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Related Experiment Videos

Reflex modification in the electrodermal system: conceptual and methodological issues.

M A Flaten1, K Hugdahl

  • 1Department of Somatic Psychology, University of Bergen, Norway.

Biological Psychology
|February 1, 1990
PubMed
Summary

Reflex modification (RM) can be affected by changes in experimental procedures and stimulus habituation. Repeated stimulus pairing reduced RM strength, suggesting habituation of the orienting response to the initial stimulus.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Experimental Psychology

Background:

  • Reflex modification (RM) involves altering a reflex response with a preceding stimulus (S1).
  • Potential confounds in RM research include orienting responses and habituation.
  • The influence of classical conditioning on RM strength requires investigation.

Purpose of the Study:

  • To determine if changes in experimental procedure or stimulus habituation confound reflex modification.
  • To assess whether classical conditioning, through repeated S1-S2 pairing, influences RM strength.

Main Methods:

  • Two groups (A and B) received S2-alone and S1-S2 stimulus presentations in different orders.
  • Group A: 10 S2-alone, then 10 S1-S2. Group B: 10 S1-S2, then 10 S2-alone.

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  • This design allowed for comparison of unconfounded vs. confounded RM and learning effects.

    • Main Results:

    • Reflex modification was influenced by orienting responses to procedural changes.
    • RM strength decreased with repeated S1-S2 pairings, indicating habituation of the orienting response to S1.
    • The order of stimulus presentation affected the observed RM.

    Conclusions:

    • Reflex modification is susceptible to confounding factors like orienting and habituation.
    • Habituation of the orienting response to the initial stimulus plays a role in RM.
    • RM shows potential for objectively studying complex cognitive processes.