http://www.thenakedscientists.com/forum ... Bboardseen
The nervous system requires the constant pull of gravity in the correct direction through the shark’s body! Turing the shark, eel, crock, gator upside down sends the tiny pulses of salts that drive the spinal fluid in the wrong direction slowing and even shutting down the nervous system by compromising the circulation. Easily verifiable in a laboratory using barium or some other active substance to monitor circulation changes, but I guess its easier to carry on believing that gravity does nothing in the nervous system. Multiple Sclerosis has been shown to relate to high humidity in river valley areas and low laying coastal areas!
Catatonic state from reduced motor activity in humans and animals is not uncommon. Indeed sleep is a mild form of it, and sleep paralysis can be induced when the body position or posture of a person is incorrectly aligned with gravity. Placing a person who is catatonic in a compromising posture can cause that person to remain in the same position for very long periods. Oliver Sachs who the film Awakenings represented was faced with an unusually large number of people subject to catatonic state. This was believed to be caused by a form of encephalitis which causes inflammation of the brain. Yet as Sachs showed, the use of levodopamine (Ldopa) revived the patients temporarily before the onset of overdose caused severe malfunction in the nervous-system that was considered to be worse and more dangerous than the catatonic state.
I have written to Sachs on numerous occasions but I guess he is a very busy man, too busy to listen to someone who might just have found the common denominator in the sleepers who are in catatonic state. I believe that an increase in humidity can initiate the slowing down of the nervous system and suspect that high humidity was the cause of the encephalitis that led to the catatonic state, and indeed have related this to how dolphins and whales have to migrate in order to escape from very high humidity which significantly reduces their ability to outrun the trawlers nets and reduces their ability to stay under water and hunt for food. I also believe this is why pilot whales beach themselves and die while trying to avoid drowning. The humid air according to my own research would compromise the oxygenation capacity of the lungs and alter the flow of the cerebrospinal fluids by reducing the density changes caused by gas exchange from the respiratory tract.
Andrew K Fletcher
This video is not relating to the deep catatonic state induced by laying the shark on it’s back. But relates more to an enjoyable sensation that stupefies the recipient, in the sharks case the sensation is from gently stimulating the front of it’s mouth. In a bull terrier the same state can be induced by drawing a figure 8 continuously on the tummy. We use this method when showing dogs as it relaxes the dog and avoids any nervous reaction towards the judge or other exhibiters.
The bull terrier also massages it’s head under a tree, usually the Christmas tree or a large house plant. They go into ultra slow motion mode, it has us rolling the floor with laughter when they do this.
But again not the same reaction as turning a shark or gator on their back.
http://www.youtube.com/watch?v=CWKvyqrr ... re=related
this video is interesting. It shows a shark upside down reacting as a magnet is drawn near to its head, even when behind a plastic barrier.
Sleep induced paralysis is another interesting example, and something that affects my wife. She still has a the odd attack, but sleeping inclined has greatly reduced the onset from 4-5 times per night to once every 4-5 months
http://www.youtube.com/results?search_q ... type=&aq=f
IMMOBILITY IN FIVE SPECIES OF FIDDLER CRABS, GENUS UCA
Lauren Bergey and Judith S. Weis
Rutgers, The State University of New Jersey, Department of Biological Sciences, 101 Warren Street, Newark, New Jersey 07102, U.S.A. (corresponding author (LLB) firstname.lastname@example.org
; (JSW) jweis@email@example.com)
Fiddler crabs demonstrate a wide range of simple and complex behaviors in both mating strategies and defense mechanisms. During investigation, five species of fiddler crabs were observed engaging in immobility or catatonic behaviors after being turned upside down. While crabs were observed in a rigid, immobile posture for mean ranges of 45–171 seconds, several crabs were recorded to remain immobile for more than two hours. Fiddler crabs are often preyed upon by birds that use crab movement as a cue. Other crustacean species, such as lobsters, have been observed in this upside-down, immobile position after having their abdomens rubbed. Consequently, immobility may be an anti-predator strategy when escape is not feasible or a byproduct of tactile stimulation.
Defence or nervous system comprimised by posture?