Addressing External Validity in Single-Subject Research
Single-subject researchers address external validity concerns by relying on the strong, consistent effects they observe, which are likely to generalize even from small samples. Additionally, they place a strong emphasis on replication; by attempting to reproduce effects with different participants or under slightly varying conditions, they systematically build confidence in the generalizability of their results. This methodological approach is supported by the historical success of principles like classical and operant conditioning, which were primarily discovered using single-subject research and have been successfully generalized across an incredibly wide range of species and situations.
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Research Methods in Psychology - 4th American Edition @ KPU
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Addressing External Validity in Single-Subject Research
Example of External Validity Concerns in Single-Subject Research
Generalizability of Strong Effects in Single-Subject Research
Why is the external validity of single-subject research frequently questioned by critics?
If a single-subject study demonstrates that a specific behavioral intervention successfully reduces self-injury in two children, a critic questioning the study's external validity would argue that these results may not necessarily apply to other children in the broader population.
A researcher conducts a single-subject study with three children to evaluate a new social-skills training program. Match each element of this research scenario to its role in a critique of the study's external validity.
A researcher finds that a new intervention successfully reduces social anxiety in two college students. Arrange the following logical steps to represent the process of analyzing why these findings might not apply to the broader population.
Generalization of Single-Subject Self-Injury Treatment
Replication for External Validity in Single-Subject Research
An educational psychologist conducts a single-subject study and demonstrates that a specialized visual-schedule intervention successfully reduces transition-related anxiety in two specific children with developmental delays. If a critic questions the external validity of these findings, what is the core of their concern?
A peer reviewer evaluates a single-subject study involving two participants and concludes that the findings should not be used to inform national healthcare guidelines. This judgment is based on the study's inherent deficiency in _____ validity.
Critics of single-subject research frequently question its external validity because of the difficulty in knowing whether the observed treatment effects will successfully _____ to other individuals in the broader population.
A clinical psychologist publishes a single-subject study showing that a new behavioral intervention successfully reduces self-injury in two children with intellectual disabilities. If they claim this study proves the treatment will be effective for all children with intellectual delays, this claim is invalid because it ignores the inherent external validity concerns caused by the small sample size of single-subject designs.
A researcher publishes a single-subject study examining a treatment for self-injury. Match the elements from the study's critique to their correct descriptions or roles in evaluating external validity.
A researcher claims a self-injury treatment is ready for general use based on a single-subject study of two children. Order the steps an evaluator should take to assess the external validity of this claim, from the initial observation to the final evaluation.
Describe the primary reason why critics frequently question the external validity of single-subject research, and state what specific difficulty they point out regarding the treatment effects observed in these studies.
Explain why advocates of group research would question the researcher's claim that this treatment is ready for widespread adoption. In your explanation, demonstrate your understanding of the relationship between sample size and external validity in this context.
A school psychologist conducts a single-subject study with three students and finds that a new mnemonic strategy significantly improves their spelling test scores. Applying the external validity concerns characteristic of single-subject designs, what main question should a critic ask about these findings before recommending the strategy for all students in the school district?
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Which of the following strategies is primarily used by single-subject researchers to address concerns regarding external validity?
To address concerns about external validity, single-subject researchers typically rely on random selection to ensure their small samples accurately represent the broader population.
A behavioral psychologist has found that a specific 'self-monitoring' checklist improves the study habits of a college student in a single-subject study. Arrange the following steps in the order the researcher should take to systematically build confidence in the external validity of this checklist using the single-subject approach.
Analyze the logic of single-subject research by matching each methodological strategy with the specific way it addresses concerns regarding external validity.
The principles of classical and operant conditioning are historical examples of findings discovered through single-subject research that have been successfully generalized across a wide range of species and situations.
Single-subject research is often criticized for having limited external validity due to its small sample sizes. Which of the following best describes the logic single-subject researchers use to demonstrate that their findings are generalizable?
Match each researcher action to the specific external validity strategy it illustrates in single-subject research.
Single-subject researchers counter external validity criticisms by arguing that the _____ of their observed effects makes generalization plausible even from a small sample—because an effect that appears powerfully and reliably across every session is less likely to be a fluke tied to one unusual individual—and by systematically replicating findings across different participants or conditions to accumulate converging evidence of the effect's breadth.
A graduate student is evaluating whether a published single-subject research program has adequately established external validity. Arrange the following evaluative steps in the most logical order for rendering a justified, evidence-based judgment.
When a critic challenges the generalizability of a single-subject study because of its small sample size, the researcher's most scientifically sound defense is to provide evidence through _____, which demonstrates that the findings remain consistent across different participants or conditions.
Based on the single-subject research methodology, state the two primary ways researchers address concerns about external validity, and identify a historical example of psychological principles discovered through single-subject research that successfully generalized across species and situations.
Explain how the psychologist can defend the generalizability of their initial findings using the characteristics of the observed effect, and explain what subsequent research steps they should take to systematically build confidence in the generality of these results.
Imagine you are conducting a single-subject study on a new biofeedback technique to reduce high blood pressure. You have found a strong, consistent reduction in blood pressure in your first participant. Apply the methodological principles of single-subject research to describe how you would design your next two steps to establish the external validity of this intervention.