Skepticism about Recent Evidence That Psilocybin “Liberates” Depressed Minds
ACS Chemical Neuroscience – August 24, 2022
Source: OpenAlex
Summary
Initial excitement about psilocybin's unique brain effects for mental health may be premature. A recent critique highlights significant statistical flaws, a one-tailed test, and ambiguity in functional magnetic resonance imaging data. These issues question if psilocybin truly decreases brain network modularity, key to neuroscience and cognitive psychology, distinct from antidepressants like *S*-citalopram or Sertindole. Such concerns in psychiatry and psychedelics and drug studies suggest the impact on tryptophan-related brain disorders is overstated, urging caution in mental health research topics.
Abstract
A recent paper in Nature Medicine found that psilocybin therapy in patients with depression decreased brain network modularity (measured with task-free functional magnetic resonance imaging), an effect supposedly not found with the selective serotonin reuptake inhibitor S-citalopram. This decrease in network modularity also correlated with depression. Here, we raise several issues with this paper, including inconsistencies in reports of the primary clinical outcome, statistical flaws including a one-tailed test, nonsignificant interaction, and regression to the mean, the ambiguity and overinterpretation of "resting state" data, and a missing reference for a conceptually similar study that exemplifies why a one-tailed test cannot be justified. Together, these issues make us question the uniqueness and impact of these findings, as well as the unwarranted media hype that they generated.