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Internal Validity in Reversal Designs
The removal of the treatment in a reversal design is essential for demonstrating causality. While a simple AB design cannot easily rule out the possibility that an extraneous variable caused the change in the dependent variable, a reversal design addresses this issue. If the dependent variable changes when the treatment is introduced and then reverts when the treatment is removed, it strongly indicates that the treatment caused the effect. This reversal process significantly improves the internal validity of the study, provided the treatment's effects are not permanent.
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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(ABA), if a researcher observes that the target behavior does not return to baseline levels after the treatment is withdrawn, they can still definitively conclude that the treatment was the primary cause of the initial change.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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In a reversal design, why is the removal of the treatment considered essential for improving the study's internal validity?
If a treatment produces permanent changes in a participant's behavior, a reversal design remains an effective method for demonstrating high internal validity.
A researcher is studying whether 'white noise' reduces anxiety in a patient during therapy sessions. They decide to use a design where the noise is played in some sessions and turned off in others. Match each phase of this study with its logical role in establishing the internal validity of the treatment.
In a research study where an intervention is withdrawn to demonstrate its effect, a researcher must analyze the data to establish internal validity. Arrange the following steps in the logical order required to rule out the possibility that an extraneous environmental factor (rather than the treatment) caused the observed change in behavior.
You are tasked with designing a research protocol to prove that a new 'sensory-integration' technique is the sole cause of a student's improved focus, ruling out the possibility that the student simply habituated to the classroom over time. You have already completed a baseline phase () and a treatment phase (). Which of the following experimental plans would you construct to best establish a causal relationship and maximize internal validity?
A simple design is highly effective at ruling out the possibility that an extraneous variable caused the observed change in the dependent variable.
Match each research design scenario or condition with its corresponding implication for internal validity when establishing a causal relationship.
When evaluating the internal validity of a study that involves introducing and then withdrawing a treatment, a researcher must judge whether the behavioral change reverts to its original state. If it does not, the researcher cannot support a causal claim because they have failed to rule out _____ variables.
A researcher is studying the effect of a focus-enhancing app on a student's attention. After introducing the app, attention increases, but when the app is removed, attention remains high. In this scenario, the researcher cannot establish causality because they are unable to rule out the influence of a(n) _____ variable.
Evaluate the strength of causal evidence in a reversal design by ordering the phases of research from the initial setup to the final evaluation of internal validity.
Based on the provided text, recall and explain why the removal of the treatment is considered essential in a reversal design. In your answer, describe the limitation of a simple AB design that this removal addresses, and state the critical condition regarding the treatment's effects that must be met for a reversal design to be valid.
Based on the principles of reversal designs, explain why Dr. Aris cannot confidently conclude that the token economy system caused the reduction in disruptive behavior. Diagnose the threat to internal validity and justify your decision based on the behavior's failure to revert.
Imagine you are designing a single-subject study to test whether a noise-canceling headset reduces off-task behavior in an office worker. Apply the logic of a reversal design to describe the specific sequence of phases and the expected changes in off-task behavior that must occur to demonstrate high internal validity.