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Related Experiment Videos

Trace eyeblink conditioning is hippocampally dependent in mice.

W Tseng1, R Guan, J F Disterhoft

  • 1Department of Physiology, Institute for Neuroscience, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA.

Hippocampus
|April 3, 2004
PubMed
Summary

Trace eyeblink conditioning in mice requires the hippocampus for associative learning. Dorsal hippocampal neuron lesions impair conditioning, especially in area CA1, highlighting its role in this learning task.

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Learning and Memory

Background:

  • Eyeblink conditioning is a model system for studying associative learning.
  • The role of the hippocampus in trace eyeblink conditioning remains incompletely understood.

Purpose of the Study:

  • To investigate if trace eyeblink conditioning is a hippocampally dependent associative learning task in mice.
  • To determine the critical hippocampal subregions involved in trace eyeblink conditioning.

Main Methods:

  • Examined trace intervals (0, 250, 500 ms) in C57BL/6 mice.
  • Lesioned dorsal hippocampal neurons using ibotenic acid and assessed conditioned responses (CRs).
  • Analyzed lesion volume in CA1, CA3, and dentate gyrus in relation to behavioral impairment.

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Main Results:

  • Mice acquired CRs with 0-ms and 250-ms trace intervals, but showed little acquisition with a 500-ms interval.
  • Lesioning dorsal hippocampal neurons significantly impaired trace eyeblink conditioning (250-ms interval).
  • Lesion volume in area CA1 was most predictive of behavioral deficits.

Conclusions:

  • Dorsal hippocampal neurons are critical for trace eyeblink conditioning with a 250-ms interval in C57BL/6 mice.
  • This paradigm is valuable for studying hippocampal function in learning and memory.
  • Future research can utilize this model for in vivo and in vitro electrophysiological studies.