Humans are social creatures, and humans also have a curious nature. Human curiosity is a means of learning which in this case is an attempt to get the results of that curiosity. Humans every day carry out activities that are actually symptoms of learning, such as bathing, eating, wearing clothes, communicating, and behaving.

The symptom of learning is the ability to do everything that is obtained, which previously did not exist or did not have the ability. By learning there is a change from not knowing to knowing, from not being able to being able and so on.

Changes due to learning will last a long time, even to a certain extent, and will not disappear again. Therefore, a theory emerged, that a learning outcome, relatively speaking, is constant and has scars. It is said relatively, because there is a possibility of a learning outcome being eliminated or deleted and replaced with a new result, but there is also a possibility that a result will be forgotten.

By adhering to the formulation of learning, there are several cases of change that cannot be called learning symptoms, including:

a. Changes due to physical fatigue
b. Changes due to using drugs
c. Changes due to severe illness or physical trauma
d. Changes due to physical growth.