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Pavlovian conditional stimuli cannot always be defined solely in physical terms.

H Lachnit1, W Pieper, A Hilpert

  • 1Justus-Liebig-Universität Giessen, West Germany.

The Pavlovian Journal of Biological Science
|October 1, 1988
PubMed
Summary

Pavlovian conditioning with colored stimuli showed that identical white compounds, created by additive color mixing, did not elicit different responses despite distinct conditioning histories. This suggests internal processes, not just physical stimuli, define conditioning outcomes.

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Area of Science:

  • Psychology
  • Cognitive Science
  • Neuroscience

Background:

  • Differential Pavlovian conditioning involves associating stimuli with outcomes.
  • Additive color mixture can create physically distinct stimuli that appear identical.

Purpose of the Study:

  • To investigate if distinct conditioning histories influence responses to identical stimuli created via additive color mixture.
  • To examine the role of internal processes versus physical stimulus properties in conditioning.

Main Methods:

  • Twenty-four university students underwent differential Pavlovian conditioning with shock-associated and non-associated colored stimuli.
  • Complementary colored stimuli were additively mixed to form identical white compound stimuli.
  • Skin-conductance responses were measured to assess differential conditioning effects.

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Main Results:

  • Despite different conditioning histories, the two identical white compound stimuli did not elicit significantly different skin-conductance responses.
  • The responses to the compound stimuli resembled habituation or extinction, rather than differential conditioning.

Conclusions:

  • The definition of a conditional stimulus solely as a physical event is insufficient.
  • Identical internal processes or phenomenological experiences can arise from physically different stimuli, impacting conditioning outcomes.
  • This finding is particularly relevant for phenomena like additive color mixture.