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Does conditional discrimination learning by pigeons necessarily involve hierarchical relationships?

D R Thomas, E K Schmidt

Journal of the Experimental Analysis of Behavior

|November 1, 1989

Summary

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Conditional and discriminative cues presented together in reversal procedures blur their individual functions. Pigeons

Area of Science:

Behavioral psychology
Animal cognition
Stimulus control

Background:

Conditional and discriminative cues play distinct roles in learning.
The single reversal procedure presents these cues simultaneously.

Purpose of the Study:

To investigate the functional relationship between conditional and discriminative cues.
To determine if unique functions can be ascribed to each cue type in simultaneous presentations.

Main Methods:

Pigeons were trained on discriminations involving key color and houselight conditions.
Testing involved generalization gradients across varying stimulus combinations.

Main Results:

Simultaneous presentation of cues prevented unique functional attribution.

Related Experiment Videos

Bidimensional generalization gradients indicated interactions between cue types.

Performance remained stable when training procedures were switched.

Conclusions:

The hierarchical relationship between conditional and discriminative stimuli needs reevaluation.
A symmetrical relationship may better describe cue interactions, or the hierarchical model should be abandoned.