Tyler Cowen writes,
I don’t think you can understand modern American discourse, most of all social media, without recognizing that “the intellectual Left” has higher neuroticism — as defined by Five-Factor personality theory — than say centrists. The Right of course has its own correlations, but that is a topic for another time.
He reproduces a chart based on a Pew survey that asks if someone was ever diagnosed with a mental health condition and breaks the respondents down by age and political orientation. I think that the main survey page is here, but I have not tried to download the data.
According to the chart, if you are young and liberal, there is a 46 percent chance that you have ever been told by a professional that you have a mental health condition (and admit it in the survey). If you are old and conservative, this chance is only 5 percent. If you are young and conservative, the chance is 15 percent. If you are old and liberal, the chance is 21 percent.
On the liberal-conservative difference: it could be that mental health conditions are equally prevalent across political orientation, but conservatives are more reluctant to seek a professional opinion and/or more reluctant to disclose to a survey researcher that they have been diagnosed.
On the age differences, the trend is dramatic. As you move from the 20-29 age cohort to the over-65 age cohort, liberals drop from 45 percent diagnosed to 15 percent, moderates go from 35 percent diagnosed to 17 percent, and conservatives go from 15 percent diagnosed to 5 percent.
Since the question is whether you were ever told that you have a mental health condition, all else equal this should go up with age, not down as in the chart. Again, there could be differences in willingness to seek an opinion or to disclose to a survey researcher.
But suppose that we take at face value the results that with each new cohort of white Americans, mental health is deteriorating. This would have a number of implications.
1. Mental health is unlikely to be mostly genetically determined. The gene pool cannot have changed that dramatically.
2. Jonathan Haidt’s claims about the harms of social media might explain the difference between the 20-29 cohort and the 30-49 cohort, but it seems unlikely to explain the trends in other cohorts. I suspect that the trend toward smaller and less stable families is the main factor in mental health deterioration.