For decades, researchers have probed the conundrum of genetics vs. environment. Now new research from Oregon State University found that adoptive parents who had a tendency to over-react when their child tested age-appropriate limits or made mistakes also had children who had “negative emotionality” or acted out and had more temper tantrums.
Health Canal.com has reported that researchers found that higher increases in negative emotionality from children nine to 27 months were also found to have the highest levels of problem behavior at age two.