Shape vs. Color
Thu, Jan 17, 2008
It looks like the area which is able to process color is a very tightly packed spot in the retina. Almost all the photoreceptors that discriminate colors of light are in this area, the fovea. We don't perceive this narrow point of high resolution because the constant movement and scanning to a point of focus creates a process of active vision. A distinct shape which draws focus would seem to complement a strong color choice.
I found it amusing that both sources were so adamant that one was more effective than the other without quoting the basis of their statement. I'm sure the context of the visual stimuli would affect whether shape or color were processed first. Both shape and color seem to have importance and complement each other so I'm sure one would never negate one for the other.