Although cerebral dominance, the specialization of each side of the
brain for different functions, was discovered in the 1860s, almost
nothing was known for many years about its biological foundations,
the study of which has undergone what can only be described as a
revolution in the past decade and a half.
Norman Geschwind and Albert Galaburda, two of the leaders of
this new field, have assembled a distinguished group of
investigators, each a pioneer in some aspect of the biology of
dominance. The authors document human brain asymmetry at gross and
microscopic levels in both adults and fetuses, its visualization in
life by radiological methods, and its manifestation in brain waves.
The evolutionary history of brain asymmetry over more than 300,000
years is shown in fossil skulls of humans and apes. In a dramatic
reversal of older beliefs, asymmetry of anatomy, function, and
chemistry has been demonstrated in many nonhuman species, and
experiments have shown the role of hormones and other prenatal
influences in the production of asymmetry. The surprising
associations of non-right-handedness with twinning and immune
disorders are discussed, as well as the asymmetrical malformation
of the cortex in childhood dyslexia.
This volume, combining scholarly authority and the excitement
of the birth of a new discipline, will be welcomed by those to whom
the implications of dominance are becoming
evident--neuroscientists, neurologists, linguists, psychologists,
experts in learning disorders, speech pathologists--and by
specialists in nearly every branch of biology, medicine, and
psychology.
General
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