fMRI of the Conscious Rabbit during Unilateral Classical Eyeblink Conditioning Reveals Bilateral Cerebellar Activation

Michael J. Miller, Nan Kuei Chen, Limin Li, Brian Tom, Craig Weiss, John F. Disterhoft, Alice M. Wyrwicz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


The relative contributions of the ipsilateral and contralateral cerebellar cortex and deep nuclei to delay eyeblink conditioning have been debated and are difficult to survey entirely using typical electrophysiological and lesion techniques. To address these issues, we used single-event functional magnetic resonance imaging (fMRI) in the conscious rabbit to visualize the entire cerebellum simultaneously during eyeblink conditioning sessions. Examination of the blood oxygenation level-dependent (BOLD) response to a visual conditioning stimulus early in training revealed significant bilateral learning-related increases in the BOLD response in the anterior interpositus nucleus (IPA) and significant bilateral deactivation in hemispheric lobule VI (HVI) of the cerebellar cortex. Later in training, the BOLD response remained bilateral in the cortex and predominantly ipsilateral in the IPA. Conditioning stimulus-alone trials after conditioning revealed that both sides of HVI were affected similarly but that only the ipsilateral interpositus nucleus was activated. These results suggest that both sides of HVI normally influence the side of the IPA being conditioned and illustrate how fMRI can be used to examine multiple brain regions simultaneously in an awake, behaving animal to discover more rapidly the neural substrates of learning and memory.

Original languageEnglish (US)
Pages (from-to)11753-11758
Number of pages6
JournalJournal of Neuroscience
Issue number37
StatePublished - Dec 17 2003


  • Cerebellum
  • Eyeblink conditioning
  • Laterality
  • Learning
  • Memory
  • Rabbit
  • fMRI

ASJC Scopus subject areas

  • General Neuroscience


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