Good morning I would like someone in great ape cognition subjects could answer-solve my two doubts regarding an investigation for my thesis master. I study zoos gorillas and I came to doubt these two questions:

1- Can great apes express the emotions of others, whether live or in photography? (They are known to have empathy, but at this level they may come).

2- Important, and I give many laps, do they have complexes, such as complex inferiority or superiority, like we who look from shoulder to shoulder or bend our heads to a being better than we? It is based on subjects of dominance and submission but does it make them feel that inferiority or superiority as the human being feels? How could a study of this area be carried out to arrive at the answer of this hypothesis?

For now these are my doubts.

Thank you for everything.

Ivan.