It looked at acetaminophen ( paracetamol ) , the main ingredient in aspirin . Eighty one people were asked to look at happy , sad and neutral images . Those who took the drug had less extreme emotions towards the photos . People who took pain reliever did n't know they were reacting differently .
It looked at acetaminophen ( paracetamol ) , the main ingredient in Tylenol . Eighty one people were asked to look at happy , sad and neutral images . Those who took the drug had less extreme emotions towards the photos . People who took pain reliever did n't know they were reacting differently .