Using eyeblink classical conditioning as a test of the functional consequences of exposure of the developing cerebellum to alcohol |
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Authors: | Email author" target="_blank">John?T?GreenEmail author |
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Institution: | (1) Department of Psychology, Indiana University, 1101 E. 10th Street, 47405-7007 Bloomington, IN |
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Abstract: | Exposure of the developing brain to alcohol produces profound Purkinje cell loss in the cerebellum, and deficits in tests
of motor coordination. However, the precise relationship between these two sets of findings has been difficult to determine.
Eyeblink classical conditioning is known to engage a discrete brainstem-cerebellar circuit, making it an ideal test of cerebellar
functional integrity after developmental alcohol exposure. In eyeblink conditioning, one of the deep cerebellar nuclei, the
interpositus nucleus, as well as specific Purkinje cell populations, are sites of convergence for CS and US information. A
series of studies have shown that eyeblink conditioning is impaired in both weanling and adult rats given binge-like exposure
to alcohol as neonates, and that these deficits can be traced, at least in part, to impaired activation of cerebellar interpositus
nucleus neurons and to an overall reduction in the deep cerebellar nuclear cell population. Because particular cerebellar
cell populations are utilized in well-defined ways during eyeblink conditioning, conclusions regarding specific changes in
the mediation of behavior by these cell populations are greatly strengthened. Further studies will be directed towards the
impact of early exposure to alcohol on the functionality of specific Purkinje cell populations, as well as towards brainstem
areas that process the tone CS and the somatosensory US. |
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