This functional three-structuring of the endogenous-autonomic system also shows itself in a different behaviour of performance of the individual rhythmic processes (illustration 7).
Thus, the performance of the information system is expressed in the gliding frequency changes of the nerval action rhythm, whereby each frequency is in close correlation to level of excitement of the nervous elements, and therefore also to the intensity of the specific environmental effects which hit them. With acoustic stimuli, the pitch is also illustrated in the nerval rhythm. Only under peaceful conditions and especially during sleep, are the nervous elements, dependent on the depth of sleep, synchronised to tissue rhythms with favoured frequency bands (cf. the EEG-criteria for depth of sleep).
Illustration 7
The
frequency pattern of the endogenous-autonomic rhythms in the three functional
areas of the spectrum of illustration 6. The vertical thick line describe
preferential periodic duration and/or norms of frequency, the horizontally
shaded fields mark the areas of frequency modulation.
The periodic duration is applied dual-logarithmically on the abscissa, so
that the scale of frequency conditions in the top left field applies in all
areas of the spectrum.
(According to HILDEBRANDT 1986)
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Chronobiological
Aspects of Music Physiology
continued
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