Group 1 participants were given visual search pattern training that consisted of instructing the participant to use only their eyes to follow a series of solid and dashed lines printed on a piece of standard copy paper, in a left to right, top to bottom manner, similar to reading a book. First, the participant was given the a piece of copy paper with horizontal solid lines printed the width of the page, with 1” margins on the right and left
of the page to allow a uniform background for trailing and preceding movements in edge detection techniques.