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Within-session patterns in variable-interval schedule performance: Variation with deprivation level.

Jonathan W Pinkston¹, Kathryn Saulsgiver, Marc N Branch

¹Psychology Building, University of Florida, Gainesville, FL 32611, United States. pinkston@ku.edu

Behavioural Processes

|April 21, 2007

Summary

Experimental practices like food deprivation significantly impact operant responding patterns. Controlling deprivation is crucial for accurate interpretation of within-session changes in pigeons.

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Area of Science:

Behavioral psychology
Animal behavior studies

Background:

Operant responding patterns can change within experimental sessions.
Interpretation of these changes is debated due to unstated experimental practices, particularly regarding deprivation operations.

Purpose of the Study:

To investigate the influence of deprivation operations on within-session changes in operant responding.
To gather descriptive data on how deprivation affects observed behavioral patterns.

Main Methods:

Four food-deprived pigeons were studied under a multiple variable-interval schedule.
Two conditions were used: Condition I with a session-entry body weight criterion, and Condition II without this criterion.

Main Results:

Stable within-session responding was observed when a session-entry criterion was enforced.
Removing the criterion led to increased body weight and decreased food intake, resulting in robust within-session changes in three of four pigeons.

Conclusions:

Rich reinforcement schedules can reduce deprivation levels, requiring days to reverse.
Future research must tightly control and report deprivation measures to ensure replicability and accurate interpretation of results.