Something similar is experienced by humans shuffling and changing their commitments and activities – or- accelerating in their frames of happiness.
A relative experience point of view, because happiness is so important to the brain, that instead of demanding fixed requirements of input and feedback of activities for happiness, the brain would adapt to have its own reference of happiness to each individual.
I believe that’s the reason children can adapt through tough psychological environments at the cost of whatever they become later on in life.
Due the facts that all human brains are limed and similar, also due the universe entropy and life randomness, the human brain adapts to develop two types of experiencing happiness imagined as Sinusoidal waves:
First rule, is that happiness occurs and would only gravitate to its receivers.
Second rule, is that it doesn’t affect or matter to anything or anyone but the receiver.
The two types are, in summary:
1- Expected satisfactions
2- Satisfying expectations.