What is the fine-grained topic of the following text: Undoubtedly, it is an extensive areal phenomenon, as a general rule, represented in Uralic languages the stronger the more eastern, closer ones to Paleosiberian languages we have in mind (reference to the person of an object in verbal forms occurs also in Basque, some Caucasian languages and Amerindian languages--see Tauli 1966 : 169). Only return the topic.
Uralic languages and their relation to Paleosiberian, Caucasian, and Amerindian languages.