re innateness don churma write elephant too big one blind man figure alone probably true especially blind man probably keep our hand firmly contact beast anyway means heart warning michael studdert kennedy s characteristic motor system evolve locomotion predation consumption mate match perceptual system evolve guide animan activity selection pressure shape each species perceptuomotor capacity first instance physical property world contrast perceptuomotor capacity themselve must play crucial role form social species communication system certainly specialize neuroanatomical signal device often evolve typically modify preexist structure enough perform function without appreciable loss old language evolve within constraint preexist perceptual motor system surrender much our power understand evolution disregard property those system indeed universal set linguistic feature owe nothing nonlinguistic capacity talker listener biological origin must due quantal evolutionary jump structure produce mutation while modern biologist favorably evolutionary discontinuity darwin justify accept discontinuity until rule continity contrary primacy linguistic form cardinal untest assumption modern phonology result phonology sustain grand isolation surround discipline sherman wilcox dept linguistic university mexico 