A track of fibers connects Broca's area with the POT area. Wilkins and Wakefield assert that these parts of the brain could have supported language skills even though they actually developed for other purposes. This leads to another controversial finding. Some experts argue that language evolved gradually from simpler forms of communication. Apes have different calls for various types of danger.
Linguists doubt it.
They say that the supporting brain structures evolved gradually, according to Darwinian principles. Language researchers largely have avoided the issue of its evolution, or have pursued unproductive lines of inquiry. Many linguists have not pursued questions of evolution because they appreciate the complexity of language. It seems much easier for people in other fields to pursue it because they don't have to adhere to what linguists would say has to be the case about brain-language relationships. Wilkins notes that discussions about language evolution, like those about evolution in general, can become quite heated.