First of all, we were talking about "spoilerons" not ailerons. Spoilerons are on the upper surface of the wing and sometimes have the dual purpose of roll control augmentation and drag production.
If they came up at the same time, it is possible that they are just spoilers. In that case they are either being checked (I don't know if there is a seperate control for this in the Dash 8) or perhaps they are tied to a microswitch in the power lever quadrant. Maybe when they go into ground idle or reverse the spoilers are deploying? This would happen while taxiing into position because reverse/ground idle is the primary means of stopping or slowing a turboprop, not the bakes.
I'm glad you've learned something Muppet! I thought you Super-Pile drivers were beyond hope!