of ecological conditions. Henrich highlights the role of dual inheritance, which propels changes in language that persist across generations. It follows that slight differences in language patterns may be selected for because they are advantageous for individuals in the given environment. Biased transmission then occurs which allows for speech pattern to be adopted by members of the society. References External links What is the sonority scale? Lingua::Phonology::Syllable — Perl module for extracting sonority scale from text. https://glossary.sil.org/term/sonority-scale The Syllable and Phonotactic Constraints http://linguismstics.tumblr.com/post/16916697835/linguistics-sonority-hierarchy The Derivation of a Sonority Hierarchy from the Syllable Contact Law (SCL) and the Productivity of SCL in American English Dual inheritance theory#Biased transmission Phonotactics Phonology