@misc{cogprints866, editor = {Stevan Harnad and Horst Dieter Steklis and Jane B. Lancaster}, title = {From hand to mouth: Some critical stages in the evolution of language}, author = {Horst Dieter Steklis and Stevan Harnad}, publisher = {Annals of the New York Academy of Sciences 280}, year = {1976}, pages = {445--455}, journal = {Origins and Evolution of Language and Speech}, keywords = {language, evolution, lateralization, gesture, propositions, symbols, translatability, speech}, url = {http://cogprints.org/866/}, abstract = {A theory of the evolution of lanaguage, beginning with bipedalism and lateralization, through instrumental and iconic gesture, to arcbitrary symbols, propositions and speech. The "translatability thesis" is also introduced, to the effect that all languages are intertranslatable (hence all can express any and every proposition).} }