It seems that for whatever reason, abstinence does correlate with lower performance on at least some tests of mental ability. The question is whether the controls in the study cover all the variables through which these lower abilities might have manifested themselves in practice; to me it seems quite plausible that the answer could be no.
A hypothesis: drinking is social, and enjoying others’ company plays a role in survival (perhaps in learning too?).
At this point, the link between abstinence and social isolation is merely hypothetical. But given the extensive history of group drinking – it’s what we do when we come together – it seems likely that drinking in moderation makes it easier for us develop and nurture relationships. And it’s these relationships that help keep us alive.
The discussion of the same paper on Overcoming Bias has reminded me of another striking correlation I read about recently:
http://www.marginalrevolution.com/marginalrevolution/2010/07/beer-makes-bud-wiser.html
It seems that for whatever reason, abstinence does correlate with lower performance on at least some tests of mental ability. The question is whether the controls in the study cover all the variables through which these lower abilities might have manifested themselves in practice; to me it seems quite plausible that the answer could be no.
A hypothesis: drinking is social, and enjoying others’ company plays a role in survival (perhaps in learning too?).