zekko said:
I think your explanation is adequate. This is a common theme in a lot of pickup material. Using positive body language helps pull your mood and attitude up to match it. It's a fairly well known phenomenon. The usual example is if you make yourself smile it tends to make you feel more happy.
There's a lot of talk about how body language changes your own perception of yourself. I'd like to see more studies on the effect of body language on the people around you. Like how using alpha body language increases a woman's attraction for you, for example. Does it intimidate beta males in the area and make other alphas want to fight you?
Ah but there is, at least indirectly. It doesn't only change attitude and mood, it changes your HORMONES.
http://www.people.hbs.edu/acuddy/in press, carney, cuddy, & yap, psych science.pdf
"The neuroendocrine profiles of the powerful differentiate them from the powerless, on two key hormones—testosterone and cortisol. In humans and other animals, testosterone levels both reflect and reinforce dispositional and situational status and dominance; internal and external cues cause testosterone to rise, increasing dominant behaviors, and these behaviors can elevate testosterone even further"
The study goes on to say power poses increase testosterone, and reduce cortisol.
And there are many studies that look at the effect of hormones on other people.
http://www.livescience.com/28812-women-prefer-smell-of-manly-guys.html
Women can actually identify high T guys just from smelling their T-shirts alone, without even seeing, touching or hearing them when they are ovulating. High T leads to some other by-products that women can smell.
http://www.huffingtonpost.com/2013/06/01/mens-sweat-pheromone-cooperation_n_3371709.html
Some men produce androstadienone which makes other males cooperative. However, this affects high testosterone men more than low testosterone men.
http://www.sciencedaily.com/releases/2010/01/100113122514.htm
Men can smell when women are ovulating and their testosterone rises accordingly.
There are several more studies including: women who live together sync menstrual cycles. Women who sense another women ovulating, have higher testosterone in order to compete, etc..
I think the answer to your question zekko, is that the psychological effects of behavior poses are obvious. As to the full hormonal effects, we would have to study more about pheromones or pheromone like chemicals that seem to dictate a lot of our actions without us knowing it.