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No. 103: Jan-Feb 1996

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Seeing Is Feeling

It's all done with mirrors! By properly positioning a mirror, an arm amputee can see the image of his flesh-and-blood limb appearing where his lost limb would normally be -- in a sense visually resurrecting the lost limb. In this way, scientists can explore the effects of vision upon the multitude of very strange "phantom-limb" phenomena reported by amputees. V.S. Ramachandran et al have described some of their findings in Nature.

"Nine arm amputees were studied. A tall mirror was placed vertically on the table, perpendicular to the patient's chest, so that he could see the mirror reflection of his normal hand 'superimposed' on the phantom. In the first seven patients, when the normal hand was moved so that the phantom was visually perceived to move in the mirror, it was also 'felt' to move; that is, a vivid kinaesthetic sensation emerged. (These sensations could not be evoked with the eyes closed.) In patient D.S., kinaesthetic sensations were evoked even though he had not experienced movements in the phantom for the preceding 10 years."

Several patients that experienced pain in their phantom limbs (pain that can be excruciating) found that the pain disappeared when they could "see" their phantom limb in the mirror. Those who complained of the so-called "clenching spasms" in their phantom hands (compared to fingernails digging into the phantom) found the spasms eliminated upon "seeing" their phantom hands.

In some patients, touching the normal hand evoked touch sensations at the same spot on the phantom hand. In others, though, the amputees felt nothing unless the phantom hand was also seen to be "touched" simultaneously. Even more curious, although the sensations of touch and vibration can be "transferred" from real limbs to phantom limbs, the senses of pain, heat, and cold cannot!

(Ramachandran, V.S., et al; "Touching the Phantom Limb," Nature, 377:489, 1995)

From Science Frontiers #103, JAN-FEB 1996. 1996-2000 William R. Corliss

Science Frontiers Sourcebook Project Reviewed in:

Quotes

  • "A sourcebook of unexplained phenomena is therefore a valuable addition to a collection of scientific literature. William R. Corliss has provided this in the past with his source books of scientific anomalies in several subjects, and now he has provided it for astronomy. He has done an excellent job of collecting and editing a large amount of material, taken in part from scientific journals and in part from scientific reporting in the popular or semi-scientific press." -- "The Mysterious Universe: A Handbook of Astronomical Anomalies", reviwed by Thomas Gold, Cornell University, in Icarus, vol.41, 1980

  • "An interesting, systematic presentation of unusual weather [..] This book is recommended for a general audience" --"Corliss, William R., Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena, Sourcebook Project, 1983.", revieweed in Choice, September 1983
  • "..the science is necessarily somewhat speculative, but Corliss's symthesis is based on reputable sources." -- "Corliss, William R. (Compiler). Lightning, Auroras, Nocturnal Lights, and Related Luminous Phenomena" reviwed by Joseph M. Moran, Univ. of Wisconsin in Science Books and Films, Sep/Oct 1983

  • "Before opening the book, I set certain standards that a volume which treads into dangerous grounds grounds like this must meet. The author scrupulously met, or even exceeded those standards. Each phenomenon is exhaustively documented, with references to scientific journals [..] and extensive quotations" -- "Book Review: The moon and planets: a catalog of astronomical anomalies", The Sourcebook Project, 1985., Corliss, W. R., Journal of the Royal Astronomical Society of Canada, Vol. 81, no. 1 (1987), p. 24., 02/1987