Social influence is the process by which individuals change their beliefs, attitudes, or behaviors in response to the real or imagined presence of others. Human beings have always lived in social groups, and the ability to influence others, as well as being influenced by them, has been essential for successful group living. This capacity for influence and susceptibility to influence has evolved over time, providing our ancestors with access to resources, protection from dangers, and the ability to attract desirable mates. From an evolutionary standpoint, social influence is shaped by adaptive psychological mechanisms that have developed over time through natural selection.
There are several different forms of social influence, which can be broadly categorized into three main types:
Compliance occurs when individuals change their behavior due to the direct or indirect request of others, often in order to gain rewards, avoid punishment, or be accepted by the group. Examples of compliance may include obeying orders from authority figures, adhering to social norms, or participating in group tasks. In an evolutionary context, compliance could have helped our ancestors avoid conflicts and maintain group harmony, which would have increased their chances of survival and reproduction. 
Conformity involves adjusting one's behavior to match the behavior of others in a group. This may be a result of an individual's uncertainty about the appropriate course of action or the belief that the group's opinions are more accurate than their own. Conformity can serve important adaptive functions, such as fostering group cohesion, facilitating cooperation, and promoting the adoption of beneficial behaviors. In the past, conforming individuals would have been more likely to benefit from the collective wisdom of their group and enjoy greater protection and resources. 
Persuasion refers to the process of changing someone's attitudes, beliefs, or behaviors through the use of arguments, reasoning, or other forms of communication. This can include both verbal and nonverbal cues and may be used to achieve various goals, such as convincing others to adopt new beliefs, change their preferences, or cooperate with the group. Persuasive ability would have been advantageous for our ancestors in negotiating with others, securing resources, and promoting group unity. 
Several evolutionary mechanisms have been proposed to underlie the human capacity for social influence:
- Bystander effect: This refers to the tendency for individuals to be less likely to offer help in emergencies when other people are present. The presence of others may lead individuals to assume that someone else will intervene or to underestimate the severity of the situation. This may have evolved as a means to reduce the costs associated with helping behavior, such as the risks of injury or retaliation.
- Mimicry: The automatic imitation of others' behaviors, such as facial expressions, gestures, and postures, can serve as a nonconscious form of social influence. Mimicry may function as a social glue, increasing interpersonal rapport and promoting group cohesion. It may also aid in learning new skills or behaviors that are advantageous in the given social context. 
- Social learning: Humans have a remarkable ability to learn from observation and imitation of others. This allows for the rapid spread of novel behaviors and innovations throughout a group, which can lead to increased efficiency, problem-solving, or adaptive strategies in the face of challenges. Social learning has likely played a crucial role in the evolution of culture, language, and other complex human traits.
- In-group bias: Individuals tend to favor members of their own group over those belonging to other groups. This can manifest as preferential treatment, increased trust, or greater cooperation with in-group members. Such bias may have evolved to facilitate cooperation among kin and group members, promoting unity and increasing the chances of shared success. 
From an evolutionary perspective, social influence is an essential aspect of human behavior that has shaped our ancestors' success in group living. The ability to influence, and be influenced by, others has allowed for the development of shared knowledge, values, and adaptive strategies that have been critical for the survival and reproduction of our species. By integrating insights from evolutionary psychology and social influence research, we can develop a deeper understanding of the adaptive functions that underlie our ability to navigate the complex web of social interactions and relationships that define human societies. 
- ↑ https://www.tandfonline.com/doi/full/10.1080/15534510.2011.649890
- ↑ https://www.britannica.com/science/evolutionary-psychology
- ↑ https://psycnet.apa.org/record/2006-20303-013
- ↑ https://link.springer.com/referenceworkentry/10.1007/978-3-319-16999-6_640-1
- ↑ https://www.researchgate.net/publication/232589049_Evolution_and_Social_Psychology
- ↑ https://plato.stanford.edu/entries/evolutionary-psychology/