What the Hands Reveal About the Brain provides dramatic evidence that language is not limited to hearing and speech, that there are primary linguistic systems passed down from one generation of deaf people to the next, which have been forged into antonomous languages and are not derived front spoken languages.
All three authors are associated with the Salk Institute for Biological Studies in San Diego. Howard Poizner is Staff Scientist at the Institute's Laboratory for Language and Cognitive Studies. Edward S. Klima is Professor of Linguistics at the University of California, San Diego, and Adjunct Professor at the Salk Institute. Ursula Bellugi is Professor at the Salk Institute and Director of the Institute's Laboratory for Language and Cognitive Studies. Klima and Bellugi are the authors of The Signs of Language.