The text points out that crisis tends to throw people into self-absorption. if all family members become self-absorbed, each may perceive inequity. this observation reflects theory.

Exchange theory

Explanation:

According to the exchange theory, all of the interaction that made by individuals will always be based on cost-and benefit analysis.  People will only interact if we feel that the benefit from the interaction will outweigh the expense/sacrifice.

When we use this theory to observe family conflict, the family members will most likely compared the situation that they have over other members in a way that benefit them the most. It is very likely for them to see that other family members have better condition/treatment to the point that they became self-absorbed and develop false sense of superiority over the other members.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

what is the question you are trying to ask?