hz.
  • The system demonstrated robustness and lack of crosstalk between modalities.
  • System performance was validated using an N-Back mental workload protocol.

Conclusions:

  • The developed bimodal EEG-fNIRS sensor offers a robust and portable solution for lab-free brain activity measurement.
  • The unique spatial geometry facilitates accurate estimation of colocated electrical and hemodynamic signals.
  • This technology advances the potential for real-world neuroimaging applications.