“…Defined this way, behavioral development is a consequence of ongoing activity across levels of the organism-environment system (Kuo, 1976;Lickliter, 2000;Miller, 1997). These levels include, but are not limited to, genetic activity, cellular activity, neural activity, behavior itself, and the effects of the environment (see Gottlieb, 1998Gottlieb, , 1999Gottlieb, , 2000Keller, 2000).…”