>The take-away should not be that ketamine “is just a placebo,” Heifets emphasized.

This is the very definition of placebo and why double blind studies are done. The control group and the actual group both improved thinking they got the drug.

> In fact, there may be physiological resonance between the placebo effect — in other words, hope — and how ketamine works.

This is just mumbo jumbo. There's no 'resonance effect' if it works the same in the control group.