Empathy

Empathy is a Fallout and Fallout 2 Perk.

You have studied other human beings, giving you the inside knowledge of their emotional reaction to you. You will see the reaction level of the person you are talking to, when involved in an in-depth conversation.

Use
When in dialogue, if a dialogue option is red, it will cause a negative reaction. If it is blue, it will cause a positive reaction. Green dialogue options cause neutral reactions.