Ekman's studies of facial emotional communication imply that

Ekman's studies of facial emotional communication imply that there are similarities and differences in the recognition of emotional expressions.

Explanation:

The Ekman and Friesen study on the emotional expression studied people from around the world and their ability to identify emotions through facial expressions across cultures. They found that this ability seemed to transcend culture, meaning that facial expressions are likely biological (nature), not cultural (nurture). Thus, Ekman's studies of facial emotional communication imply that there are similarities and differences in the recognition of emotional expressions.