Do genes cause a preferance for tonal or non tonal languages? Possibly. Researchers have discovered ASPM and microcephalin, two genes that are linked to brain growth, may cause a preference for tonal languages.
An article about researchers recording results after a patient regained his sight after being blind his whole life and how he reacts to the "new world"
An article about researchers recording results after a patient regained his sight after being blind his whole life and how he reacts to the "new world"
In this article, they discuss the different strategies researches have been debating about using to communicate with uncontacted tribes. They discuss using certain handmotions and signals to show that they are friendly and others ways of communicating without posing any threat or danger.