Combined antecedent variables as motivating operations within functional analyses.

The team ran a multielement functional analysis on two clients.

Standard alone, attention alone, demand alone, and play alone conditions showed zero problem behavior.

They then added a fifth condition that mixed two antecedents at once, like attention plus demand.

Problem behavior finally appeared only in these combined-antecedent sessions.

Both clients showed problem behavior only when two triggers happened together.

When treatment matched this combined function, the behavior dropped.

The study shows that some behaviors need two sparks, not one, to ignite.

Jolliffe et al. (1999) warned that FA results can flip if you repeat the test weeks later.

That sounds like a clash, but the two papers ask different questions.

T et al. asked, "Are FA outcomes stable over time?" A et al. asked, "Can we make a silent FA speak up?"

Both can be true: run the combined-antecedent tweak today, yet still recheck function next month if behavior changes.

Tassé et al. (2013) reviewed ten years of tweaks like this one and found clinicians add odd antecedents all the time when standard FAs fail.

The 2005 paper gives a clean single-case example of that exact pattern.

If your FA graphs sit flat at zero, do not write "no function" in the report.

Add one session that pairs antecedents, such as interrupting a preferred task while also saying "do this worksheet."

If behavior finally shows up, you just saved weeks of guessing and prevented a false-negative mistake.