From the question and comments, I believe the word the OP is asking for and means enjoying something more when being in the center of the happening is engagement.
According to Merriam-Webster, engagement means "a job or period of employment especially as a performer," or "emotional involvement or commitment."
A simpler word would be just involvement, which,...
The evolution of signal form: effects of learned versus inherited recognition (The Royal Society Publishing)
Organisms can learn by individual experience to recognize relevant
stimuli in the environment or they can genetically inherit this
ability from their parents...We analyse the joint effects of receiver
biases, signal cost ...
Wikipedia has a list of impulse control disorders described in the DSM.
As can be seen from the list, many "official" names of impulsive disorders do not end in mania - eg, pathological gambling, sexual compulsion, compulsive buying, and the one most closely related to what is described in the question: Pathological lying. And if it doesn't fit in the ...