In honor of The Neurocritic's 10th anniversary, I'd like to announce a new occasional feature:
In science, as in life, we learn from our mistakes. We can't move forward if we don't admit we were wrong and revise our entrenched theory (or tentative hypothesis) when faced with contradictory evidence. Likewise, it's possible that some of the critiques in this blog are no longer valid because additional evidence shows that the authors were correct. And vindicated. At least for now...
I've been collecting possible instances of this phenomenon for months, and I'll preview two of these today.
(1) In November 2015, I said that Obesity Is Not Like Being "Addicted to Food". Drugs of abuse are consistently associated with decreases in D2 dopamine receptors, but D2 receptor binding in obese women is not different from that in lean participants (Karlsson et al., 2015). Conversely, μ-opioid receptor (MOR) binding is reduced, which supports lowered hedonic processing. After the women had bariatric surgery, MOR returned to control values, while the unaltered D2 receptors stayed the same.
However, a recent study in mice “points to a causal link between striatal dopamine signaling and the outcomes of bariatric interventions” (Han et al., 2016). How relevant is this new finding for clinical studies in humans?
(2) In another post, I poo-pooed the notion that there is One Brain Network for All Mental Illness. However, a subsequent paper in Molecular Psychiatry claimed that common psychiatric disorders share the same genetic origin (Pettersson et al., 2015). If so, could this result in common brain
In the future, I'll take a closer look at these and other examples to see if I should revise my opinions.
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