X is whelmed. From underwhelmed to over-.
Y is Stimulated, from over to understimulated.
Use each quadrant to define each state.
Define the matrix of over to under for both. Impact of them too.
Aiming for oscillation with whelmed as a baseline, abc stimulated with deeper troughs.
I have a first draft example of the concept here: jonathanstephens.us/play/stimwhelm.