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Evaluate Dr. Smith's conclusion based on your understanding of the placebo effect. What alternative explanation should he consider for the control group's improvement, and what specific psychological mechanism drives this phenomenon?
Case context: Dr. Smith is conducting a clinical trial for a new anxiety medication. The control group receives a simulated treatment (a sugar pill). After four weeks, participants in the control group report significantly lower anxiety levels and show enhanced immune system functioning, despite receiving no active intervention. Dr. Smith claims these results prove his anxiety medication is ineffective, because the control group improved without it.
Question: Evaluate Dr. Smith's conclusion based on your understanding of the placebo effect. What alternative explanation should he consider for the control group's improvement, and what specific psychological mechanism drives this phenomenon?
Sample answer: Dr. Smith's conclusion is flawed because he is ignoring the placebo effect. The control group's improvement is likely an autonomous positive outcome resulting from the simulated treatment. This phenomenon is driven primarily by the participants' expectation that they will improve. Holding this expectation of recovery can autonomously lead to the exact benefits observed—lower anxiety and enhanced immune system functioning—even without the active intervention.
Key points:
- The control group likely experienced a placebo effect, meaning the active medication may still have effects beyond the baseline of expectation.
- The primary driver of the control group's improvement is their expectation that they will improve.
- Expectations alone can autonomously reduce anxiety and enhance immune functioning.
Rubric: Full credit for evaluating Dr. Smith's conclusion as flawed by identifying the placebo effect as the alternative explanation, and correctly identifying that the participants' expectation of recovery is the psychological driver of the reduced anxiety and improved immune functioning.
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Research Methods in Psychology - 4th American Edition @ KPU
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Evaluate Dr. Smith's conclusion based on your understanding of the placebo effect. What alternative explanation should he consider for the control group's improvement, and what specific psychological mechanism drives this phenomenon?
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