DARPA is soliciting innovative research proposals in the area of natural communication with computers.
This program is a 6. 1 basic research effort that aims to accelerate progress toward two-way communication between people and computers in which the machine is more than merely a receiver of
commands and in which a full range of natural modes is tapped, including potentially language, gesture and facial or other expressions.
For further details see attached PDF, "DARPA-BAA-15-18 CwC"