-The AtlanticRESULTS: The rats' blood alcohol concentration was about .08 percent (the legal driving limit in most U.S. states). The researchers considered this moderate. This level of intoxication did not impair their motor skills or their short-term learning.
Daily alcohol exposure, however, did impact the ability of the hippocampus to produce and retain new cells, reducing new brain cell production by nearly 40 percent
CONCLUSION: A moderate level of regular drinking, for even two weeks, conclude the researchers, "can have profound effects on the structural plasticity in the adult brain."
IMPLICATIONS: A blood alcohol content of .08 percent, which most wouldn't consider a binge, still affects the structure of our brain. The authors warn that while consistent moderate drinking may not be problematic in the moment, its detrimental effects can add up over time -- and can impact our ability to learn new things.
Details of the experiment in the article: http://www.theatlantic.com/health/archive/2012/10/study-even-moderate-drinking-impairs-brain-cell-formation/264129/
From the journal Neuroscience: http://www.sciencedirect.com/science/article/pii/S0306452212008457