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Classical conditioning, awareness, and brain systems.

Robert E. Clark1, Joseph R. Manns, Larry R. Squire

  • 1Dept of Psychiatry, University of California, San Diego, USA

Trends in Cognitive Sciences
|December 12, 2002
PubMed
Summary
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Awareness is crucial for trace conditioning, a type of memory involving the hippocampus and neocortex, but not for delay conditioning, which relies on the cerebellum and brainstem. This highlights distinct brain systems supporting different memory abilities.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Behavioral Neuroscience

Background:

  • Memory comprises diverse abilities supported by distinct neural systems.
  • Eyeblink classical conditioning is a well-studied model for understanding memory, particularly the distinction between declarative (conscious) and nondeclarative (non-conscious) memory.
  • Delay conditioning, dependent on the cerebellum and brainstem, remains intact in amnesia.

Purpose of the Study:

  • To investigate the role of awareness in differentiating between delay and trace eyeblink conditioning.
  • To elucidate the neural substrates underlying these two forms of classical conditioning.
  • To explain why awareness is essential for trace conditioning but not for delay conditioning.

Main Methods:

  • Comparison of delay and trace eyeblink conditioning paradigms.

Related Experiment Videos

  • Assessment of conditioning performance in individuals with and without amnesia.
  • Exploration of the impact of awareness on conditioning outcomes.
  • Analysis of brain system involvement (cerebellum, brainstem, hippocampus, neocortex).

    • Main Results:

    • Trace conditioning, unlike delay conditioning, is impaired in amnesia, indicating a reliance on the hippocampus and neocortex.
    • Recent studies emphasize the differential role of awareness in these conditioning types.
    • Awareness appears critical for trace conditioning but not for delay conditioning.

    Conclusions:

    • The findings underscore the distinct neural pathways and cognitive requirements for delay and trace conditioning.
    • Awareness plays a pivotal role in hippocampal- and neocortical-dependent trace conditioning.
    • Understanding these distinctions advances our knowledge of memory systems and their relation to consciousness.