Speaking clearly. Improving voice and articulation: Фонетический практикум. Фомиченко Л.Г. - 108 стр.

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the origin of feelings, which both felt, were physical in nature. They
questioned the chronological order in the development of feelings.
The scientists hypothesized that the physiological sensations preceded
the actual feeling; put it in another way, the feeling follows the
behaviour. This was a reversal from the more popular view that the
feeling caused the physiological changes. In a sense the James-Lange
theory works from the outside to the inside. For example, we are sad
because we cry, or we are afraid because we tremble.
       Now let’s apply this theory to the development of voice and
speech and the communication situation. It suggests that during your
«appearance» before an audience, the sweaty hands and increased
heart rate are causing the fear rather than the fear of the audience
causing the physical characteristics. If we can create voice and speech
that indicate excellence and give the outward appearance of confidence
and assuredness, then the appropriate changes are more likely to
occur within the individual. The application of this theory might aid
in the reduction of communication apprehension caused by that ap-
pearance before that audience. Although academically it might make
more sense to develop inside to outside, some creative artists advocate
working from outside to inside. The point is that if you sound and
appear at ease, you will eventually be at ease. The Roman poet Virgil
said that if you think you can do it, you can do it. So approach your
drills and exercises with verve and nerve. It is amazing what this
attitude can accomplish. Look what it did for Virgil!»
                                B.P. Zoller, J.A. Watkins, H. Lampman.
                                       Power Talk. Dallas. Texas, 1994