Effects of preference on the emergence of untrained verbal operants.

The team taught four kids to name, or tact, six items. Three items were high-preference toys. Three were low-preference toys.

They used simple discrete-trial training. The adult held up an item and said, "What is this?" Correct answers got praise and a small edible.

After naming was solid, they tested if the kids would ask for, or mand, each item. No extra teaching happened before the mand test.

Kids immediately asked for every high-preference item they could already name.

Not one child asked for the low-preference items. Naming did not turn into asking when the item was only mildly liked.

Preference, not just naming skill, controlled whether the new mand popped out.

Meier et al. (2012) showed that teaching either mand or tact usually creates the other. Their three autistic children gained the untrained operant in days. Alysia’s kids did too, but only for highly preferred items. The difference is the 2012 paper never screened item preference.

Lancioni et al. (2009) also got emergent tacts after mand training, yet they had to change the antecedent prompt to see the effect. Alysia’s study flips the direction—tact to mand—and adds a clear rule: if the child does not want the item, the mand will not appear, prompt or no prompt.

Hu et al. (2023) later repeated the emergence idea with Chinese-speaking preschoolers learning English. Emergence still worked, backing up the core finding. Their data, however, did not split items by preference, so the new wrinkle here—preference gates emergence—remains a useful caution.

Before you assume that naming an item will automatically give a child the ability to ask for it, run a quick preference check. Spend two minutes letting the child play with potential items and rank them. Then teach tacts only for the top picks if your goal is spontaneous manding. This small step saves hours of extra teaching and keeps you from wondering why "he can say it but never asks for it."