In the article "Parenting and Its Effects on Children: On Reading and Misreading Behavior Genetics" for the psychology journal "Annual Reviews," professor Eleanor E. Maccoby, Ph.D, of Stanford University links parental negativity to child depression and the internalization of behaviors. In the National Institutes of Health journal article "Relation of Positive and Negative Parenting to Children’s Depressive Symptoms" by Danielle H. Dallaire et al, found that harsh and negative parenting behaviors correlated with symptoms of depression in children. Other factors that may contribute to childhood depression include low levels of overall support, parental depression, physical punishment, unhealthy expression of negative emotions and a lack of emotional support.