“New Finding Has Implications For Scientists Designing New Mobile Audio Interfaces”

People who carry on conversations with text-to-speech (TTS)
computer systems modify their speech patterns so they are more in
keeping with the computer’s mode of discourse, a technique known
as speech convergence, concludes a new study led by Sharon Oviatt …
http://www.acm.org/technews/articles/2003-5/0627f.html#item10