Answer:
front brain
Step-by-step explanation:
The "front brain" or frontal lobe dictates many things in a person's life such as a person's personality, ability to socialize with people, judgment, reasoning, planning, emotions and so on.
Part of this is his ability to judge people from what they're going through, just like noticing the feelings and emotions of others. In this case, he tries to evaluate the situation. For example, if he notices a friend crying, he'll approach him and console him.