How are terror and horror different from one another, and how are they related to one another in Gothic literature?

I always think of terror as being a feeling ... scared. Horror is more like an observation.

The distinction between horror and terror is a standard literary and psychological concept applied especially to Gothic literature and film.[1] Terror is usually described as the feeling of dread and anticipation that precedes the horrifying experience. By contrast, horror is the feeling of revulsion that usually occurs after something frightening is seen, heard, or otherwise experienced. It is the feeling one gets after coming to an awful realization or experiencing a deeply unpleasant occurrence. In other words, horror is more related to being shocked or scared (being horrified), while terror is more related to being anxious or fearful.[2] Horror has also been defined as a combination of terror and revulsion.