Side Stick Priority Lights
The Arrow Light illuminates red in front of pilot losing authority. Extinguishes when side stick activation is re-established by Captain or First Officer Light
The CAPT or F/O Light illuminates green to indicate associated side stick has established priority by activation of its priority switch, and the opposite side stick is not in neutral.
On newer airplanes, both lights flash when both side sticks are moved simultaneously and neither has taken priority. Extinguishes when the opposite side stick is returned to neutral.