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The cognitive constraints that humans exhibit in their social interactionshave been extensively studied by anthropologists, who have highlighted theirregularities across different types of social networks. We postulate thatsimilar regularities can be found in other cognitive processes, such as thoseinvolving language production. In order to provide preliminary evidence forthis claim, we analyse a dataset containing tweets of a heterogeneous group ofTwitter users (regular users and professional writers). Leveraging amethodology similar to the one used to uncover the well-established socialcognitive constraints, we find that a concentric layered structure (which wecall ego network of words, in analogy to the ego network of socialrelationships) very well captures how individuals organise the words they use.The size of the layers in this structure regularly grows (approximately 2-3times with respect to the previous one) when moving outwards, and the twopenultimate external layers consistently account for approximately 60% and 30%of the used words (the outermost layer contains 100% of the words),irrespective of the number of the total number of layers of the user.

Structural invariants in individuals language use: the "ego network" of words