Which of the following statements accurately characterizes the reasoning behind the changes in brain function that occur with placebo treatment? O Participants psychologically believe they are taking medication, which attributes a change in brain function to psychological responses. O The placebo still has a physical effect, but is just less intense than the real drug, causing the change in brain function. O The realization that a pill is only a placebo causes people to shut down even more, further reducing the functioning of the brain. O The lack of actual medication in a placebo causes the pill to be an ineffective treatment method, leading to no change in brain function.