Stimulus control: part I.
Stimulus control grows through looking, so teach the eyes first and the reinforcers second.
01Research in Context
What this study did
Lyons (1995) wrote a theory paper. No kids. No pigeons. Just ideas.
The paper asks: what really creates stimulus control? The answer: watching the stimulus matters more than getting different pay-offs.
The author says we learn to tell two pictures apart because we look at them, not because one picture gives us candy and the other does not.
What they found
The big idea: the strength of stimulus control equals how often and how long the learner looks.
Differential reinforcement helps only if it makes the learner look more. If the learner already looks plenty, extra reinforcement adds little.
How this fits with other research
Older lab work seems to disagree. Badia et al. (1972) and Danforth et al. (1990) both show that differential reinforcement alone can build control in one or two sessions.
The papers do not really clash. The labs proved reinforcement can work. Lyons (1995) adds the lens: reinforcement works by boosting observing. No looking, no learning.
Grisante et al. (2024) extends the idea. They used an observing-response trick while teaching kids equivalence classes. Kids formed the classes even when they first scanned the wrong choices, showing that looking time, not just picking, drives control.
Why it matters
Next time a learner is stuck on a discrimination task, check eyes before you add more reinforcers. Place the cards closer, highlight the key part, or have the learner point and name. More looks usually beats bigger candy.
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02At a glance
03Original abstract
In his effort to distinguish operant from respondent conditioning, Skinner stressed the lack of an eliciting stimulus and rejected the prevailing stereotype of Pavlovian "stimulus-response" psychology. But control by antecedent stimuli, whether classified as conditional or discriminative, is ubiquitous in the natural setting. With both respondent and operant behavior, symmetrical gradients of generalization along unrelated dimensions may be obtained following differential reinforcement in the presence and the absence of the stimulus. The slopes of these gradients serve as measures of stimulus control, and they can be steepened without applying differential reinforcement to any two points along the test dimension. Increases and decreases in stimulus control occur under the same conditions as those leading to increases and decreases in observing responses, indicating that it is the increasing frequency and duration of observation (and perhaps also of attention) that produces the separation in performances during discrimination learning.
The Behavior analyst, 1995 · doi:10.1007/BF03392691