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These experiments attempt to explore the mechanics of the minute factors which govern the deployment of attention—a matter of central importance in analytic theory. For example: A Necker Cube is a line drawing of a three dimensional cube which can be modified in such a way that an observer will tend to see the cube as facing at an angle to the left and up, or to the right and down. A balanced cube is drawn with all lines equally black so that it is as easily seen facing left as right. If one presents to an observer the pictures of the modified cubes alternately with the balanced cube and if one says things like: 'that's fine', 'good,' and 'Uh huh', while at the same time presenting the left-facing cube, the observer will also, and increasingly, tend to see the balanced cube as facing to the left. The intriguing finding is that if one repeats the procedure as before, but shows the balanced cube for only .001 second, there is much less tendency to guess that the balanced cube faces left. The brief exposure permits no scanning movements (attending to first one face of the cube and then another), whereas the longer exposures do. Thus, when the stimulus lends itself to skewing, the scanning movements tend to repeat the paths followed during the exposure to the modified picture. In other words, the plausible conclusion is that when the words of encouragement work (i.e., when they reenforce a particular perception) they appear to facilitate pathways which are used in paying attention to the stimulus; when these pathways serve no purpose (because of the brief exposure) and presumably are not used, the rewards have little effect.