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The Journal of Neuroscience, December 17, 2003, 23(37):11753-11758

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

Michael J. Miller,^1,2 Nan-kuei Chen,² Limin Li,^2,3 Brian Tom,² Craig Weiss,^4,5 John F. Disterhoft,^4,5 and Alice M. Wyrwicz^2,3,5

¹Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60201, ²Center for Basic Magnetic Resonance Research, Evanston Northwestern Healthcare Research Institute, Evanston, Illinois 60201, and Departments of ³Radiology and ⁴Physiology and ⁵Institute for Neuroscience, Feinberg Medical School, Northwestern University, Chicago, Illinois 60611

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.

Key words: fMRI; eyeblink conditioning; cerebellum; rabbit; learning; memory; laterality

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Received June 4, 2003; revised October 1, 2003; accepted October 24, 2003.

This article has been cited by other articles:

				D. T. Cheng, J. F. Disterhoft, J. M. Power, D. A. Ellis, and J. E. Desmond Neural substrates underlying human delay and trace eyeblink conditioning PNAS, June 10, 2008; 105(23): 8108 - 8113. [Abstract] [Full Text] [PDF]

				M. J. Miller, C. Weiss, X. Song, G. Iordanescu, J. F. Disterhoft, and A. M. Wyrwicz Functional Magnetic Resonance Imaging of Delay and Trace Eyeblink Conditioning in the Primary Visual Cortex of the Rabbit J. Neurosci., May 7, 2008; 28(19): 4974 - 4981. [Abstract] [Full Text] [PDF]

				J.-S. Park, T. Onodera, S.-i. Nishimura, R. F. Thompson, and S. Itohara Molecular evidence for two-stage learning and partial laterality in eyeblink conditioning of mice PNAS, April 4, 2006; 103(14): 5549 - 5554. [Abstract] [Full Text] [PDF]

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