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Internal Validity of Reversal Designs
The removal of the treatment in a reversal design significantly increases a study's internal validity compared to a simpler AB design. By demonstrating that the dependent variable changes when the treatment is introduced and subsequently reverts when the treatment is withdrawn—assuming the treatment does not create a permanent effect—researchers can more confidently rule out extraneous variables and conclude that the intervention caused the observed changes.
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Research Methods in Psychology - 4th American Edition @ KPU
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Baseline Phase
Treatment Phase
Internal Validity of Reversal Designs
Multiple-Treatment Reversal Design
Alternating Treatments Design
ABAB Design
Internal Validity in Reversal Designs
ABAB Reversal Design Example
Limitations of Reversal Design
Arrange the phases of a fundamental reversal design (ABA design) in the correct chronological order.
In a research study using a reversal design (ABA), what is the primary scientific purpose of withdrawing the treatment and returning to the baseline condition in the final phase?
A researcher is investigating the effectiveness of a 'gold star' reward system on a student's on-task behavior using a reversal design. Match each specific step of the study to its corresponding phase label in the ABA model.
In a single-subject reversal design (ABA), if a researcher observes that the target behavior does not return to baseline levels after the treatment is withdrawn, they can still definitively conclude that the treatment was the primary cause of the initial change.
When evaluating the appropriateness of a reversal (ABA) design for a specific study, a researcher must ensure that the target behavior is ______; if the behavior will not return to baseline levels once the treatment is removed, the design cannot effectively demonstrate experimental control.
Which of the following alternative names is commonly used to refer to the reversal design, the most fundamental single-subject research design?
In a single-subject reversal (ABA) design, the 'reversal' in the final phase is achieved by introducing an opposite treatment to actively force the behavior back to its baseline state.
A clinical psychologist is evaluating a new deep-breathing exercise to reduce a patient's daily anxiety attacks. Match each proposed action in the study to its corresponding phase within a standard ABA reversal design.
In a research study utilizing a single-subject ABA design, the researcher withdraws the treatment in the third phase specifically to return the participant to the _____, thereby analyzing whether the treatment was the actual cause of any behavioral change.
An educational researcher is evaluating the causal impact of a peer-tutoring program on a student's spelling accuracy using a reversal design. Arrange the steps of the study in the correct chronological order to assess the treatment's effectiveness.
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What feature of a reversal design primarily increases its internal validity compared to a simpler AB design?
In a reversal design, internal validity is strengthened when the dependent variable reverts to its previous state after the treatment is withdrawn.
A researcher is studying whether a 'standing desk' reduces sedentary behavior in an office worker using a reversal design. Arrange the following steps in the sequence that best demonstrates internal validity by ruling out extraneous variables.
In a single-subject reversal design, researchers analyze data patterns to establish whether an intervention caused a change in behavior. Match each potential experimental observation with the logical analysis of its impact on the study's internal validity.
You are designing a research protocol to determine if a 'mindfulness-reminder' app reduces task errors for a participant. To create a study structure that offers the most robust internal validity by specifically ruling out the possibility that error reduction was caused by a coincidental change in workload or mood, which design should you construct?
Match each term related to single-subject research with the statement that best describes its role in establishing internal validity.
If a behavior does not return to baseline during the withdrawal phase of a reversal design, a researcher evaluating the study's internal validity must consider whether the treatment had a(n) _____ effect or if an extraneous variable was responsible for the initial change.
A clinical psychologist uses a reversal design to evaluate a treatment for anxiety. The patient's anxiety decreases when the treatment is introduced, but remains low after the treatment is withdrawn. True or False: Based on this outcome, the psychologist can confidently rule out extraneous variables and conclude that the treatment caused the reduction in anxiety.
A researcher is analyzing why a reversal design provides stronger internal validity than a simple AB design. They conclude that the reversal design demonstrates control by showing that the dependent variable changes when the treatment is introduced and reverts when it is withdrawn. However, this analytical logic is invalid if the treatment creates a _____ effect.
A researcher wants to evaluate the causal impact of an intervention using a reversal design. Arrange the steps of the experimental process in the logical sequence required to successfully demonstrate internal validity by ruling out extraneous variables.
Explain how the removal of a treatment in a reversal design increases the internal validity of a study compared to a simpler AB design. In your explanation, identify the key behavioral pattern researchers look for and the critical assumption that must be met regarding the treatment's effect.
Based on this scenario, explain how the reversal phase (removing the tactile tool) helps the psychologist establish internal validity, and describe what the psychologist must assume about the tactile tool's effect to justify a causal conclusion.
A clinical researcher wants to evaluate a training program that permanently teaches deep breathing techniques to reduce anxiety using a reversal design. Apply the core assumption of reversal designs to explain why this program is not suitable for this specific research design.