http://psychologytoday.com/articles/pto-19940901-000013.htmlTEMPERAMENTAL JOURNEY
o Approximately 20 percent of white infants are born with the high reactivity pattern that gives rise to the inhibited temperament.
o White babies are generally more reactive than Asian babies.
o Inhibited kids have narrower faces than uninhibited ones. It's known from animal studies that stress hormones in utero inhibit the lateral growth of the upper jaw bone.
o Temperamental patterns of infants can be detected in utero by heart rate measurement.
o Early infant reactivity reflects inherited excitability levels of nerve cells in the amygdala.
o Inhibited kids show higher rates of attention deficit disorder than do noninhibited kids (33 vs. 10 percent).
o Parents of children with behavioral inhibition have significantly higher rates of panic disorder, social phobia, and general childhood and adult anxiety disorders.
Another link:
http://www.thesuccessfulparent.com/articles/styles.htm
