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Related Experiment Video

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Trace Fear Conditioning in Mice
07:02

Trace Fear Conditioning in Mice

Published on: March 20, 2014

Human trace fear conditioning: right-lateralized cortical activity supports trace-interval processes.

Abhishek T Haritha1, Kimberly H Wood, Lawrence W Ver Hoef

  • 1Department of Biology, University of Alabama at Birmingham, Birmingham, AL, USA.

Cognitive, Affective & Behavioral Neuroscience
|December 25, 2012
PubMed
Summary

This study used fMRI to identify brain regions involved in trace conditioning. It found that the prefrontal cortex, insula, and parietal regions are crucial for maintaining representations during the trace interval, with a right-lateralized circuit playing a key role.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Learning and Memory

Background:

  • Pavlovian conditioning typically requires simultaneous conditioned stimulus (CS) and unconditioned stimulus (US) activation.
  • Trace conditioning involves a temporal gap between CS and US, necessitating neural mechanisms to bridge this interval.
  • Understanding brain regions that maintain CS representations during the trace interval is critical for associative learning research.

Purpose of the Study:

  • To differentiate brain activity related to the trace CS from activity during the trace interval in trace conditioning.
  • To identify specific brain regions supporting associative learning during distinct phases of a trace conditioning trial.
  • To investigate the role of the prefrontal cortex, insula, and parietal regions in trace conditioning processes.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to measure hemodynamic responses during a trace conditioning task.
  • The study design aimed to disentangle neural activity elicited by the trace CS from that occurring during the trace interval.
  • Analysis focused on identifying learning-related activation within specific cortical and subcortical brain regions.

Main Results:

  • Learning-related activity during the trace CS was observed in dorsomedial prefrontal cortex (PFC), dorsolateral PFC, insula, inferior parietal lobule (IPL), and posterior cingulate (PCC).
  • Trace interval activity was localized to a subset of these regions, including dorsomedial PFC, PCC, right dorsolateral PFC, right IPL, right superior/middle temporal gyrus, and bilateral insula.
  • Trace-interval activity showed greater activation in the right hemisphere compared to the left in dorsolateral PFC, IPL, and superior/middle temporal gyrus, suggesting a right-lateralized fronto-parietal circuit.

Conclusions:

  • Components of the prefrontal, cingulate, insular, and parietal cortices are involved in supporting trace-interval processes during associative learning.
  • A right-lateralized fronto-parietal network may play a distinct and significant role in the mechanisms underlying trace conditioning.
  • These findings advance our understanding of the neural basis of associative learning, particularly in tasks requiring temporal integration of stimuli.