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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Related Experiment Video

Updated: Jun 18, 2026

Conducting Hyperscanning Experiments with Functional Near-Infrared Spectroscopy
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Low coherence interferometer for sensing retardance change during neural activity.

Muhammad K Al-Kaisi1, David Landowne, Taner Akkin

  • 1Department of Biomedical Engineering, University of Minnesota, Twin Cities, MN 55455, USA. alkai002@umn.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|December 8, 2009
PubMed
Summary

Researchers developed a sensitive differential phase technique to optically measure action potential propagation in nerves. This new method detects transient retardance changes, offering a non-contact approach for studying neural activity.

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Area of Science:

  • Biophysics
  • Neuroscience
  • Optical Engineering

Background:

  • Optical measurements reveal transient changes during action potential propagation.
  • Improved techniques are needed to better understand these neural optical phenomena.

Purpose of the Study:

  • To propose a novel differential phase technique for detecting transient retardance changes in stimulated nerves.
  • To achieve a sensitive, non-contact optical measurement of action potential propagation.

Main Methods:

  • Utilized a polarization-maintaining fiber interferometer.
  • Employed two orthogonal polarization channels for differential phase detection.
  • Focused on measuring retardance/birefringence changes.

Main Results:

  • Achieved a system sensitivity of 10.4 picometers (pm).
  • Demonstrated the potential for non-contact optical measurement in reflection mode.

Conclusions:

  • The developed differential phase technique shows promise for studying neural activity.
  • This method can advance the understanding of transient retardance changes during action potential propagation.