![blue light banner effect on men blue light banner effect on men](https://images.freeimages.com/images/large-previews/bff/light-effects-1197152.jpg)
To establish the existence and underlying mechanism of human magnetic sensing, we have studied magnetic orientation in men, which showed remarkable magnetic sensitivity, by combining the rotary chair method with a two-alternative forced choice (2-AFC) paradigm 33, 34, applying oscillating magnetic fields as a diagnostic tool for a magnetic field resonance mechanism, such as the radical pair mechanism 35.ĭifferential sensitivity in ambient GMF-responsive orientation However, so far, the existence of a human magnetic sense itself and any underlying mechanism are far from clear. The observed sensitivity to the polarity of the applied magnetic fields implied a magnetite-based mechanism.
![blue light banner effect on men blue light banner effect on men](https://i.pinimg.com/originals/96/15/c9/9615c9d321948a5692932203631b9c45.jpg)
In contrast, electroencephalography showed that a decrease in alpha brain wave activity occurred in some human subjects under conditions of darkness 32. This study suggests that the magnetoreceptors are in the eyes but does not demonstrate the underlying sensory mechanism. In a rotary chair experiment, starved men but not women were able to orient in a blue-light-dependent manner towards a particular magnetic direction that had previously been associated with food in the ambient GMF 31. Following previous controversial reports 28, 29, 30, two recent studies, using different experimental approaches, support the existence of GMF responses in humans 31, 32 with a sharp contrast. It is widely accepted that the Earth’s static magnetic field is not sensed by humans, while alternating magnetic fields, such as power frequency fields 26 and pulsed fields 27, can have adverse health effects and therapeutic applications, respectively. Research on magnetoreception in humans is very limited. In these species, the inclination compass is activated by blue or green light 24 and disrupted by red light 25, indicating that different wavelengths play different roles in radical pair-mediated behaviors 21. It is thought that light-induced radical pairs, comprised of a flavin adenine dinucleotide (FAD) radical and a tryptophan radical, in cryptochromes act as the magnetic compass sensor in migratory birds through a quantum mechanical mechanism 20, 21, 23. An inclination 12, 16 or polarity compass 17, 18 may provide animals with directional information by contrasting mechanisms: light-dependent radical pairs 19, 20, 21 in cryptochrome flavoproteins in the eyes of birds 20, 21 and light-independent iron-containing biogenic magnetite in bacteria or the ethmoid bone of salmon 14, 22. Both magnetic compass 2, 12 and magnetic map 3, 13 information can be derived from the GMF the former being essential for a variety of magnetically sensitive behaviors 5, 6, 7, 8, 9, 10, 12, 14, 15. Numerous organisms, across a wide range of taxa, including birds, sea turtles, reptiles, insects, magnetotactic bacteria, and plants, use the geomagnetic field (GMF) as a sensory cue for migration 1, 2, 3, 4, short-distance movement 5, 6, 7, body alignment 8, 9, 10, food search 6, 7, or growth (plants) 11, depending on the species and biological context. These results establish the existence of a human magnetic sense and suggest an underlying quantum mechanical magnetoreception mechanism. Furthermore, inversion of the vertical component of the geomagnetic field revealed a non-canonical inclination compass effect on the magnetic orientation. Importantly, it appears that a magnetic field resonance-dependent mechanism mediates these responses, as evidenced by disruption or augmentation of the ability to orient by radiofrequency magnetic fields at the Larmor frequency and the dependence of these effects on the angle between the radiofrequency and geomagnetic fields. Magnetic orientation of the subjects was sensitive to the wavelength of incident light and was critically dependent on blue light reaching the eyes. Two groups of subjects were classified with different magnetic orientation tendencies depending on the food context. Here, we demonstrate that a magnetic field resonance mechanism mediates light-dependent magnetic orientation in men, using a rotary chair experiment combined with a two-alternative forced choice paradigm. Despite some contradictory reports, yet it is generally accepted that humans do not sense the geomagnetic field.
![blue light banner effect on men blue light banner effect on men](https://thumbs.dreamstime.com/z/blue-vector-banner-set-lighting-elements-blue-lighting-banners-different-design-blue-vector-banner-set-lighting-127137347.jpg)
Numerous organisms use the Earth’s magnetic field as a sensory cue for migration, body alignment, or food search.