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Stimulus definition in conditional discriminations.

I H Iversen, M Sidman, P Carrigan

Journal of the Experimental Analysis of Behavior

|May 1, 1986

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Monkeys learned matching-to-sample tasks. Changing stimulus locations disrupted line discrimination but not hue discrimination, suggesting location is key for some visual tasks.

Area of Science:

Behavioral neuroscience
Animal cognition

Background:

Matching-to-sample tasks assess stimulus control in animals.
Previous studies often used fixed stimulus locations.

Purpose of the Study:

To investigate how changing stimulus locations affect conditional discriminations in rhesus monkeys.
To determine if spatial location is a critical feature in identity-matching tasks.

Main Methods:

Two rhesus monkeys were trained on an identity-matching procedure with hue and line stimuli.
Stimulus locations were initially fixed and later varied across three response keys.
Response accuracy to hue and line stimuli was recorded under both conditions.

Main Results:

Varying stimulus locations disrupted the control exerted by line features.

Related Experiment Videos

Conditional hue discrimination remained intact despite changes in stimulus location.

Monkeys' responses were less influenced by line orientation when locations varied.

Conclusions:

Spatial location is a significant factor in stimulus control for certain visual discriminations.
Hue discrimination is less dependent on spatial location compared to line orientation.
Future studies should specify stimulus locations when describing controlling stimuli in matching tasks.