Many humans can unconsciously detect changes in Earth-strength magnetic fields, according to researchers at Caltech and the University of Tokyo.
The study, guide by neuroscientist Shin Shimojo and geoscientist Joseph Kirschvink (BS, MS '75) at Caltech just as neuro engineer Ayu Matani at the University of Tokyo, offers test proof that human brain waves react to controlled changes in Earth-strength magnetic fields. Kirschvink and Shimojo state this is the principal solid proof of another human sense: magnetoreception. Their findings were distributed by the diary eNeuro on March 18.
"Many creatures have magnetoreception, so why not us?" asks Connie Wang, Caltech graduate understudy and lead creator of the eNeuro examine. For instance, bumble bees, salmon, turtles, winged creatures, whales, and bats utilize the geomagnetic field to enable them to explore, and mutts can be trained to find covered magnets. It has for quite some time been estimated that humans may share a comparable capacity. Be that as it may, in spite of a whirlwind of research attempting to test for it in the '80s, it has never been conclusively demonstrated.
"Aristotle delineated the five basic resources as including, hearing, smell, vision, taste, and touch," said by Kirschvink. The co-corresponding maker of the e-Neuro study and Nico and Marilyn Van Wingen Professor of Geobiology. "In any case, he didn't think about gravity, temperature, pain, balance, and several other internal stimuli that we currently know are a piece of the human sensory system. Our creature family line contends that geomagnetic field sensors ought to likewise be there representing not the intuition but rather maybe the tenth or eleventh human sense to be found."
To attempt to determine whether humans do detect magnetic fields, Kirschvink and Shimojo manufactured a separated radiofrequency-protected chamber and had members sit peacefully and express dimness for 60 minutes. During that time, they moved the magnetic field quietly around the load and estimated members' brain waves through anodes situated at 64 areas on their heads.
The test was performed with 34 human members from a wide age run and an assortment of ethnicities. During a given session, the members intentionally experienced nothing more interesting than sitting alone in obscurity. Be that as it may, among many members, changes in their brain waves connected with changes in the magnetic field around them. In particular, the specialists followed the alpha cadence in the brain, which happens at somewhere in the range of 8 and 13 Hertz and is a proportion of whether the brain is being locked in or is in a resting or "autopilot" mode. At the point when a human brain is unengaged, the alpha power is high. When something grabs its eye, deliberately or unconsciously, it is alpha power drops. Several other tactile stimuli like vision, hearing, and touch are known to cause unexpected drops in the sufficiency of alpha waves in an initial couple of moments after the improvement.

Reference:
https://jacobspublishers.com/jacobs-journal-of-neurology-and-neuroscienceissn-2376-9408/