Figure 10

The perceptual distinctiveness manipulation. The perceptual distinctiveness of the colors was manipulated at three levels. (a) The full rich colors of red and blue stimuli (ellipse, rectangle) in the easy distinctiveness condition. (b) The colors of red and blue stimuli (ellipse, rectangle) in the intermediate distinctiveness condition. (c) The pale, nearly gray colors of red and blue stimuli (ellipse, rectangle) in the hard distinctiveness condition.