Internal Inhibition and Sleep Are Essentially the Same Physicochemical Process30
The basic condition for the onset and development of this inhibition and sleep is absolutely the same. It is a more or less continuous or many times repeated, isolated conditioned stimulation, that is, stimulation of the cortical cell. In this chapter, Pavlov proves that exhaustion of the cortical cell and its weakening in general serve as the basis for the development of inhibition and the following onset of sleep. A very large number of rapidly changing stimuli may often long resist the general involvement of the hemispheres by the inhibitory process and delay the onset of sleep. And vice versa, a strictly established order of alternation between waking and sleep, a fixed rhythm may enhance the insistence of sleep without sufficient fatigue of the cortical cells. The chapter reveals Pavlov’s dialectical interpretation of inhibition as ‘“partial” sleep, as irradiated inhibition, and formulates the idea of the protective significance of inhibition and sleep.