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Local contrast and maintained generalization

J M Hinson, J C Malone

Journal of the Experimental Analysis of Behavior

|November 1, 1980

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Pigeons showed altered peck rates based on line orientation stimuli, with contrast effects fading over time. These findings offer insights into stimulus control and generalization gradients in animal behavior.

Area of Science:

* Behavioral Psychology
* Animal Cognition
* Perception and Learning

Background:

* Investigating stimulus control and generalization gradients is crucial for understanding learning processes.
* Negative contrast effects, where stimuli predict non-reinforcement, can influence behavior in complex ways.

Purpose of the Study:

* To examine how pigeons' key pecking behavior is affected by line-orientation stimuli under variable-interval reinforcement.
* To investigate the role of sequential and local contrast in shaping generalization gradients during discrimination learning.

Main Methods:

* Pigeons were trained on a key pecking task with reinforcement for horizontal and vertical lines, and extinction for intermediate orientations.
* Peck rates were recorded across various line orientations to analyze generalization gradients and contrast effects.

Related Experiment Videos

* Stimulus presentations and reinforcement schedules were systematically varied to observe behavioral changes.

Main Results:

* Negative contrast shoulders were observed, with lower peck rates for stimuli adjacent to positive orientations.
* Peck rates in neighboring orientations shifted in opposite directions when positive orientations were manipulated.
* Contrast shoulders diminished with prolonged training, and local contrast correlated with stimulus similarity and discrimination stage.

Conclusions:

* Sequential local contrast appears to influence the formation of generalization gradients during discrimination learning.
* While Blough's model predicts gradient form changes, it may not fully capture the underlying behavioral processes.
* The study highlights the dynamic nature of stimulus control and contrast effects in learned behaviors.