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A stimulus impinging on the mind can be conceived as behaving like a"... raindrop land [ing] on a terrain of hills and valleys. The drop moves generally downhill until it ends up at the bottom of a nearby valley. The deeper the memory basin and the steeper the walls, the more likely the train of associations is likely to end up in it. In PTSD [Post Traumatic Stress Disorder] the traumatic event may be conceptualized as occupying... a Dead Sea of memory, into which all too many of the patient's associations inexorably flow"(Tank and Hopfield, 1987, p. 106).