not for their family, science, their business, society, and so on.
4
Therefore, what is called interest in someone or something is, in practice, a person’s interest in:
- repeating a pleasant past experience they had while being in those circumstances;
- finding new circumstances that will allow them to feel better.

It turns out that:
3
2
1
(regardless of what those circumstances turn out to be for them in practice)

This means that:
Because it is perception that allows a person to experience pleasant states and determines when they will feel better and when they will feel worse.

People, activities, places, and so on can’t be the object of interest.