Problem 8
Question
A proposal to test an SSRI in a large number of individuals with depression was submitted to the FDA. Through random assignments, half of the patients would be controls, receiving nothing at all, and half the patients would receive the drug in pill form. Patients in both groups would note changes in their own mood in a daily journal. What flaw(s) do you note in this experimental design?
Step-by-Step Solution
Verified Answer
The control group should receive a placebo, and the study should be double-blind.
1Step 1: Identify the control group
The control group is the group that receives no treatment. In this experiment, the control group receives nothing at all.
2Step 2: Identify the experimental group
The experimental group receives the drug in pill form.
3Step 3: Consider the placebo effect
Participants might experience changes in mood solely because they believe they are being treated, not because of the actual drug's efficacy. This is called the placebo effect.
4Step 4: Importance of placebo for controls
The control group should receive a placebo pill (a pill with no active ingredients) to counterbalance the placebo effect and ensure that any observed changes in mood are due to the actual drug, not just the act of taking a pill.
5Step 5: Blinding to reduce bias
Both participants and researchers should be unaware of which group participants are in (double-blind study) to reduce bias in reporting and interpreting results.
6Step 6: Summarize the flaws
The flaws in the experimental design are: not providing a placebo to the control group and not ensuring a double-blind study.
Key Concepts
control groupplacebo effectdouble-blind studySSRI testingbias reduction
control group
In a clinical trial, the control group is essential for comparing the effects of the treatment.
The control group should closely resemble the experimental group but without receiving the treatment.
In this experiment, the control group received nothing at all, which is a problem.
By not providing a placebo, participants in the control group might feel left out and disturbed by their participation in the trial.
The lack of a placebo makes it harder to distinguish whether improvements are due to the drug or other external factors.
Always ensure the control group receives a placebo to maintain experimental integrity.
The control group should closely resemble the experimental group but without receiving the treatment.
In this experiment, the control group received nothing at all, which is a problem.
By not providing a placebo, participants in the control group might feel left out and disturbed by their participation in the trial.
The lack of a placebo makes it harder to distinguish whether improvements are due to the drug or other external factors.
Always ensure the control group receives a placebo to maintain experimental integrity.
placebo effect
The placebo effect is when participants experience changes simply because they believe they are receiving treatment.
This psychological effect can significantly influence study outcomes.
For example, if patients believe they are taking a real drug, they might report feeling better, regardless of the drug's actual efficacy.
It's important to account for this by giving the control group a placebo instead of nothing.
This way, any improvements in the experimental group's mood can more confidently be attributed to the SSRI.
This psychological effect can significantly influence study outcomes.
For example, if patients believe they are taking a real drug, they might report feeling better, regardless of the drug's actual efficacy.
It's important to account for this by giving the control group a placebo instead of nothing.
This way, any improvements in the experimental group's mood can more confidently be attributed to the SSRI.
double-blind study
A double-blind study is where both the participants and the researchers do not know who is in the control or experimental group.
This method helps in eliminating bias.
If researchers know who is receiving the treatment, they might unconsciously influence the results.
Similarly, if participants know they are in the control group, they might report their results differently.
Implementing a double-blind design ensures that the experiment's outcomes are more reliable and valid.
This method helps in eliminating bias.
If researchers know who is receiving the treatment, they might unconsciously influence the results.
Similarly, if participants know they are in the control group, they might report their results differently.
Implementing a double-blind design ensures that the experiment's outcomes are more reliable and valid.
SSRI testing
SSRIs, or Selective Serotonin Reuptake Inhibitors, are a class of drugs used to treat depression.
When testing SSRIs, it's crucial to measure whether they improve patients' moods better than a placebo.
The detailed monitoring of patient's mood through daily journals is a good practice.
However, it becomes meaningful only when bias and placebo effects are minimized.
Ensuring an appropriate control group and double-blind study will provide more credible evidence on the efficacy of SSRIs.
When testing SSRIs, it's crucial to measure whether they improve patients' moods better than a placebo.
The detailed monitoring of patient's mood through daily journals is a good practice.
However, it becomes meaningful only when bias and placebo effects are minimized.
Ensuring an appropriate control group and double-blind study will provide more credible evidence on the efficacy of SSRIs.
bias reduction
Bias can greatly affect the validity of a clinical trial.
It can come from both researchers and participants.
Using a double-blind design reduces this risk substantially.
Additionally, providing identical-looking placebo pills to the control group minimizes differences that might affect participants' expectations and behaviors.
Clever design strategies like these help in obtaining more trustworthy results.
Reducing bias strengthens the study's conclusions, thus making it more valuable for medical science.
It can come from both researchers and participants.
Using a double-blind design reduces this risk substantially.
Additionally, providing identical-looking placebo pills to the control group minimizes differences that might affect participants' expectations and behaviors.
Clever design strategies like these help in obtaining more trustworthy results.
Reducing bias strengthens the study's conclusions, thus making it more valuable for medical science.
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