You create technology that interacts with emotions. This can manifest in two different ways. The first is technology that detects and manipulates emotions. The second is technology that is powered by emotions. For the latter, they type of emotions used to power the device can effect it’s effectiveness. An offensive weapon may be better powered by negative emotions while a healing device may be better powered by positive emotions. Artificial Emotions gained from direct power use or tinkertech has a reduced or zero effects when powering you devices. Indirect methods such as illusions doesn't have such restrictions.