So let us see how far she will go:
- our minds are wired in such a way that when we have a good thought about something, then that sends a pleasure signal to the brain which then gives us the experience of pleasant emotions.
- Our minds are wired to send these pleasant emotional signals, because we need those pleasant emotions
- We need pleasant emotions because they define our actions, thoughts, and lives as being good, valuable and worth living to us.
- Our thoughts and such (our logical thinking part of our brains) are not all that is needed to live a life that is good and worth living,
- without our feelings of pleasure, it is all nothing more than just the "thinking" experience
It is said among logicians that a logical argument is like a chain in that it is only as good as its weakest link. The link here I think could use some strengthening is premise (3).
We need pleasant emotions because they define our actions, thoughts, and lives as being good, valuable and worth living to us.
I mean, correct me if I'm wrong, but I understand a tenet of hedonism is, "If it feels good, one should do it!" and (3) seems to be making this inference to me. Since pleasant emotions feel good, they should be considered the most important thing that is good, valuable and worth having to us.
Is this the idea behind the premise? If so, I'll let you know why I don't yet find it convincing.