How does Pavlov understand the type of human temperament?

Pavlov divides nerve types into four types: weak type, strong and unbalanced type, strong and balanced lazy type and strong and balanced flexible type.

Pavlov believes that the weak can not fully adapt to life, are vulnerable to attack, and easily become patients in difficult situations.

And strength and imbalance are bellicose and easy to become patients.

So Pavlov thinks that both the weak type and the strong unbalanced type have certain defects.

These are only experimental descriptions. There are many factors that control people's emotions and higher nervous activity, so we can't think that someone has a certain temperament type according to a certain theory.