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Evidence of a Nonlinear Human Magnetic Sense

Evidence of a Nonlinear Human Magnetic Sense. Simona Carrubba and Andrew Marino Louisiana State University Health Sciences Center Department of Orthopaedic Surgery Shreveport, LA. Summary. Model for detecting EMFs? Sensory transduction Evoked potentials (EPs) Nonlinear magnetosensory EPs.

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Evidence of a Nonlinear Human Magnetic Sense

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  1. Evidence of a Nonlinear Human Magnetic Sense Simona Carrubba and Andrew Marino Louisiana State University Health Sciences Center Department of Orthopaedic Surgery Shreveport, LA

  2. Summary • Model for detecting EMFs? • Sensory transduction • Evoked potentials (EPs) • Nonlinear magnetosensory EPs

  3. How Should the EMF Interaction Be Modeled? Proposed theories • • • Sensory perception * * Becker & Marino: Electromagnetism & Life, 1980. Marino: Bioelectrochem., 1993. Sonnier & Marino: Electro - & Magnetobiology, 2001. Marino et al.: Clin. Neurophysiol., 2004.

  4. Sensory Transduction Hypothesis Brain Afferent Signal Sensory Cell Odorant molecule EMF

  5. Experimental Rationale All known sensory stimuli Onset (Off-On transition) Offset (On-Off transition) Latency ~ 50-500 ms Evoked Potentials If magnetic field is sensed Evoked potential

  6. Our Definition of Nonlinearity* X(t): Sensory stimulus (applied N times) S X(t) Y(t) Increase (N) X-Y is LINEAR Decrease X-Y is NONLINEAR Snoise(N) *Marino et al, BEMS, 2001 - Marino et al, BEMS, 2003

  7. Homogeneity of Magnetic Field(2 gauss RMS, 60 Hz)

  8. Experimental Procedure

  9. Experimental Design N≥50 7-s trials Onset epoch (0.03-1 s) Offset epoch (2.03-3 s) Control epoch (5.03-6 s) Linear analysis: V(t) Nonlinear Analysis: V(t) %R(t)

  10. Recurrence Quantification Analysis* * Carrubba et al.: J. Neurosci. Methods, 2006 (in press)

  11. Effect of Field-Onset on EEG Time Series

  12. Effect of Field-Onset on%R(t) Time Series

  13. Effect of Field-Onset on%R(t) Time Series

  14. Detection of Magnetic Fields

  15. Effect of Field Onset on %R

  16. Effect of Field Offset on %R

  17. Evidence of Nonlinear Characteristics ofMagnetosensory Evoked Potentials

  18. Summary of Results

  19. Conclusion • Human Magnetic Sense • Nonlinear

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