Early experience can have lasting effects on behavior

Studies of how the environment can turn genes on and off—a field called epigenetics—are providing clues to how early experience can have lasting effects on behavior, even across generations. Epigenetic changes are likely to be involved in the effects of the environment on development of the nervous system. Knowledge of epigenetic processes may offer targets for the development of new medications.

http://menanddepression.nimh.nih.gov/health/publications/brain-development-during-childhood-and-adolescence/index.shtml

[Sam: If "early experience can have lasting effects on behavior, even across generations," supportive, stimulating and rewarding experience during infancy through interactive playgroups should have a chance to repair and alter the architecture of a damaged brain. In any way, an enjoyable childhood in the company of other children and a highly energetic playgroup teacher would have lasting positive effect on the genes.]