This style focuses on one particular, rather than on a theme that gets developed, and the worshipper enters into the richness of savouring that one in particular. The focus may be Jesus, or holiness and so on. By repeating the word or thought the worshipper enters a personal, and often physical, experience. The differences of emphasis can often be observed externally. Presbyterians have tended to enter into meditative worship more than contemplative.
Meditation is usually an inner work focussing on brain activity and so outwardly is less expressive.
It then moves beyond to stand with low inward groaning or in silent awe of a God who is as high above us as the heavens are above the earth. I suspect, this is what the great French Christian philosopher Pascal meant when he said the heart has reasons that reason knows not of. Contemplation hasn't the same desire or drive to understand. It desires simply to experience the divine. It enters in with the whole heart and body, sometimes raising hands towards heaven, or dancing in wild abandon, or calling out, or swooning, sometimes enraptured almost unable to move, sometimes convulsing with ecstasy, sometimes seeing visions or vivid images.