[Dynamics of the activity of cerebellar Purkinje cells induced by changes in the duration of complex spikes].

The relationship between complex and simple spikes of Purkinje cells from vermis cerebelli of guinea pigs has been investigated. The ratio of complex spikes innervated by the processes of one and the same liana-like fiber ("twins cells") has also been studied. Three types of complex spikes in each Purkinje cell from vermis cerebelli of guinea pigs (n = 44) have been differentiated, which differ in duration.

[Characteristics of activity of "fast" and "slow" Purkinje cells of the cerebellum].

In the guinea pig cerebellar cortex, three types of Purkinje cells were identified according to the properties of complex spikes: fast, intermediate, and slow cells. Fast Purkinje cells have following properties as compared with slow Purkinje cells: (i) salient components with short intervals in complex impulses (on the average, five components with a period of about 2 ms versus two components with a period of about 4 ms); (ii) a short duration of simple spikes (in the average, 2.13 +/- 0.

[Activity of the climbing fiber innervating various Purkinje cells].

Low-amplitude potentials (10-130 microV) related to the action of a distant branch of the climbing fiber, which elicits complex spikes of the reference Purkinje cell were revealed by means of potential averaging synchronously with complex spikes of Purkinje cells in 10 out of 255 paired records of cerebellar Purkinje cells activity and extracellular field potentials at interelectrode distances of 200-1500 microns. These potential waves had a stable form in independent sets of data. In 3 out of 10 cases, the low-amplitude potentials included a slow (about 100 ms in duration) component.

Cross-correlation analysis of neuron connections in the cerebellum of conscious rabbits.

Cross-interval and cross-correlation analysis of neuron activity was used to study cell interactions in the cerebellar vermis of conscious rabbits. The cross-correlation method, based on post-synaptic potentials (PSP) from one member of a pair of neurons, supplements the cross-interval analysis used for evaluating the interactions of neurons in terms of action potentials. A total of 16 neuron pairs were analyzed, in which the activity of one neuron was recorded intracellularly and that of the other extra- or intracellularly.

[Cross-correlational analysis of the neuronal connections of the cerebellum in the waking rabbit].

The methods of cross-interval and crosscorrelation analysis were used to study interneuronal connections in cerebellar vermis in awake rabbit. Crosscorrelation, or spike-triggering method, complemented the analysis of cross-intervals which estimated the neuronal interaction comparing spike sequences as point processes. Among 16 neuronal pairs recorded intra- or extracellularly 10 pairs were considered as interconnected.