Compiti ed esercitazioni VERIFICATO
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- The (Un)Placebo Effect: This study investigates if a patient's awareness of the placebo effect can reduce the effectiveness of an active medical treatment.
- Placebo Fundamentals: The brain can elicit healing responses from fake treatments (placebo effect), effectively treating conditions like pain or insomnia. A key unknown is whether the brain can similarly negate a real treatment (unplacebo effect).
- Types of Placebo Effects:
- Placebo Effect: Positive expectations enhance treatment outcomes.
- Nocebo Effect: Negative expectations worsen treatment outcomes.
- (Un)Placebo Effect: Belief in receiving a placebo reduces the efficacy of an actual treatment.
- Research Motivation: With widespread public knowledge of placebos, the study questions if this awareness could diminish the effectiveness of treatments, especially when used in clinical trials.
- Experiment Design:
- Sample: 30 participants, ages 20-25, with type 2 ADD (inattentive), not on stimulant medication.
- Treatment: Amino acid L-tyrosene, administered daily for 2 weeks.
- Variables: Independent variable was awareness of receiving a placebo; dependent variable was treatment effectiveness, measured via self-report (ASRS-v1.1) for ADD symptom severity.
- Design: Randomized clinical trial using a between-subject design, chosen for its suitability in clinical research and evaluating treatment efficacy.
- Experimental Groups:
- Treatment Group (15 subjects): Told they would receive a placebo, but received L-tyrosene.
- Control Group (15 subjects): Received L-tyrosene with no additional information.
- Key Results:
- Treatment Group: ADD symptom scores decreased from 12.2 to 8.7 (3.5 point reduction).
- Control Group: ADD symptom scores decreased from 12 to 5 (7 point reduction).
- Effect Size (Cohen's d): 0.69, indicating that awareness of potentially receiving a placebo significantly reduced the treatment's perceived effectiveness compared to the uninformed control.
- Validity Considerations:
- No carryover effects were expected.
- Internal validity was rated medium due to potential for participant distrust, though not directly observed as a confound.
- External validity was rated high, suggesting generalizability to real clinical settings where similar cognitive processes might occur.
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