The theory of Ammons (1954) in conjunction with that of Ammons, Ulrich, and Ammons (1959) is that practice (perceptual learning) in reversing Necker cubes reduces the latency of form recognition. If true, reversal rates of a highly incomplete outline of a Necker should be significantly increased by practice on more complete outlines of cubes. In order of observation, practice in reversing on 15, 25, 50, 100, and 15% outlines of a Necker yielded a reversal rate on the last 15% cube nearly equal to that of the 100% cube. The theory remained tenable.
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