TY - JOUR AU1 - Molenaar, Peter AU2 - Boomsma, Dorret AU3 - Dolan, Conor AB - An illustrative list is presented of human and animal studies which each point to the existence of a third source, in addition to genetic and environmental factors, underlying phenotypic differences in development. It is argued that this third source may consist of nonlinear epigenetic processes that can create variability at all phenotypical-somatic and behavioral-levels. In a quantitative genetic analysis with human subjects, these processes are confounded with within-family environmental influences. A preliminary model to quantify these influences is introduced. TI - A third source of developmental differences JF - Behavior Genetics DO - 10.1007/BF01068142 DA - 2005-01-14 UR - https://www.deepdyve.com/lp/springer-journals/a-third-source-of-developmental-differences-7BmAK94NsI SP - 519 EP - 524 VL - 23 IS - 6 DP - DeepDyve ER -