Recumbent Exercise Bicycle

I have a recumbent trike (an ActionBent Tadpole) and the right front wheel makes noise like there was a playing card hitting the spokes. I thought it was the brake making contact on the disc brake, but I don’t think so now after playing with the brake. It increases in volume when I’m turning left and decreases/silences when I’m pulling right. What is the cause of this?
Well, thanks for answers! Unfortunately, I won’t be needing them right now. I wrecked the trike yesterday on the way home (due to my own carelessness, not any lack of safety of the trike or trikes in general). Anyways, I landed pretty hard on that wheel as I rolled around, so the earlier noise isn’t going to be an issue. Unfortunately, leaving me without a ride for Ride Your Bike To Work Day today, but…