Understanding the Evolution and Role of Smiles

The video explores the evolution of smiling as a form of communication, highlighting its unique role in human interaction compared to other mammals. It discusses how primates use teeth-baring for non-aggressive communication and how this behavior may have influenced human smiles. Studies show that smiling enhances trust and cooperation, with people more likely to trust smiling faces. Smiling is linked to social bonding and cooperation rather than just happiness. The video concludes by suggesting that smiling evolved from a threat signal to a friendly gesture, emphasizing its role in human social interactions.

What is the primary function of a smile according to the introduction?

• To indicate hunger

• To show aggression

• To communicate friendliness

• To express confusion

How do rhesus macaques use their teeth-baring expression?

• To show happiness

• As a sign of submission

• To indicate hunger

• As a sign of aggression

Which primate shows a clear connection between teeth-baring and social bonding?

• Lemurs

• Chimpanzees

• Orangutans

• Gorillas

What is the significance of the silent bared-teeth expression in primates?

• It indicates aggression

• It signals non-aggression

• It shows hunger

• It displays confusion

What did the 2001 study reveal about smiling faces?

• They are considered more aggressive

• They are perceived as more generous

• They are seen as less trustworthy

• They are viewed as more intelligent

What was the main finding of the 2001 trust game study?

• People trusted non-smiling faces more

• People trusted smiling faces more

• People were indifferent to facial expressions

• People trusted angry faces more

In the 2007 study, when did people tend to smile more?

• When they were confused

• When they were angry

• When they were sharing

• When they were alone

What does the research suggest about the relationship between smiling and emotions?

• Smiling is directly linked to happiness

• Smiling is unrelated to cooperation

• Smiling is more about cooperation than happiness

• Smiling is a sign of anger

What did participants report about their emotions in the 2007 study?

• Smiling was unrelated to their emotions

• Smiling was linked to anger

• Smiling was linked to confusion

• Smiling was linked to sadness

What evolutionary change is suggested about the human smile?

• It evolved from a sign of submission to aggression

• It evolved from a threat to a friendly gesture

• It evolved from a sign of confusion to intelligence

• It evolved from a sign of hunger to happiness