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However, the researchers neglected to include into their research the effects of extrafamilial factors (friends, peers, teachers, etc.) on the cognitive skills of these children. If these factors were not overlooked, the research may have proven that the environment does indeed influence cognitive development. Without this research, as it stands now, it is concluded that the greatest influence on cognitive development is solely attributed to genetics. In light of this particular perspective, the article is …

…Myers, David G. Psychology: Fifth edition. Holland: Worth Publishers Inc., 1986. Neimark, Jill Nature’s Clones Psycology Today July August 1997 p. 39 Plomin, Robert, et al. “Nature, Nurture, and Cognitive Development from One to Sixteen Years: A Parent-Offspring Adoption Study.” Psyscological Science 8 (1997): 442-47 Plomin, Robert and McClearn, Gerald E. Nature Nurture & Psychology Washington: American Psychological Association 1993 Yarrow , Leon J., et al. “Infant and Environment”. Washington: Hemisphere Publishing Co.,1975. *Daulton, Thomas Beyond Heredity and Environment. Boulder: Westview Press 1995