Hi Eve and Kora, 

Interesting discussion. 
I had felt the same confusion when reading about the connection between the three elements. from my point of view, perception is a translation of what surrounds us that will be transmitted and filtered by generated emotions (like a personal reading map of the world). Beliefs are a terminal conscious representation of this process. example: I am taking an exam (event), I feel anxious (tachycardia, sweating, etc.), I experience a lack of confidence (emotion), I believe that any evaluation is stressful. 
Can you correct me?

Bests,