In Malcolm Gladwell's book, "The Tipping Point," he discusses the concept of emotional contagion, highlighting that certain individuals are exceptionally adept at conveying their emotions. These people, referred to as "senders," have the ability to influence others' feelings and behaviors due to their expressive nature.

The phenomenon of emotional contagion underlines the importance of interpersonal connections. Those who are skilled at sharing their emotions can create significant social impacts, affecting the mood and actions of those around them. This ability illustrates how small emotional expressions can lead to larger changes in group dynamics and social environments.