Krista just found out that she failed her English class. Her friends are worried about her because Krista is treating the failure like the death of a loved one. Sigmund Freud would consider this an example of loss.

Symbolic loss  

Explanation:

The psycho-dynamic theory was [proposed by Sigmund Freud. He defined that many time depressions caused due to some biological reasons. Freud discusses depression that was related to the parent's negligence or rejection. Depressive people think that they are worthless. When a person lost his hope he will start to lose self-esteem, self-confidence. They start to neglect their child. They don't love them and give them proper time.  

Thus in the above statement, Krista found that she failed her English class. Her friend was worried about her because she was dealing with failure like death someone. This is the example of a symbolic loss.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.