What is a key reason why single-subject designs are recognized as a form of experimental research that typically demonstrates strong internal validity?

Match each methodological component of single-subject research with its specific role in establishing a causal relationship.

A clinical psychologist is using a single-subject design to test if 'progressive muscle relaxation' (the independent variable) causes a reduction in a client's 'reported stress level' (the dependent variable). Order the following steps to demonstrate a causal relationship using an ABA (withdrawal) design.

A critic's claim that single-subject designs are not 'true' experimental designs because they lack the control groups found in group designs is an accurate evaluation of their internal validity.

A key assumption of single-subject research is that causal relationships can be discovered by manipulating an independent variable and controlling extraneous variables.

In the context of single-subject research, what is the primary consequence of failing to maintain rigorous control over extraneous variables?

A researcher is conducting a single-subject study to evaluate the impact of a new coaching technique on an athlete's performance. If the athlete also starts a new physical training program at the same time the coaching begins, the training program acts as a _____ variable, which makes it impossible to establish a definitive causal relationship between the coaching and the performance improvement.

A researcher conducts a single-subject study to determine whether a daily mindfulness exercise (10 minutes of guided breathing) reduces self-reported test anxiety in a college student. Match each specific action the researcher took to the methodological component of single-subject research it represents.

A clinical psychologist conducts a single-subject study testing whether a structured journaling protocol reduces a client's nightly insomnia. The client begins journaling in Phase B. Midway through Phase B, the client's psychiatrist also adjusts the client's medication — a change the psychologist did not plan or control. When the psychologist later tries to conclude that journaling caused the reduction in insomnia, this conclusion is undermined because the study has compromised _____, the property that reflects the degree to which observed changes in the dependent variable can be confidently attributed solely to the manipulation of the independent variable.

A student is critically evaluating whether a published single-subject study successfully established a causal relationship between a relaxation intervention and reduced migraine frequency. Order the logical steps the student should follow when evaluating the strength of the causal claim, from the most foundational criterion to the final integrative judgment.

State the key assumption of single-subject research regarding how causal relationships are discovered, and explain why this methodology is considered a form of experimental research with strong internal validity.

Based on the assumptions of single-subject research, diagnose the methodological flaw in the researcher's conclusion. Explain how this flaw violates the core assumptions needed to establish a causal relationship and describe its impact on the study's internal validity.

A behavioral psychologist wants to test whether a token economy system increases a student's on-task behavior using a single-subject design. Describe how the psychologist should implement the three core methodological requirements of single-subject research to demonstrate a causal relationship.