Good perception is something all riders need to add to their skill set AND practice often so not to get caught in a trap of complacency. Here is a brief article based on past seminars I have run that includes a bit of info on a couple of visual perception traps: motion induced blindness and inattentional blindness.
http://www.ride-ct.com/?p=3726
http://www.ride-ct.com/?p=3726