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J Neurophysiol 84: 2680-2690, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 84 No. 5 November 2000, pp. 2680-2690
Copyright ©2000 by the American Physiological Society

Cerebellar Posterior Interpositus Nucleus as an Enhancer of Classically Conditioned Eyelid Responses in Alert Cats

A. Gruart,1 G. Guillazo-Blanch,2 R. Fernández-Mas,3 L. Jiménez-Díaz,1 and J. M. Delgado-García1

 1División de Neurociencias, Laboratorio Andaluz de Biología, Universidad Pablo de Olavide, 41013 Sevilla;  2Departament de Psicobiologia i de Metodologia de les Ciències de la Salut, Facultat de Psicologia, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain; and  3División de Neurociencias, Instituto Mexicano de Psiquiatría, San Lorenzo Huipulco, 14370 México, DF, Mexico

Gruart, A., G. Guillazo-Blanch, R. Fernández-Mas, L. Jiménez-Díaz, and J. M. Delgado-García. Cerebellar Posterior Interpositus Nucleus as an Enhancer of Classically Conditioned Eyelid Responses in Alert Cats. J. Neurophysiol. 84: 2680-2690, 2000. Cerebellar posterior interpositus neurons were recorded in cats during delayed and trace conditioning of eyeblinks. Type A neurons increased their firing in the time interval between conditioned and unconditioned stimulus presentations for both paradigms, while type B neurons decreased it. The discharge of different type A neurons recorded across successive conditioning sessions increased, with slopes of 0.061-0.078 spikes/s/trial. Both types of neurons modified their firing several trials in advance of the appearance of eyelid conditioned responses, but for each conditioned stimulus presentation their response started after conditioned response onset. Interpositus microstimulation evoked eyelid responses similar in amplitude and profiles to conditioned responses, and microinjection of muscimol decreased conditioned response amplitude. It is proposed that the interpositus nucleus is an enhancer, but not the initiator, of eyelid conditioned responses.




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