I have 'mixed emotions' [='mixed feelings'] about doing this. [=I'm not sure if I want to do this or not]
He's always found it hard to express (his) 'emotions'. [=to show his feelings]
The defendant showed/displayed no 'emotion' when the verdict was read.
(..) Somehow I question your motives. That is because you haven't been properly... stimulated yet. You have reactivated my emotion chip. Why? - Don't be frightened. - I am not frightened. - Do you know what this is? - It would appear to be organic skin. What a cold description for such a beautiful gift. (..)1996 Star Trek: First Contact
(..) I'll be sure to note that in my log. Captain, I believe I'm feeling... anxiety. It is an intriguing sensation. Data, perhaps you should deactivate your emotion chip for now. Good idea, sir... Done. Data, there are times that I envy you. It's only me! We have wounded here. (..)1996 Star Trek: First Contact