...Behavioral and Brain Sciences employs a rather unique practice called "Open Peer Commentary": An article of major significance is published, a large number of fellow scholars comment on it, and then the original author responds to all of them. The approach has many virtues, one of which being that it lets you see where a community of scholars and thinkers stand with respect to a controversial or provocative scientific idea. And in the latest issue of the journal, this process reveals the following conclusion: A large body of political scientists and political psychologists now concur that liberals and conservatives disagree about politics in part because they are different people at the level of personality, psychology, and even traits like physiology and genetics.
That's a big deal. It challenges everything that we thought we knew about politics—upending the idea that we get our beliefs solely from our upbringing, from our friends and families, from our personal economic interests, and calling into question the notion that in politics, we can really change (most of us, anyway).
The occasion of this revelation is a paper by John Hibbing of the University of Nebraska and his colleagues, arguing that political conservatives have a "negativity bias," meaning that they are physiologically more attuned to negative (threatening, disgusting) stimuli in their environments. (The paper can be read for free
here.) In the process, Hibbing et al. marshal a large body of evidence, including their own experiments using eye trackers and other devices to measure the involuntary responses of political partisans to different types of images. One finding? That conservatives respond much more rapidly to threatening and aversive stimuli (for instance, images of "a very large spider on the face of a frightened person, a dazed individual with a bloody face, and an open wound with maggots in it," as one of their papers put it).
In other words, the conservative ideology, and especially one of its major facets—centered on a strong military, tough law enforcement, resistance to immigration, widespread availability of guns—would seem well tailored for an underlying, threat-oriented biology.
...Hibbing and his colleagues make an intriguing argument in their latest paper, but what's truly fascinating is what happened next. Twenty-six different scholars or groups of scholars then got an opportunity to tee off on the paper, firing off a variety of responses. But as Hibbing and colleagues note in their final reply, out of those responses, "22 or 23 accept the general idea" of a conservative negativity bias, and simply add commentary to aid in the process of "modifying it, expanding on it, specifying where it does and does not work," and so on. Only about three scholars or groups of scholars seem to reject the idea entirely.
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