Chapter 1 endnote 2, from Lisa Feldman Barrett.
Some context is:
My students and I had discovered a similar phenomenon for emotions, which I described as emotional granularity.
The term granularity is common in computer science and physics where it refers to a level of detail, for example, coarse-grained or fine-grained. I coined the term "emotional granularity" in the 1990s, and the discovery of this phenomenon inspired a new domain of research in the field of emotion.
Emotional granularity is also known as “emotional complexity,” “emotion differentiation,” or "emodiversity." You know a phenomenon is important when scientists discover it repeatedly and name it slightly differently each time. This happens a lot in psychology.