All the senses can trigger memories. You know how - even without trying - a sound, image or even a scent can conjure something from the deeper recesses of memory. There is not yet a device for readily generating different scents but I can expose you to random sounds and images. Anyone of these might trigger something or nothing at all. You might wish to refer to a selection of these prior to embarking on a meditation or just to break up the passage through the numbered phases.
Re-visit the stimulation pages from time to time. They will vary.
Just click on the image when you are ready to move on to the next.