Patrick J. Gannon|Nancy Kheck|Allen Braun|Ralph L. Holloway
Planum parietale of chimpanzees and orangutans: A comparative resonance of human?like planum temporale asymmetry
Icahn School of Medicine at Mount Sinai|Icahn School of Medicine at Mount Sinai|National Institute on Deafness and Other Communication Disorders|National Institutes of Health|Columbia University
abstract previously demonstrated leftward asymmetry planum temporale pt brain language area unique humans since similar condition present great apes report related area great apes planum parietale pp pp humans rightward asymmetry correlation lgtr pt indicates functional independence roles pt human language well known pp implicated dyslexia communication disorders since posterior bifurcation sylvian fissure sf unique humans great apes used determine characteristics posterior ascending ramus indicator pp chimpanzee orangutan brains results showed humanlike pattern rgtl pp p 004 chimpanzees nonsignificant negative correlation lgtr pt vs rgtl pp cc 03 p 039 orangutans sf anatomy variable although pp nonsignificantly rgtl three four brains p 017 demonstrated humanlike hemispheric asymmetry second languagerelated brain area great apes findings persuasively support argument addition new component comparative neuroanatomic complex defines brain language polymodal communication areas pp strengthens evolutionary links living great apes may offer better understand origins progressive parts brain evidence mounts stable expression neural foundation language species recently shared common ancestor 2005 wileyliss inc