Two major findings have emerged from theseresearches, Firstly, the greater part of the development of observedintelligence occurs in the earliest years of life. lt is estimated that 50percent of measurable intelligence at age 17 is already predictable bythe age of four. Secondly, he most important factors in theenvironment are language and psychological aspects of the parent-child relationship. uch of the difference in measured intelligencebetween "privileged" and “disadvantaged" children may be dueto the latter 's lack of appropriate verbal stimulation and the povertyof their perceptual experiences.The main idea of this paragraph is___

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