When testing a new drug,researchers control for a placebo effect by using

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The double-blind procedure is used to control for the placebo effect in drug testing. This involves assigning participants to either the experimental group (those receiving the drug) or the control group (those receiving a placebo) without revealing which group they are in to either the participants or the researchers administering the drug. This ensures that any observed effects are due to the drug itself and not just the placebo effect. The other options listed (neurogenesis, rTMS, and deep-brain stimulation) are not related to controlling for the placebo effect.

When Testing a New Drug,researchers Control for a Placebo Effect