I remember memorizing the photosynthesis and Krebb cycles while in college. I knew one of them would be on the exam so I drew them over and over, to save paper I drew photo. on one side of the paper and Krebb on the back. I got an odd look from the proff during the exam because it was the Krebb cycle and I couldn't start drawing it until I had mimed reaching out and turning over the imaginary paper that it was mentally printed on.
Apparently I have a visual memory.