Conditioned reinforcement and discrimination performance.
A brief stimulus paired with food can lift discrimination accuracy, especially when food is scarce.
01Research in Context
What this study did
The team worked with pigeons in a lab.
They wanted to know if a short light or sound could become a reinforcer.
The light was paired with food now and then.
Birds then picked between two keys to test if the light helped them choose better.
What they found
The brief light raised choice accuracy.
The gain was biggest when food came only once in a while.
When food was already frequent, the light added little.
How this fits with other research
James et al. (1981) saw the opposite.
Their food-paired brief cues slowed pigeons’ key pecking.
The clash is real: same species, same cue type, but one boosts accuracy, the other cuts rate.
The key gap is the task.
A et al. used a discrimination task; L used a fixed-ratio task.
Cues may help you choose right but drag on rapid repeating.
Kendall (1974) backs the idea that signals make lean schedules okay.
Pigeons picked the key that gave less food as long as a signal flashed when food was due.
Together the papers say: conditioned reinforcers work, but watch the response type you ask for.
Why it matters
When you thin reinforcement, add a quick praise word or click that you have paired with treats.
Use it during discrimination drills, not during long repetitive chains.
That split keeps accuracy up without slowing the whole session.
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02At a glance
03Original abstract
Pigeons were trained in a three-key chamber to peck one side key in the presence of a vertical line on the center key and to peck the other side key in the presence of a horizontal line. Correct choice responses were reinforced with food according to fixed- and variable-ratio, fixed-interval, and differential-reinforcement-of-long-latency schedules of reinforcement. For each schedule, the birds performed under each of two conditions: (1) each correct choice response produced a brief presentation of stimuli intermittently paired with food, then the next trial; (2) each correct choice response produced an intertrial interval only. For all schedules except one long latency schedule, response rates were higher under the condition of brief stimulus presentation than under the comparable control condition. Presentation of brief magazine stimuli increased choice accuracy. The amount of change in accuracy was correlated with the rate of food presentation. Performance under the schedules with highest food reinforcement rates showed no enhancement; performance under the schedules with the lowest reinforcement rates showed the greatest enhancement.
Journal of the experimental analysis of behavior, 1970 · doi:10.1901/jeab.1970.14-23