Amasios Somatic Markertheory, part 1

Damasio writes, If an emotion is a collection of changes in body state connected to particular mental images that have activated a specific brain system, the essence of feeling an emotion is the experience of such changes in juxtaposition to the mental images that initiated the cycle(145). This is a complex idea. What does this quote mean? If you dont know, what do you think it could mean? Try to illustrate it with a simple example.