Enhancing Presence in Head-mounted Display Environments by Visual Body Feedback Using Head-mounted Cameras (eMagin Z800)

I Guess Oculus had to buy Nimble as the "Presence of Hands" increases subjects sense of "Presence" by 19%.  But the Presence of hands does not reduce, at least in this study susceptibility to Motion Sickness, so if Oculus thinks "Hands" are the Magic Bullet they better start buying more companies.

"No subject showed strong symptoms of simulator sickness. There was
no significant difference in the sensitivity to simulator
sickness between both conditions."

http://www.mcm.uni-wuerzburg.de/fileadmin/06110000/user_upload/Paper/IMG/2009/BSRH09.pdf