phantom of the cortex
The phenomenon known as the phantom limb is very intriguing in the world of neurology. It has been, and continues to be heavily debated among scientists as to the causes of these phantom sensations and phantom pains. Amputee victims have an 80-90% likelihood of experiencing the phantom limb (Sidebotham, 1996). The sensations of pain consist of stabbing, cramping, burning, and shooting pains (Sidebotham, 1996). Although these irritations are common and often progressive, research has undergone many steps in discovering treatments for the pain. Unfortunately the phantom pain is not like chicken pox, but more like arbitrary occurrences. It can arise right after amputation or even years later. What happens is the patient feels sensations where the arm or leg used to be as if it were still present (Price, 2002). To add to the irritability of the phantom limb, not all sensations are of pain. Some are recognizable as if their limb were still there and accompanied by all its sensations; warmth, tingling, itching, and movement (Sidebotham, 1996). These non-painful sensations are the ones that usually occur soon after the amputation and continue throughout life. Research has found that the phantom limb tar
In "Pain: an Overview," the author fervently agrees with the theories of Ronald Melzack. Since the limb is not there, and the brain receives no sensory feedback, it will increase the strength of the impulse. The experiment Pons deals with plasticity in the primary sensory cortex, but to a larger degree he studies the involvement of the thalamus (Jones, 1998). Melzack suggests that a large number of interconnected neurons, what he terms a neuromatirx, exists in every person. In contrast to Pons' thinking, he does not think that the brain sprouts new neurons because the remapping can occur in times less than a month or two. Coming back to the homunculus, it is known as "little man. Having grasped the attention of animal rights activists, the experiment was halted and the macaques were held off-limits to research. Take for example the action of pressing a key on your keyboard. Vilayanur Ramachandran constitutes a theory that stems from the works of Timothy Pons. An amputation stops activity in that area of the homunculus, which allows hidden neural circuits (laying in wait for this opportunity) to become activated and link other areas of the body through that supposedly inert section of the humunculus (Price, 2002). The intensity of this sensation, or electrical impulse, is dependant on the density of the touch receptors in the body part, and not by the actual size. This has allowed considerable research to be conducted giving insight into a condition far from ordinary. In contrast to Melzack's analysis Ramachandran speculates that a hidden circuitry exists in the brain to explain phantom pain. " Furthermore, the neurosignature emphasizes that each body part attached to this "self" is your own and not someone else's. Therefore phantom pain takes place.
Common topics in this essay:
Pathways Plasticity,
Ronald Melzack,
Phantom Cortex,
Vilayanur Ramachandran,
Edward Taub,
Using Q-Tips,
Civil War,
Silver Spring,
Timothy Pons,
phantom limb,
Melzack Ramachandran,
timothy pons,
melzack 1999,
somatosensory cortex,
sensory cortex,
sidebotham 1996,
mcveigh 2000,
primary sensory cortex,
primary sensory,
ronald melzack,
vilayanur ramachandran,
silver spring monkeys,
phantom limb sensations,
sense physical self,
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Acceptance Essays
