Kirk,  I am convinced that turkeys absolutely can pick up bright colors,  even if only the one on your bow.  When I first started trying to hunt turkeys without a blind I used bright fletch and kept getting busted everytime they got close.  I use flo. orange for all my hunting except turkeys.   For those,  it's natural barred or natural colors only.  It does seem to have helped.

I know that Joebuck is so concerned about turkeys sight that he colors his steel broadheads with a black magic maker.  They have excellent vision!  

That being said,  I have had turkeys walk right by me during deer gun season while wear blaze orange and they never even looked my way.  Go figure.

White crest dip or reflective arrow wraps with white, yellow or chartreuse feathers and yellow or chartreuse nock is what I prefer for practice or hunting.  I like to see the arrow and spot where I hit on target. Also good if you don't have perfect vision like me.

Yes, birds see color. Why do you think the males are so brightly colored?

Fluorescent yellow for me...I'm colorblind and they stand out compared to other colors. I defiantly think it helps to train your brain during practice as well as determining a hit on a animal...especially in low light.

The bright colors show me how far I am from where I was aiming.