Answer:
Observable behaviors are now measured.
Step-by-step explanation:
The field of psychology witnessed a change when the new subject of thought entered in the filed. From being the subject of theory, psychology changed to that of a scientific discipline because of the dominancy of behaviorism school of thoughts. This school focused on measuring the behavior that were observable. The behavior of the human was studied and observed with certain experiments performed in the laboratories and closed environment. These experiments helped in understanding the behavior and learning processes of humans.