Hi dude,
Lots of questions ...I'm not sure whether your first sentence is a question? But I've tried to cover the rest of them... Questions Are Our Friends : )
Sentiment is always harmful if we experience it personally, because of the neurochemical changes it causes. It isn't harmful if we were to emulate it to avoid hassle, for example, but it's much better to avoid anything that might induce it at all. Genuine emotion is acceptable in most situations!
[sirhinojo wrote]:And emotion is almost a purely measurable physical reaction that a situation demands from us (such as mating, cleaning, fighting, cooperating, etc)?
Not according to the model I'm using, although this depends on how the individual researcher defines 'emotion' (as we've noticed with Damasio). In the model used for tutorials here, emotions are responses; not reactions. The emotion is the abstract mental mode (or mood) that matches up with the physical responses. Responses are interactions, designed to assist our adaptation to our context and circumstances by synchronizing our mood with the required behavior. It would be of little use if creatures desired sex for example but could not get their bodies to respond to match their mood (a problem some humans get on too much alcohol).
[s]So sentiment is not a reaction to reality but rather a reaction to a simulation (meaning cultural).
Yes to the first bit, no to the second. Emotions are cultural, sentiments are societal.
If you're having problems understanding why sentiments always slow us down, look more closely at the emotions they are replacing. Look at things like the difference between pride and hubris, or arrogance and confidence. Once you get familiar with what should be going on, and how that enables the creature to function expediently, it's easier to see how the substitutions of sentiment can be made when anxiety is present and we slip into 'protection mode'.
I plan to cover emotional stability in greater depth in tutorial 9, when I get there : ) However, I realize this isn't addressing your original query which was, how do the emotion/sentiment concepts fit into Damasios model. Answer: they don't; it's a different model. I doubt whether Damasio recognizes the difference between emotions and sentiments because he probably hasn't even heard of the idea, and so sentiments will be described as being emotions. I'm not sure anybody has sussed the difference out except for us lot.
There are a few models using the concepts of 'positive' and 'negative' emotions, which aren't consistent and include both emotions and sentiments, and I don't know of any other research in this area with a clear model for what is and what is not dysfunction that can both explain experimental results and predict behavior, so we'll obviously stick with ours unless a better one comes along.
Best,
AR