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Baseline Phase
In a single-subject reversal design, the initial step is establishing a baseline for the dependent variable during Phase A. This phase acts as a control condition, representing the natural level of responding before any intervention is applied, and continues until a steady state of behavior is achieved.
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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(ABA), if a researcher observes that the target behavior does not return to baseline levels after the treatment is withdrawn, they can still definitively conclude that the treatment was the primary cause of the initial change.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.
Learn After
In a single-subject research study, what is the primary purpose of the initial baseline phase?
During the initial baseline phase of a single-subject study, the researcher actively manipulates the participant's environment to force their target behavior into a steady state before the formal treatment begins.
A researcher is monitoring a participant's frequency of social anxiety symptoms during an initial baseline phase (Phase A). Match each observed data pattern with the most appropriate methodological action based on the goal of establishing a steady state.
A researcher is establishing a baseline phase to study a participant's frequency of verbal outbursts. Arrange the following steps in the logical order required to analyze and establish a scientifically sound control condition.
You are designing a research protocol for a single-subject study. To ensure the initial baseline phase (Phase A) serves as a scientifically valid control condition, which of the following methodological plans should you create?
In a single-subject reversal design, the baseline phase is implemented after the intervention has started to measure its ongoing effectiveness.
Match each key feature of the baseline phase (Phase A) in a single-subject research design with the conceptual explanation that best describes its scientific purpose.
A researcher is critiquing a single-subject study where the treatment was introduced while the participant's behavior was still fluctuating significantly. The critic argues that the study's internal validity is compromised because the researcher failed to wait until the behavior reached a(n) _____ before moving past the baseline phase.
A researcher studying a child's disruptive classroom behavior records 15 sessions of Phase A data. The session-by-session counts fluctuate widely — ranging from 3 to 19 occurrences with no discernible pattern across sessions. A methodologist reviewing this record would conclude that Phase A cannot yet end, because the data have not yet produced a _____, which is the specific condition that must be achieved before a single-subject reversal design can proceed to the treatment phase.
A peer reviewer is judging whether the baseline phase in a published single-subject reversal design study was methodologically adequate. Arrange the following evaluative steps in the order that produces the most logically rigorous and defensible critique of Phase A.
Describe the baseline phase (Phase A) in a single-subject reversal design. Specifically, recall its order in the design, what condition it represents, and the criterion used to determine when to transition out of this phase.
Based on the principles of single-subject reversal designs, explain why the researcher should or should not introduce the intervention on day 5. Describe what Phase A represents and the requirement that must be met before transitioning to the intervention phase.
A psychologist is planning a single-subject reversal design to reduce a client's nail-biting behavior. How should they apply the rule for the baseline phase (Phase A) to establish a valid control condition before introducing the treatment?