I really had a problem with this during my first year of cycling. Didn't matter what it was...a rock, a pinecone, a piece of garbage...if I tried to avoid it, I'd run over it. Every time. My cyclist friend said I had a bad case of Object Fixation. Luckily, I'm now enjoying my third season of cycling and I am proud to say I have developed the ability to avoid objects and hazards in the road (most of the time ).