Abstract
In rabbit cerebellar cortex, local stimulation of parallel fibers induced field potentials with two negative peaks, n 1 representing conducting spikes of parallel fibers and n 2 postsynaptic excitation in dendrites of Purkinje cells and other cortical cells. Conjunctive stimulation of parallel fibers and climbing fibers at 4 Hz for 30–120 sec caused a significant depression of n 2 potential which lasted for at least 1 h. Such an effect could not be produced by stimulation of climbing fibers or parallel fibers alone. These observations support the plasticity assumption in the Marr-Albus model of the cerebellum.
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