This study is an important one in helping understand the etiology of
some of the chronic behavioral disorders emerging in industrialized
societies. Thank your for a study of simple, logical and profound
effects.
Various catchment studies are suggesting depression and violent
behaviors are increasing among young people. Our study (Embry et al.,
1996, American Journal of Preventive Medicine) funded by the US Centers
for Disease Control and Prevention, shows that serious aggressive behavior
among children is rather high, including threats by weapons in elementary
school.
I understand that depression numbers among youth have gone through
the roof, and very clearly so have attention problems in school. Sleep
deprivation is well documented as a factor in poor behavior, poor
cognitive skills and even social rejection by peers. What I like about
this study is the principle of Occam's Razor, or the simplest explanation
suffices. This would help explain the sharp rise in problem behavior
among middle class and upper class kids, which alomst any mental health
professional or school teacher has noticed. Taking a cue from some
research on computer games, it is probable that the exposure to the
programming is increasing activation of the HPA axis. This clearly
affects down stream levels of serotonin and the turn over of
catacholimines. Sleep will be affected. All of this fits elegantly
researech in evolutionary psychology on response to danger cues.
What is perverse is that the social isolation of TV viewing (among
older kids) seems to affect social competence, not direct aggression.
This increases peer rejection, which drives higher level of social
isolation--higher rates of TV viewing.
I suspect that the effects of the TV viewing are being further
magnified by other trends. For example, middle class and upper class
children clearly have fewer chores than 20 years ago. Chores occasion
reinforcement for competence. Additionally, larger school size (from a
mean of 127 in 1940 to 800 today) further erodes opporunity for meaningful
"work" and social reward. All of these factors, if we take seriously the
primate and other literature, reduce states of belonging and serotonin.
This drives a higher need for immediate "reward" which is partly met by
the stimulation of the TV programming (as best I understand the
physiological research on this subject).
To the authors, well done. If there is a next time study, you might
want to measure some simple physiological indices plus nurses office
visits. We have found (in a published study) that nurses' office visits
are a very useful way of measuring impact.
Sincerely,
Dennis D. Embry, Ph.D.