Although in a sense we have control over our viewpoints and thoughts, there are many external biases that can influence them— one such influence is groups.

Groupthink refers to an individual's inclination to alter their views and opinions in order to match the group or majority consensus. Furthermore, when we are in groups of those with similar opinions, it is proven that our initial opinions heighten, which is a phenomenon called group polarization. For example, there was a study conducted in which participants were asked about their opinion on their president. When asked individually, participants expressed their opinions, but it was done so in a toned-down manner. Then, they were put in groups, with those who had similar opinions being grouped together. After their discussion on the topic, the groups were dispersed and each participant was individually asked for their opinion again. This time, most of the individuals had very extreme, heightened opinions, which was a contrast to their initial responses before they discussed with the group.

It is obvious, then, that other people have a great, unconscious influence over our own actions. This is most likely because, in the time of our ancestors, grouping together was seen as a method of survival. The majority consensus would allow the pack to decide which behaviors promoted survival and which hindered it. Furthermore, since they were always facing danger, traveling in a group benefited everyone.

This can also be seen in mob mentality and peer pressure— people are influenced by those around them to conform. Reasons for this include fear of being alienated from the group and a desire for approval and inclusion. Another reason in which we may act synchronously to our peers is automatic mimicry, which is basically the automatic response to conform to the crowd without any prior thought.

All in all, the influence which others have on us is unconscious and involuntary. However, we must try our hardest to be aware of these external influences on our behavior and actions.