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Related Experiment Videos

Neural substrates mediating human delay and trace fear conditioning.

David C Knight1, Dominic T Cheng, Christine N Smith

  • 1Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 13, 2004
PubMed
Summary

This study reveals overlapping brain activity in Pavlovian fear conditioning, with distinct regions like the hippocampus supporting trace conditioning by processing temporal information.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Pavlovian fear conditioning involves forming associations between stimuli.
  • Delay conditioning (CS-UCS overlap) and trace conditioning (CS-UCS gap) have distinct neural underpinnings.
  • Understanding trace conditioning's neural basis is crucial for complex learning.

Purpose of the Study:

  • To directly compare the neural substrates of delay and trace fear conditioning using event-related fMRI.
  • To identify brain regions specifically involved in trace interval processing.
  • To elucidate the role of the hippocampus in temporal coding during trace conditioning.

Main Methods:

  • Event-related functional magnetic resonance imaging (fMRI) in human subjects.
  • Simultaneous recording of skin conductance and unconditioned stimulus (UCS) expectancy.

Related Experiment Videos

  • Direct comparison of delay and trace discrimination learning paradigms.

    • Main Results:

    • Shared activation in visual cortex, anterior cingulate, and medial thalamus for both conditioning types.
    • Trace conditioning uniquely recruited the supplementary motor area (SMA), frontal operculum, middle frontal gyri, and inferior parietal lobule.
    • Hippocampal activation correlated with prediction accuracy, suggesting a role in temporal coding.

    Conclusions:

    • Trace conditioning recruits additional brain regions beyond those involved in delay conditioning.
    • The hippocampus appears critical for coding temporal information during the trace interval.
    • Working memory networks likely maintain conditioned stimulus-unconditioned stimulus representations during trace conditioning.