Final answer:
Paul Ekman identified six universal facial expressions of emotion that are recognized worldwide, regardless of cultural differences. These expressions are happiness, surprise, sadness, fear, disgust, and anger, and their universality is supported even in individuals who cannot see them being expressed by others, like the congenitally blind.
Step-by-step explanation:
Psychologist Paul Ekman identified six universal facial expressions of emotion that are recognized across different cultures. These include happiness, surprise, sadness, fear, disgust, and anger. Despite cultural differences in emotional display rules, this ability to recognize and express emotions through facial expressions appears to be universal. Ekman's work, along with the research of others such as Charles Darwin, has shown that even individuals who have never had the opportunity to see these expressions can produce them, such as those who are congenitally blind, further supporting the universality of these emotional expressions.