Some of the positive photos used in the study were similar to this one – a group of smiling strangers. Luis Alvarez/DigitalVision via Getty Images

Ketamine paired with looking at smiling faces to build positive associations holds promise for helping people with treatment‑resistant depression

In a new study, a single infusion of the antidepressant – along with repeated exposure to positive imagery – significantly reduced symptoms in depressed patients in a clinical trial.

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