A group size effect on personal risk judgments: implications for unrealistic optimism

Area of Science:

• Cognitive Psychology
• Health Psychology
• Social Psychology

Background:

• Unrealistic optimism describes the tendency for individuals to perceive themselves as less likely to experience negative events compared to others.
• Previous research has explored factors influencing risk perception, but the impact of group size on perceived health risks remains an area for further investigation.

Purpose of the Study:

• To investigate the effect of group size on perceived heart attack risk.
• To determine if perceived risk of a typical employee increases with company size.
• To explore the relationship between group risk perception and individual risk perception.

Main Methods:

• College students evaluated heart attack risk profiles for fictional employees across companies of varying sizes.
• Participants judged the risk of a typical employee and, in some experiments, individual employees.
• Statistical analysis examined the relationship between the number of employees and risk judgments.

Main Results:

• Risk judgments for a typical employee increased as the number of employees in a company increased.
• In experiments comparing group and individual risk, the typical employee was perceived as being at higher risk than individual employees.
• The observed group size effect aligns with established psychological frameworks for bias.

Conclusions:

• The size of a group influences the perceived risk associated with that group.
• This group size effect may contribute to unrealistic optimism regarding personal health risks.
• The findings can be modeled within Fiedler's BIAS framework, offering insights into risk perception biases.