Reinforcement of eye movement with concurrent schedules.
Concurrent VI plus a changeover delay can sculpt where humans look, proving the matching law works for eyes.
01Research in Context
What this study did
Schroeder et al. (1969) asked adults to move their eyes between two spots on a screen.
Each spot paid points on its own variable-interval schedule. A 3-s changeover delay stopped rapid switching.
The team tracked where the eyes went and for how long.
What they found
Eye time matched the pay rates. More points on the left meant more gaze time on the left.
The delay cut crossover glances. People stayed on the richer side longer.
How this fits with other research
Frederiksen et al. (1978) saw the same matching in rats that pressed levers to avoid shocks. The law holds across species and reinforcers.
Ohan et al. (2015) later used quiet-eye training to help clumsy kids catch balls. Eye shaping moved from lab trick to real skill.
Tiadi et al. (2014) seems to disagree. They found dyslexic children make slower, wonky vertical eye jumps. The key difference: the 1969 adults were neurotypical and reinforcement was available; the 2014 kids had dyslexia and no reinforcement program. Eye movements can be taught, but baseline deficits must be checked first.
Why it matters
If you run vision or reading programs, think in concurrent schedules. Reinforce looking at the text with fast praise or tokens. Add a short changeover delay so the learner sticks with the page instead of flicking around. The same rule that shaped eye position in 1969 can build longer looks at flashcards, books, or safety signs today.
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02At a glance
03Original abstract
Human macrosaccadic eye movements to two areas of a four-dial display were conditioned by concurrent variable-interval schedules of signals. Reinforcers (signals) were delivered to the two right-hand dials on one schedule and to the two left-hand dials on another, independent schedule. The use of a changeover delay between crossover eye movements and reinforcement had the effect of changing the pattern of scanning from fixating four dials in succession or in a Z-shaped pattern to scanning vertically the dials on either side with fewer crossovers. In the presence of a changeover delay, subjects matched relative eye-movement rates and relative reinforcement rates on each schedule. Rate of crossover eye movements, with a changeover delay in effect, was also inversely related to the difference in reinforcements arranged by the concurrent schedules. The results suggest that for stimuli whose critical components are arranged spatially, conditioned eye movements play an important part in selective stimulus control.
Journal of the experimental analysis of behavior, 1969 · doi:10.1901/jeab.1969.12-897