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Trace eyeblink conditioning in patients with cerebellar degeneration: comparison of short and long trace intervals

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Abstract

To elucidate whether the cerebellar cortex may contribute to trace eyeblink conditioning in humans, eight patients with degenerative cerebellar disorders (four with sporadic adult onset ataxia, three with autosomal dominant cerebellar ataxia type III and one with spinocerebellar ataxia type 6) and eight age- and sex-matched healthy control subjects were investigated. Individual high resolution three-dimensional MRI data sets were acquired. As revealed by volumetric measurements of the cerebellum using ECCET software, patients showed cerebellar atrophy to various degrees. No abnormalities were observed in the control subjects. Eyeblink conditioning was performed twice using a tone of 40 ms as conditioned stimulus, followed by a short (400 ms) and a long (1,000 ms) trace interval and an air-puff of 100 ms as unconditioned stimulus. Using the short trace interval, eyeblink conditioning was significantly impaired in cerebellar patients compared to controls, even in those who fulfilled criteria of awareness. Using the long trace interval no significant group differences could be observed. The present findings of impaired trace eyeblink acquisition in patients with cortical cerebellar degeneration suggest that the cerebellar cortex in humans, in addition to the interposed nucleus, is involved in trace eyeblink conditioning, if the trace interval is relatively short. Using a long trace interval, the cerebellum appears to be less important.

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Acknowledgments

We would like to thank Dr. Albena Dimitrova for performance and analysis of brain imaging and Beate Brol for her help in eyeblink data analysis and preparation of the figures. The study was supported by a grant of the Bernd Fink Foundation.

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Correspondence to M. Gerwig.

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Gerwig, M., Eßer, A.C., Guberina, H. et al. Trace eyeblink conditioning in patients with cerebellar degeneration: comparison of short and long trace intervals. Exp Brain Res 187, 85–96 (2008). https://doi.org/10.1007/s00221-008-1283-2

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  • DOI: https://doi.org/10.1007/s00221-008-1283-2

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