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. Author manuscript; available in PMC: 2023 Oct 19.
Published in final edited form as: Proc IEEE Inst Electr Electron Eng. 2023 May 23;111(10):1236–1286. doi: 10.1109/JPROC.2023.3273517

Fig. 13.

Fig. 13.

Illustration of different emotion correlations. (a) Emotion hierarchy: a three-level hierarchy from sentiment to primary emotion and secondary emotion [234]. (b) Emotion similarity: Mikels’ emotion wheel on the left [193] and emotion circle on the right [218]. (c) Emotion boundedness: rough transformation between discrete emotion categories and continuous emotion values in the VAD space [46].