The excitatory and inhibitory tetanic and post-tetanic changes of lateral vestibular nucleus (LVN) of Deiters' single neurons pulse flow frequency activity evoked by high frequency stimulation of hypothalamic Paraventricular (PVN) and Supraoptic (SON) nuclei was revealed. Depressor effects might be assumed of both true inhibitory and/or disfacilitatory origin. Producing depression from the brain higher endocrine centers is important for prevention of possible intensification of vestibular tonus alongside with exclusion of flexor-extensor balance, which is controlled by motor centers of the brain. The existence of excitatory reaction indicates to delicate regulatory action of PVN and SON to LVN as well. By means of Ca2+-dependent acidic phosphate method there were shown big polygonal LVN neurons, with dichotomized distant branching from the cell body and high activity of enzymes in dendrites and around the nucleus. By horseradish peroxydase (HRP) transport method the retrograde labeled large cells were shown in the medial and ventral parts of SON. Projecting to LVN small labeled source-cells unlike the large cells were predominantly revealed in dorsal and medial divisions of PVN. There were also found transient and anterograde marked preterminals The direct bilateral connections of LVN with PVN and SON indicate that LVN acts not only as an integrative structure, coordinating and controlling different motor actions concerned with regulation of posture and orientation in space, but is also involved in the processes of central regulation on autonomic functions.

Rats underwent unilateral labyrinthectomies and were then subjected to free-fall tests. Videotaped recordings of the fall movements were analyzed for asymmetry and adaptation. Several methods of recording and analysis were tried. Analysis was found to be enhanced by the use of an automatic 3D computer analysis.

The heterosynaptic facilitation or suppression of synaptic efficacy between parallel fibers and the dendritic spines of Purkinje cells (PCs) in the cerebellar cortex has been for decades the basic idea of sensorimotor adaptation. Great efforts in order to get direct evidence failed, or were not accepted as direct proofs. A new facility was introduced with the structural analysis of intradendritic records of the PC. These records reveal a generally double (rarely single, triple or quadruple) rhythmic pattern of small spikes, which are proposed to be prespikes of dendritic origin. Moreover, they may take their origin at functionally separated dendritic compartments resulting in a nonlinear, phase-sensitive integrative process, performed by the compound spike generating mechanism of the cerebellar PC.