Thus it is necessary to make certain ...

It should make some effort - no more and no less. We must cut the corner, slightly lifting it up - not to blow the whistle on the table. We are doing all these actions "automatically", without thinking, but using the wealth of information, a large database (data base). To better understand the "mechanism" of emotions, I propose to apply the definition of unconscious awareness. Imagine we walked through the woods, they saw a nearby wolf and scared. Do we realize the danger? "Of course. Did we in this case about the danger represented a logical series: the wolf is dangerous - he has big teeth - he can bite, it will be very painful - it may even lead to our destruction, etc.? No, of course, we have nothing so it does not think our fear - our unconscious (unconscious) reaction. There is generally no special mechanisms emotions. Emotion - it's specific thinking "living system". Awareness or unconscious awareness of danger - this is the emotion of fear. What is stress? On the topic of stress, you can find so much information and so controversial that it can get confused and come to the conclusion that this issue can not even come to any conclusion. So let us never will use the term "stress". There are preliminary reaction, they are adaptive - must be adaptive. They are due to the fact that some functions of the body can not "turn on" instantly - requires pre-training: the intensification of blood circulation, increase, more intensive oxygen saturation, turning off or lowering the activity of some functions that are secondary to the situation in favor of other functions, the redistribution of power flows and etc. How to turn a preparatory reaction? Suppose we feel the emotion of fear, ie, aware (or unconsciously aware of) danger. Can we, in this case by our desire to "remove" preparatory reaction, lower heart rate, blood pressure? No, and why - after all the preparatory reaction perfectly rational. Can we play a preparatory response to our request, arbitrarily, in the absence of deliberate threats? -Just do not. (At least in the norm - no). As we can see, the preparatory reaction "tied" to the emotions, the awareness of real danger. Clearly marked preparatory adaptive response (ie, stress response) can be observed at the time of parachute jumps. In the Internet you can find many interesting studies on this issue. (Eg http://health.rambler.rurtikles/8854/ or http://WWW.neurosoft.ru/old/support/ok2002_1/text.htm). Even an experienced skydiver, but some had the break in the jumps, at the time of the jump will be much pronounced stress reaction (ie, the preparatory reaction). Can we consider such a response appropriate? "Of course. On correctness, clarity of execution jumping (this term is considered in parachuting right), to a large extent depends on the degree of security.