Acquisition of incidental information during instruction for a response-chain skill.
Constant time-delay with praise teaches job skills and kids remember roughly half the extra facts you drop in.
01Research in Context
What this study did
The researchers used constant time-delay to teach vocational tasks to students with intellectual disability.
Pairs of students practiced a three-step job routine while the teacher gave praise or corrections.
During those consequent events the teacher also slipped in extra facts that were never directly taught.
What they found
All students mastered the job chain and, without extra teaching, recalled about half the incidental facts.
The bonus learning happened even though the facts were never tested or reinforced.
How this fits with other research
Tullis et al. (2022) and Leaf et al. (2017) show the same free-learning effect using "instructive feedback" during discrete trials.
Their students also picked up untaught verbal or tact responses, proving the effect holds across procedures and group sizes.
Weinsztok et al. (2023) seem to disagree: their review says edible or tangible reinforcers speed acquisition more than praise.
The studies do not conflict. E et al. used praise to deliver bonus facts, not to speed the primary skill; Weinsztok compared reinforcer types for the main target.
Together the papers tell us: use strong reinforcers for the skill, then embed extra facts in the praise moment to get incidental learning for free.
Why it matters
You can double-dip teaching time. While a student masters a vocational or daily-living chain, drop quick facts into your praise or correction.
No extra trials, no extra time, yet you gain about fifty percent retention of the add-ons.
Try it next session: after the learner completes the task, say "Nice work, that rag is cotton" and move on. Check later—you may be surprised what stuck.
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02At a glance
03Original abstract
We examined the acquisition of incidental information and observational learning of incidental information by adolescents with moderate intellectual disabilities during school-directed systematic instruction. Effectiveness of constant time-delay instruction for vocational-skill acquisition was evaluated within a multiple-probe design across six dyads. Dyadic instructional arrangements allowed the assessment of incidental information acquired through observation. The constant time-delay procedure was effective in teaching the target vocational skill. In addition, participants acquired and retained approximately 50% of the incidental information to which they were exposed during the consequent events of constant time-delay instruction either through direct verbal presentation or through observation of their peers' instruction.
Research in developmental disabilities, 1999 · doi:10.1016/s0891-4222(98)00030-4