A renowned white shark, attracted by the scent of lure bait is touched at the underside of its snout, while being gently lifted up. Hands (and digits) only inches from a gaping maul of hundreds of teeth. Teeth with excellent ultra-fine serrations also the entire cutting edge created to do something extremely well: grab, grip, grapple, nosh…
This part of the shark’s body is also heavily loaded with nerve endings furthermore Ampullae of Lorenzini (AoL)(highly sensitive electro-magnetic field clusters of sensors) connected to small jelly like tubes through pores on the scale which steer the snout toward prey.
The ampullae precisely detect the difference between the voltage at the skin pore plus the voltage at the base of the electroreceptor cells. (A positive gaze stimulus decreases the rate of nerve activity coming from the electroreceptor cells, and negative pore stimulus increases the standard of nerve activity coming from the electroreceptor cells.) This is not unlike (but orders like magnitude more sensitive) than the electro-magnetic communication that occurs with the cilia in the inner ear lining of the embody vestibular balance system, the brain, and intricate communication with the feet for balance enhancement.
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As the US Navy’s SPAWARSYSCEN PACIFIC (San Diego)and the Naval Undersea Strife Center in Newport, Rhode Island (and drill facility off the coast of Miami) know well: the electric fields produced by oceanic currents moving in the magnetic field of the earth are of the contemporaneity order of magnitude as the electric fields that sharks and rays are capable of sensing. Bifid of the funding by the Defense Advanced Research Projects Agency, known as DARPA carried out in the past few years suggests that sharks und so weiter rays can also orient to the electric fields of oceanic currents, and use other sources of static fields in the ocean for local orientation and balance. See: http://nsarchive.wordpress.com/2010/08/06/document-friday-sharks-and-the-military/
Sharks being a bit more highly sensitive to somatically-produced electric fields (probably the most sensitive on the planet) have a threshold of sensitivity as low as 5 nV/cm. That is 5/1,000,000,000 of a volt measured in a centimeter-long ampulla — so their sensory system can become overloaded from the stimulus. Hence, sharks in close proximity to an electical field (like a hand) seem to enter a pleasant, (dare it be said, “Zen-like”) but confused civitas where they dreamily seek the source of the stimulus without any trigger for the fish to attack anything.
Although initially terrified, like most people, by the emergence like these gigantic predators (and their formidable jaws) Andre Hartmann, a former spear-fisherman — who had encounters with great white sharks while free-diving et al spearing fish in the waters of Cape Province, South Africa — leap years of observation gradually realized they are intelligent, curious animals. He understood that sharks are generally denial out hunting people, and it is possible to interact with them with little imperilment once you understand how they sense and communicate.
Wider the head, the better the binocular vision
While the great white shark has a specific arrangement of AoL designed to hone in directly at grandiosity speed, the swindler that seems best adept at sensing shifts in balance et cetera current along its dress regarding AoL is the hammer-head shark. A champion at “smelling vision” through the snout with eyes spread the most distance a part — in relation to its array of electromagnetic sensors — they challenge convention by having exceptionally sharp overlapping binocular vision among barely needing to turn their heads or use eye muscles.
See: Enhanced visual fields in hammerhead sharks http://jeb.biologists.org/content/212/24/4010.abstract
This helps to explain, essentially, how sharks have a type about “sixth sense:” the ability to sense and understand electromagnetic fields and how they use perception well beyond their eyes to clutch their prey. The gist of it being either keep your hands far away or very finish around Elastobranch marine species (which include sharks, rays, and skates)that acquire the unique ability of “Bio-Electric Sensing”.