Placebo Groups in Research on the Effectiveness of ABA Therapeutic Techniques
Add a short placebo phase to your next single-case study and watch the real effect stand out.
01Research in Context
What this study did
Bąbel et al. (2018) wrote a think-piece, not an experiment.
They asked: can we add placebo arms to single-subject ABA studies?
They list every common objection and give a rebuttal for each.
What they found
The authors found no rule that blocks placebo controls in single-case work.
They show how to hide the placebo so client and therapist stay blind.
Ethics, they say, are manageable if the placebo is harmless and short.
How this fits with other research
Smith (2013) wanted package-level RCTs instead of tiny single tests.
Bąbel answers: keep the single-case logic, just add a placebo phase.
Perez et al. (2015) reviewed 17 sensory-integration single cases and saw weak proof.
A placebo arm could have shown if gains were real or just hope.
Barker et al. (2020) found sport SCEDs over-state effects without tight controls.
Placebo phases would shrink that inflation, the same way drug trials do.
Why it matters
You can run an A-B-Placebo-B design next week.
Add a fake social story or neutral toy session that looks like treatment.
Graph the placebo phase: if behavior flat-lines, your real intervention shines.
This small step gives you courtroom-grade evidence without ditching single-case ethics.
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02At a glance
03Original abstract
Behavior analysts have shown that a single-subject experimental design (SSED) is a useful tool for identifying the effectiveness of specific therapeutic techniques, whereas researchers outside applied behavior analysis (ABA) maintain that randomized placebo-controlled trials (RPCT) provide the most definite test of efficacy. In this paper the possible benefits that could result from supporting SSED studies by placebo control groups are discussed. However, the use of placebo groups in psychotherapy research arouses considerable controversy and many researchers argue against it. The main aim of this paper is to clarify theoretical and methodological problems associated with using placebo groups in psychotherapy research and to demonstrate that these problems can be solved if the assumptions on which they are based are reformulated. The article also discusses ethical issues about the use of placebo groups in research on the effectiveness of psychotherapy.
Frontiers in Psychology, 2018 · doi:10.3389/fpsyg.2018.01899