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No. 42: Nov-Dec 1985

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Left-handers have larger interbrain connections

The two halves of the human brain are connected by a bundle of nerve fibers called the corpus callosum. The corpus callosum is thought to help integrate the activities of the right and left brains which, for reasons unknown, seem to specialize in different kinds of mental operations. Studies of the corpus callosum reveal that it is about 11% larger in left-handers than in right-handers. In terms of interconnecting nerve fibers this comes to 25,000,000 more for the left-handers. Just what sort of information flows along these myriad pathways is not known, although we do know that left-handers have greater bihemispheric representation of cognitive functions; i.e., the brain functions are not so specialized in each half of the brain. But why should left-handers and right-handers be different at all? Are they born with unequal corpus callosa? Or are these nerve highways equal are birth and atrophy in right-handers ? (Witelson, Sandra F.; "The Brain Connection: The Corpus Callosum is Larger in Left-Handers, " Science, 229:665, 1985. )

From Science Frontiers #42, NOV-DEC 1985. 1985-2000 William R. Corliss

Science Frontiers Sourcebook Project Reviewed in:


  • "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