Also the fact that children, when learning a language, often and quite suddenly begin to apply rules they have learned to new phrases such as saying "I've drinken all my drink" after learning "I've eaten all my food". This is usually without being taught these rules first and as such demonstrate a key role of cognition in terms of learning. This principal is further illustrated by study conducted by Park, H. I., & Ziegler, N. (2014). Their study illustrates that overall, Cross-linguistics show a connection between language and our ability to conceptualize concepts. Linguistics influence an individual's mind from a very early age. A lot of attention has been given to the topic of bilingual cognition research due to the fact that speaking multiple languages changes the way environments are evaluated. Ukrainian-American linguist Aneta Pavlenko defines "coexistence" as the tendency of those who speak multiple languages to create and maintain cognitive patterns that are specific to each language. Sachs and Coley provided evidence for this phenomenon in 2006 through their investigation of Russian–English bilinguals’ emotional understanding. Their results showed that multilingual people explain the difference between jealousy and envy differently depending on which language the question is asked in, lending credence to the idea of coexistence.