The effects of reversible inactivation of the red nucleus on learning-related and auditory-evoked unit activity in the pontine nuclei of classically conditioned rabbits

Author(s): Gohl, E. B., Singson, M., Lavond, D. G.

Journal/Book: Learn Memory. 1997; 3: 1 Bungtown Rd, Plainview, NY 11724. Cold Spring Harbor Lab Press. 519-531.

Abstract: The pontine nuclei carry auditory conditioned stimulus information to the cerebellum during classical conditioning of the nictitating membrane response in rabbits. In well-trained animals learning-related as well as stimulus-evoked unit activity can be recorded throughout the pontine nuclei but particularly in the lateral and dorsolateral pens. Recent work in our laboratory has provided evidence that the learning-related unit activity in the pens is dependent on the interpositus nucleus and that the pens is not a site of essential plasticity for the learned response. In the present study we considered the question of whether learning-related unit activity might be projected from the interpositus nucleus to the pens through the red nucleus, a primary output target of the interpositus and a structure known to be essential for expression of the learned response. Multiple Unit recordings were taken from lateral and dorsolateral pontine locations in well-trained rabbits before and during cooling of the red nucleus. Analysis of pooled data for all recording locations within the lateral and dorsolateral pens indicated that reversible inactivation of red nucleus abolished both stimulus-evoked and learning-related unit activity. However, we also found discrete recording locations where stimulus-evoked and learning-related Unit activity were attenuated but not abolished by red nucleus cooling.

Note: Article Cartford MC, Univ So Calif, Dept Psychol, Los Angeles,CA 90089 USA

Keyword(s): CEREBELLAR INTERPOSITUS NUCLEUS; NICTITATING-MEMBRANE; COCHLEAR NUCLEUS; HORSERADISH-PEROXIDASE; NEURONAL RESPONSES; MAMMALIAN BRAIN; EYELID RESPONSE; INFERIOR OLIVE; STIMULUS; LESIONS

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