Aprocedure used to study the structure of the mind, the main method of investigation for structuralists; looking into one's own mind for information.

Introspection

Explanation:

 The introspection is the term which is refers to the analyzing your own personality and the actions for the purpose of self-awareness.

The introspection is the process of evaluating the own feelings behavior and the thoughts.

 According to the given question, the introspection is refers to the procedure that is mainly used in the study for structuring the thoughts in our mind and it is one of the important method for investigation the given information.

 Therefore, Introspection is the correct answer.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.