A dominant which persist for months or years greatly limits one’s interests and makes one’s development very uneven. This might be useful for your job, but, to quote a witty phrase: a specialist is like a gumboil; he is one-sided. On the other hand, a dominant focus that subjugates all weaker dominant points enables an erudite to extract from the depths of his brain immense amounts of useful information. Every routine lecture delivered by such a specialist can become a really memorable event.
A dominant is a regular occurrence in normal brain activity. Even very primitive animals are subject to dominant states, although in them it arises as a result of simpler causes, the instincts of hunger and thirst, self-preservation, or reproduction. The force of a dominant may change to correspond to the organism’s needs. A strong focus of dominant excitation can subdue or subjugate all weaker dominants.
A hungry dog rushes towards its feeding bowl at every movement made by its master. The dog has a food dominant. But, if you place this dog into a new, strange environment, it will put its tail between its legs and forget its hunger. Now any sound, any new smell and the like will make it growl or grin. Finally, twice a year, when the bitch’s organism is flooded by sexual hormones secreted by the endocrine glands to prepare it for bearing offspring, the dog will forget its fears, its hunger, and its master, and its entire behavior will be concentrated on the task of reproduction.