Classic psychology experiments in the 1970s revealed that certain expres-sions of emotion, including happiness, anger, fear and disgust, are universal across cultures.

A 2015 study found that out of 100 well-known psychology experiments, only 39 were successfully reproduced.

In psychology experiments, participants put first into enforced boredom are more likely to be cruel and to leap to judgment.

The listeners were examined on their perseverance, visual attention, verbal memory and logical and creative thinking through several games borrowed from previous psychology experiments.

For this reason, many social psychology experiments utilize deception to conceal or distort certain aspects of the study.