Our brains are capable of perceiving and processing far more information at a far greater rate than our conscious minds can track. By presenting pairs of abstract images very quickly, the PD taps into this capability.

This quick, forced-choice situation requires an intuitive decision, engaging the right-brain processing of imagery, symbolism, patterns and holistic understanding and perception. The displaying of the image pairs is brief enough that the left-brain, analytical and judgment processes are bypassed.

A complete PD session generates epitomizing and antithetical pictures for the topics being assessed. The PD pictures, abstract and evocative as they are, act as an alogical amplifier, amplifying the sometimes ineffable perceptions that transcend logical thought and evaluation processes.