The il­lus­tra­tions so far have pri­mar­ily re­ferred to the so-called spon­ta­ne­ous-rhyth­mic proc­esses in hu­mans which are there­fore con­stantly tak­ing place. Even when a per­son is rest­ing or sleep­ing, they emerge with par­ticu­lar in­ten­sity in their regu­la­ting prin­ci­ples. Fur­ther­more, the or­gan­ism also has the abil­ity to form fur­ther rhyth­mic-pe­ri­odi­cal proc­esses, and that is pref­era­bly at the time when it is in de­mand and un­der pres­sure. This means that the re­ac­tions of the or­gan­ism also take place in a rhyth­mic-pe­ri­odic struc­ture. These time struc­tures are called re­ac­tive pe­ri­ods.

In the spec­trum of the wave­lengths these re­ac­tive pe­ri­ods are each be­tween the spon­ta­ne­ous rhythms (il­lus­tra­tion 22). Their size and com­plex­ity also in­crease with the wave­length, and, based on sim­ple re­laxa­tion proc­esses, in­creas­ingly take on the fea­ture of com­pre­hen­sive ad­ap­ta­tion proc­esses, where­by the body ad­justs new func­tional bal­ances. This also in­cludes the self-heal­ing re­ac­tions of the or­gan­ism.

The pe­ri­odic du­ra­tion of the re­ac­tive pe­ri­ods ad­mit­tedly de­vi­ates from the spon­ta­ne­ous rhythms, but, as a rule, re­late to the neighbor­ing spon­ta­ne­ous rhythms in a sim­ple whole num­bered-har­monic way. The re­act­ing or­gan­ism then has new har­mon­ies ready where­by the over­all con­text of tem­po­ral struc­tures can be main­tained. The re­ac­tive pe­ri­ods are trig­gered by the in­ter­ven­tions put­ting on strain, and dis­ap­pear again, when the func­tional bal­ances have been re-es­tab­lished, the dis­tur­bances com­pen­sated.