The sleeper effect is a term coined by Hovland and Weiss (1952), two psychologists who prepared several articles on controversial topics, such as the feasibility of an atomic-powered submarine. American subjects read the articles, and Hovland and Weiss measured their opinions on the subject. They found that communications by high-credibility sources (such as the acclaimed physicist J. Robert Oppenheimer) were more persuasive, but over time its power decreased while the persuasive power of the low-credibility source increased. 

When individuals make decisions based on how easy it is to imagine similar instances, they're using what is known as the availability heuristic. Shark attacks are far more likely to be covered by news sources than asthma-related deaths; thus, stories of shark-related deaths are more available in one's memory.

According to cognitive dissonance theory, Cindy will feel conflicted over her desire to join the sorority and need to complete difficult challenges. After she is a part of the sorority, she will attempt to manage this conflict by liking the sorority more; therefore, justifying her actions. 

The fundamental attribution error is the tendency to attribute other people's behaviors to internal or dispositional factors. A person who passes a car accident and commits the fundamental attribution error would attribute blame for the accident to the person. The fundamental attribution error does not say anything about how we make attributions about our own behavior; however, the actor-observer bias says that we tend to make dispositional attributions for the behavior of others and situational attributions for our own behaviors. 

The bystander effect is related to diffusion of responsibility, and states that bystanders are less likely to help a victim if other bystanders are present. For example, if a person is having a medical emergency, he will be less likely to be helped if he is in a large crowd. The bystander effect says he would be most likely to be helped if only one or two other people are present, since the bystanders are more likely to feel responsible for helping. 

The fundamental attribution error is the tendency to people to attribute a negative outcome to individual characteristics when it refers to someone else (Jake being dumb) and attribute a negative outcome to the context of the situation when it refers to themselves (Jake citing his lack of sleep and studying). Cognitive dissonance is the conflict that you feel when your attitudes are not in synch with your behaviors. The gain-loss principle suggests that an evaluation that changes over time has more of an impact than an evaluation that remains constant over time. Diffusion of responsibility occurs when an individual assumes less personal responsibility in a given situation when there are other people present.

Cognitive dissonance is the theory that your attitudes and actions will eventually align; if they are not congruent, either your attitudes or your actions will change. In this case, Tony's attitude is changing to align with his actions (using online testing resources). 

Solomon Ashe was most famous for his conformity study, the line test. The social psychologist most widely recognized for door in the face is Robert Cialdini.