Before revision: Functional imaging upon placebo analgesia has been summarized as showing that the placebo response is "mediated by 'top-down processes dependent on frontal cortical areas that generate and maintain cognitive expectancies.
After revision: 'Functional imaging upon placebo analgesia has been summarized as showing that the placebo response is "mediated by 'top-down processes dependent on frontal cortical areas that generate and maintain cognitive expectancies.