Placebo effect continues after group made aware: Study

placeboOftentimes in research a test group will receive a medication and a control group will receive a placebo. Typically the control group will not be made aware that they are taking a placebo to truly test the effects of the medication. But new research suggests that even if patients know they are taking a placebo, it still may offer health benefits.

Researchers from the University of Colorado at Boulder conducted a study to further explore the placebo effect. They wanted to know whether or not participants who knew they were taking a placebo would affect study outcomes.


The findings suggest that even if patients in a study are made aware that what they are taking a placebo will have no effect on them, some effect still occurs. The catch, though, is patients must receive the placebo first and then be told it is a placebo. Researchers found that even after confirming the medication is a placebo, participants will continue to report positive effects.

“We’re still learning a lot about the critical ingredients of placebo effects,” said lead author Tor Wager.

“What we think now is that they require both belief in the power of the treatment and experiences that are consistent with those beliefs. Those experiences make the brain learn to respond to the treatment as a real event. After the learning has occurred, your brain can still respond to the placebo even if you no longer believe in it.”

For the study, researchers applied heat pads to the forearms of participants, hot enough that it would inflict some level of pain. After the heat was applied, test subjects were given an analgesic gel – in the meantime researchers lowered the heat, but did not tell the participants.

The gel was actually Vaseline with blue food coloring in it. Scott Schafer, lead researcher participants acquired the placebo effect and believed they were getting relief from the pain.

“We tested them with and without the treatment on medium intensity. They reported less pain with the placebo,” said Schafer.


Researchers believe the findings show hope for treatment of drug addiction or pain management.

Schafer added, “if a child has experience with a drug working, you could wean them off the drug, or switch that drug a placebo, and have them continue taking it.”


Author Bio

Emily Lunardo studied medical sociology at York University with a strong focus on the social determinants of health and mental illness. She is a registered Zumba instructor, as well as a Canfit Pro trainer, who teaches fitness classes on a weekly basis. Emily practices healthy habits in her own life as well as helps others with their own personal health goals. Emily joined Bel Marra Health as a health writer in 2013.