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Inhibitory stimulus control in concurrent schedules.

I L Beale, A S Winton

Journal of the Experimental Analysis of Behavior

|September 1, 1970

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Pigeons showed U-shaped gradients in responding and time spent with stimuli when a changeover key controlled visual displays. Absolute response rates, however, remained unsystematic regardless of the changeover key

Area of Science:

Behavioral psychology
Animal cognition

Background:

Pigeons were trained to peck a main key under a variable-interval schedule.
The main key displayed a blue background, sometimes with a vertical line, and reinforcement depended on the stimulus.

Purpose of the Study:

To investigate stimulus generalization in pigeons.
To examine the effect of a changeover key on response gradients.

Main Methods:

Six pigeons were exposed to a main key and a changeover key.
Generalization tests involved presenting six line orientations on the main key without reinforcement.
Two conditions were tested: one with the changeover key operative, and one where the experimenter controlled stimulus changes.

Main Results:

Related Experiment Videos

U-shaped gradients were observed in both response rates and time spent with stimuli when the changeover key was operative.
These U-shaped gradients were not consistently observed in absolute response rates, irrespective of the changeover key's status.

Conclusions:

The changeover key influences stimulus generalization patterns in pigeons.
Response measures like time spent may be more sensitive to stimulus generalization than absolute response rates in this paradigm.