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Blocking observed in human eyelid conditioning.

I Martin1, A B Levey

  • 1Psychology Department, Institute of Psychiatry, London, U.K.

The Quarterly Journal of Experimental Psychology. B, Comparative and Physiological Psychology
|August 1, 1991
PubMed
Summary
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Human eyelid conditioning studies confirm the blocking phenomenon, where prior learning inhibits new conditioning. Variability in experiments impacted results, but overall evidence supports blocking in humans.

Area of Science:

  • Behavioral Psychology
  • Neuroscience
  • Human Learning

Background:

  • The blocking phenomenon, a key concept in associative learning, is well-established in animal models, particularly with rabbit nictitating membrane (NMR) studies.
  • Understanding blocking in humans is crucial for generalizing learning principles across species and informing cognitive models.

Purpose of the Study:

  • To investigate the presence and characteristics of the blocking phenomenon in human participants using eyelid conditioning.
  • To compare human eyelid conditioning results with established rabbit NMR findings.

Main Methods:

  • Four within-subjects experiments were conducted, involving discrimination, compound training, and testing phases.
  • Conditioned stimuli (CSs) were compared for blocked and non-blocked conditions across extinction trials or reinforced training.

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  • Subjective awareness of stimulus relations was assessed via post-experimental questionnaires.

    • Main Results:

    • Three of the four experiments provided evidence for the blocking effect when analyzing all extinction trials.
    • One experiment using a between-subjects design failed to demonstrate blocking, potentially due to high variability.
    • Subjective awareness measures did not correlate with conditioned responding or identify a subjective blocking effect.

    Conclusions:

    • The blocking phenomenon is demonstrable in human eyelid conditioning, aligning with findings in animal models.
    • Experimental design, particularly within-subjects comparisons and analysis of extinction trials, is critical for observing blocking.
    • Subjective awareness does not appear to be a reliable indicator of the blocking effect in this paradigm.