Within-session changes in responding during concurrent variable-interval schedules

Article Abstract:

Two experiments with rats and pigeons show that responses within sessions change when reinforcement rates are equal to the sum of reinforcers from the concurrent schedules. The changes are similar to those in operant conditioning. The same variables may govern within session changes under different responding paradigms. Within session responses change similarly for the two components of each concurrent schedule, depending on the sum of reinforcers from both components, when they have similar reinforcers.

Psychological aspects, Behavior, Rats

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Within-session changes in key and lever pressing for water during several multiple variable-interval schedules

Article Abstract:

Rates of lever pressing were slower for schedules that presented low rates of reinforcements than those for higher reinforcement. Rates of key pressing increased with increases in the rates of reinforcements up to a point and then reduced with the subsequent increase in the rate in rats for the water reinforcer. For food reinforcers the within-session changes in lever and key pressing were smaller for lower rates, symmetrical near the middle range for lower than the higher rate of reinforcement.

Measurement, Physiological regulation, Biological control systems, Behavioral assessment

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Within-session changes in responding during concurrent schedules with different reinforcers in the components

Article Abstract:

The rate and time spent responding changes within sessions when rats respond to concurrent food-water schedules and pigeons respond to concurrent wheat-mixed grain schedule. Negative sensitivity is sometimes found in the concurrent food-water schedule sessions. Within-session variations in responding can lead to problems in measuring the validity of concurrent schedule responding.

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