  Language expression is known to be dependent on attributes intrinsic to the
author. To date, however, little attention has been devoted to the effect of
interfaces used to articulate language on its expression. Here we study a large
corpus of text written using different input devices and show that writers
unconsciously prefer different letters depending on the interplay between their
individual traits (e.g., hand laterality and injuries) and the layout of
keyboards. Our results show, for the first time, how the interplay between
technology and its users modifies language expression.
