My thoughts and my behaviors. I suppose there is a third kind of emotion-hacking, namely hacking your emotional responses to external stimuli. But it's not as if I can respond to other people's thoughts, even in principle: all I have access to are sounds or images which purport to be correlated to those thoughts in some mysterious way.
All emotions are responses to external stimuli, unless your emotions relate only to what is going on in your head, without reference to the outside (i.e. outside your body) world.
I agree you can't respond to others' thoughts, unless they express them such that they are "behaviors." Interestingly, the "problem" you have with the sounds or images (or words?) which purport to be correlated to others' thoughts is the same exact issue everyone is having with you (or me).
if we're confident in our own ability to express our thoughts (i.e. the correlation problem is not an issue for you), then how much can we dismiss others' expressions because of that very same issue?
Another monthly installment of the rationality quotes thread. The usual rules apply: