Warm-up effects
Refers to when initial response rates in baseline are weaker due to a subject needing to get warmed up.
Task List Reference: D-2
Distinguish between internal and external validity.
Systematic replication
An experimental replication of a previous study in which the researcher intentionally changes one or more features of a prior experiment.
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Practice effects
Refers to an improvement in responding from the opportunity to practice a behavior, specifically during prolonged baseline measurement periods.
Maturation
Refers to the changes in a subject over the course of the study that result from natural growth and development.
Let’s Break Down a BCBA® Mock Exam Question: Identifying Measurement Confounds in Experimental Design
PTB co-founder Dana Meller breaks down a BCBA® mock exam question that explores the difference between measurement confounds and subject confounds, how they relate to threats to internal validity in ABA research.
Refer to BCBA® Task List (5th ed.) Section D-2: Distinguish between internal and external validity.
Intrasubject direct replication
An experimental replication of a previous study in which the researcher exactly duplicates a previous study using the same subjects as the original study.
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Intersubject direct replication
An experimental replication of a previous study in which the researcher exactly duplicates a previous study but uses different subjects from the original study.
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Internal validity
The extent to which an experiment strongly shows that changes in the dependent variable are a direct result of the independent variable and not the result of some other uncontrolled
Extraneous variables
Any aspect of the environment that must be held constant to prevent unplanned environmental variations during experimentation, usually something the experimenter is aware of and for which they do their
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External validity
The extent to which the results of a study can be generalized to other settings, behaviors, or subjects.
Experimental Validity: The Relationship between Behavior Change & Independent Variables
PTB co-founder explains the different types of validity in ABA.
Refer to BCBA® Task List (5th ed.) Section D-2: Distinguish between internal and external validity.
Experimental Validity: The Relationship between Behavior Change & Independent Variables Read More
Dana Do’s: How to Decipher the Many Forms of Validity
It’s particularly meaningful to be able to tell validity, social validity, internal and external validity apart. PTB co-founder Dana Meller has some tips to do just that.
Dana Do’s: How to Decipher the Many Forms of Validity Read More