High-probability stimulus control topographies with delayed S+ onset in a simultaneous discrimination procedure.
A five-second heads-up before the right picture appears quickly lifts visual discrimination in adults with severe ID.
01Research in Context
What this study did
Three adults with severe intellectual disability tried to pick the correct picture from a pair.
The team added a five-second pause before the correct picture appeared.
They used an ABAB design: baseline, delay, back to baseline, then delay again.
What they found
During the five-second wait rule, all three adults picked the right picture more often.
When the pause was removed, accuracy dropped again.
The simple delay gave their eyes time to notice the right cue.
How this fits with other research
O’Neill et al. (2022) also played with timing, but in expressive labeling. They showed a progressive prompt delay beat both 2-s and 5-s fixed delays.
The two studies look opposite: fixed 5-s helped here, yet hurt there. The gap is task type. J et al. used the delay to sharpen visual noticing; O’Neill used it to cue spoken answers. Same clock, different jobs.
Esposito et al. (2021) used color cards to cut vocal stereotypy, again showing that small stimulus tweaks can flip behavior. All three papers say: control the cue, control the response.
Why it matters
If a learner keeps picking the wrong picture, insert a short pause before the correct choice pops up. No extra prompts, no new materials—just five seconds of blank screen. Try it during matching, shopping, or sight-word tasks. One setting change may save dozens of error corrections.
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02At a glance
03Original abstract
Experimenters and teachers use discrimination learning procedures to encourage reliable attending to stimulus differences defined as relevant for their purposes. Put another way, the goal of discrimination training is to establish high-probability stimulus control topographies that are coherent with experimenter or teacher specifications. The present research was conducted to investigate a novel procedure for encouraging stimulus control topography coherence. Participants were 13 adolescents with severe intellectual handicaps. During an initial Condition A, all were exposed to a simultaneous discrimination procedure. Participants could select a form alternating with a black field (S+) or an identical form that did not alternate (S-). Accuracy scores were typically low, and there was little evidence of coherent stimulus control topographies. Subsequently, the procedure was changed. During Condition B, every trial initially presented two identical nonalternating S- forms (Trial State 1). If the participant made no selection for 5 s, one of the forms began to alternate with the black field, and he or she could make the S+/S- discrimination (Trial State 2). Selections during Trial State I prolonged the delay to Trial State 2 until there had been no response for 5 s. During Condition B, S+/S- discrimination accuracy scores improved rapidly and markedly for most participants. Reinstating Condition A often resulted in diminished accuracy scores. This study thus (a) demonstrated a novel procedure for encouraging stimulus control topography coherence and (b) provided support for the interpretation that intermediate accuracy scores may be due to different topographies of stimulus control that co-occur in the same discriminative baseline.
Journal of the experimental analysis of behavior, 2002 · doi:10.1901/jeab.2002.77-189