SOPS.
From the 787 FCOM, Flight Controls:
Gust Suppression.
Vertical gust suppression enhances ride quality in the presence of vertical gusts and turbulence. It utilizes symmetric deflection of the flaperons and elevators to alleviate gust acceleration. This function is active only with the autopilot engaged in Altitude Hold or VNAV level flight modes.
Lateral gust suppression improves ride quality and can reduce pilot work load on approach by automatic application of discrete yaw commands in response to lateral gusts and turbulence.
Operation of vertical and lateral gust suppression does not result in control wheel, control column, or rudder pedal movement.