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Related Experiment Video

Updated: May 9, 2026

Pavlovian Conditioned Approach Training in Rats
06:57

Pavlovian Conditioned Approach Training in Rats

Published on: February 4, 2016

Why don't guiding cues always guide in behavior chains?

Alliston K Reid1, Hannah F Rapport, Thien-An Le

  • 1Department of Psychology, Wofford College, 429 N. Church Street, Spartanburg, SC, 29303, USA, reidak@wofford.edu.

Learning & Behavior
|July 13, 2013
PubMed
Summary
This summary is machine-generated.

Rats showed an overshadowing effect in learning a lever-press sequence, where environmental cues dominated over cues from their own actions. Prior experience significantly altered how rats adapted to changing stimulus conditions.

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Area of Science:

  • Behavioral neuroscience
  • Animal learning and behavior

Background:

  • Stimulus control is crucial for mastering behavioral skills.
  • Environmental cues can overshadow cues generated by an animal's own actions.

Purpose of the Study:

  • To replicate and assess the overshadowing effect in rats learning a sequential lever-press task.
  • To investigate the asymmetry in adapting to changing stimulus conditions.
  • To explore the influence of prior exposure on stimulus control.

Main Methods:

  • Four experiments were conducted using rats trained on a left-right lever-press sequence.
  • Stimulus control was assessed using predictive environmental cues (panel lights) and practice cues.
  • ABA design was employed to evaluate the impact of prior exposure.

Main Results:

  • A powerful asymmetry was observed: rats adapted to reversed-lights → lights but not lights → reversed-lights transitions.
  • Prior exposure to a stimulus condition reversed the effects of subsequent transitions.
  • Acquisition rates were influenced by the type of stimulus condition.

Conclusions:

  • Environmental cues can exert dominant control, overshadowing practice-generated cues in behavioral chains.
  • Feature-positive bias and spatial stimulus-response compatibility may explain cue insensitivity.
  • Perfectly predictive cues do not always guide behavior acquisition or performance.