Teaching and learning from preschoolers
Most studies find that the prevalence of mood and anxiety disorders have remained constant over time. From 1990 to 2010, for instance, the global prevalence of major depressive disorder (MDD) remained around 4.4% and for anxiety disorders was 4%. There is little evidence that increased treatment rates reduce suicide rates, and there has been no appreciable decline in cross-national suicide rates, which vary dramatically across countries and regions.
Anxiety is characterized by fear or panic, irritability, hyper vigilance, racing heart, loss of sleep, and other symptoms associated with fight or flight responses, which also seem to be functional responses to genuine social and environmental threats . . . These characteristics suggest that these "disorders" . . . might be functional responses to adversity.
Depression is characterized by persistent sadness, low mood, and anhedonia, which, like ordinary sadness and grief, are probably forms of "psychic pain" that adaptively focus attention on adverse events that would have reduced fitness . . . so as to mitigate the current adversity and avoid future such adversities.
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