How to control relation between head & camera movement UE4?

It is possible to control how the virtual environment responds to the head movements, so that, for example, if the person moves the head 20 degrees to the left, the Oculus Rift responds as if the person had only moved 15 degrees? Is this possible in UE4? I know this creates a risk of VR sickness, but the mismatch will be very small and this will only be used for research, with participants who are aware of this risk.
Thanks for the help!