Alternatives to "Honest Signals" theory of non-semantic communication
A related theory of latent dimensions of emotional expression is Affect Control Theory (ACT), which can be broken into four separate dimensions in "The World of Emotions Is Not Two-Dimensional" by Fontaine et al. Three of these dimensions map easily onto Honest Signals. This is shown in the table below:



The mismatching dimensions of ACT and Honest Signals are Valence/Pleasantness and Mimicry. This makes sense since ACT is more focused on the expression and perception of emotions, whereas Honest Signals is more about the co-operation of two individuals. In other words, when two people are interacting, it's more important if one person is responding to that other person's emotions than what that emotion is. This is interestingly confirmed in Non-Violent Communication, which establishes that mirroring an emotion must be done before the root cause of that emotion can be addressed.