Well it's not that you need to banish emotion. It's not a vulcan thing.
This is just the first part of I don't know how many posts on this because I haven't even begun to probe the depths of it but let's just say that where a lot of people go wrong is thinking that there is no such thing as being too "pumped up".
Think of the level of the emotional component as arousal. Anxiety, etc, is not ALL bad. But there has been an emphasis by most trainers and coaches on the "psyched up" component and that is what most lifters have learned. Basically thinking that the more arousal the better the performance. Wrong! Absolutely wrong.
Now when we were discussing this before I mentioned that we should seek a middleground. That is, that there is something to be learned from the people who get all psyched up and there is something to be learned from those who seek a calm, quiet place, so to speak. However, I did NOT mean that the optimum level is therefore always right smack in the middle of the scale.
Because if you REALLY think about past lifting performances and the cognitive states that have accompanied success and failure you will start to realize that it's almost like 'bad medicine'. Meaning you have a sweet spot that is right for you BUT anything to the left or right of that does not result in these incremental performance declines, which is how it would be if the sweet spot was always in the middle of an arousal scale. What you have instead is technical failure or "castostrophic" failure on either side of it. So we are talking about a threshold.
But I truly think that most need to learn how to 'bring it down' rather than notch it up.
I mentioned the guys that really get psyched up and CHARGED before a big lift. You know the kind of thing I'm talking about. Go look at some videos of that and look at how this psyching up process affects their BODY. This is all about mind/body connection and the key is muscular tension.
You know, I'm always telling people to relax the neck. Usually they think it is all about avoiding injury and that is part of it but it is mostly about when I see inappropriate tension. I may see it in the neck but I imagine it travelling down the kinetic chain.