"What came first?" He asked. "Changes in speech, or brain changes?"
Ray Jackendoff, a Tufts University lecturer who was not involved in the study, said the group's search said the ease of saying some sounds may differ in diet "is noteworthy but not earthshaking." Different cultures may have uttered some sounds more often than others "does not say much about deep language history."
Other cultural and social factors, such as adopting sound from neighbors, Contribute to language changes, said study authors. For example, when hunter-gatherer groups and agrarian groups are together, they are also sound .
Other linguists specialized indicate that the study relies on non-repetitive assumptions, such as how much can be affected by minor changes in this bite, the types of mistakes they can make, the age at which the hunters collect & # 39; dental wear, and the belief that agriculture is a useful proxy for diet. The role of the cognitive factors, including the neural control of speech organs, also goes unaddressed.
Authors reply not limiting the roles of culture, society or language developmental cognition. But they say that physical differences between people deserve a lot of attention in the study of human language development as they do in research on animal communication systems.
Some linguists are concerned that if it is not handled by extreme care, subsequent physical or biological studies of language differences can reinforce ethnocentric beliefs to enter into linguistics in the past, especially if research is publicly defined as making discretionary values of different languages.
"The danger here is a bias that focuses on positive benefits or is acquired by individuals in agrarian societies, rather than considering any benefits of individuals in hunter-gatherer society," said by Adam Albright, a MIT linguist