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Zald, D. and W. G. Iacono (1998). "The development of spatial working memory abilities." Dev Neuropsychology 14(4): 563-578.
It is well known that the human brain continues to develop well into the second decade of life. This study made use of MTFS 14- and 20-year-old males to measure the extent of such development in memory for spatial location. Results indicate that this form of memory improves significantly from age 14 to age 20.
Hur, Y., McGue, M. & Iacono, W.G. (1996). "Genetic and shared environmental influences on leisure-time interests in male adolescents." Individual Differences 21(5): 791-801.
This study explored genetic and environmental influences on leisure-time activities in MTFS 17-year-olds. The leisure-time activities addressed in the survey could be separated into 9 categories: intellectual activities, sports, music and artistic activities, handicrafts, hunting and outdoor activities, foreign travel, TV viewing, dating and social activities, and religious activities. While the proportions varied, all of the categories showed both genetic and shared environmental influences, though non-shared environmental influences predominated.
McGue, M., T. Bouchard, et al. (1993). "Behavior genetics and cognitive ability." Nature, nurture, & psychology. R. Plomin and G. E. McClearn. Washington, DC, American Psychological Association: xvi, 498.
This book chapter presents evidence that the genetic influences on cognitive ability increase during adulthood
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