Surprise is an interruption caused by information that doesn't fit with our current understanding or expectations, It causes us to reevaluate.
Surprise is a bridge between cognition and emotion. Surpirse is the shortest duraction emotion, rarely lasting more than a few seconds.
Brene Brown Atlas of the Heart p. 66
Surpirse is an amplifier. Once our thinking brain works out the unexpected thing that's happening, we move into emotion. There's evidence that surpise amplifies subsequent emotion, with more surprising events resulting in stronger emotional reactions.
Brene Brown Atlas of the Heart p. 66
Things are Beyond Us