Effect of microgravity on the implementation of conditioned reflex skills of rhesus monkeys.

The success of two monkeys in performing an eye-head-hand coordination task was investigated during the Bion 11 flight. In comparison to the ground controls, it took the flight monkeys more time to reach the light stimuli located at 40 degrees to the left or right from the center of the panel in front of them. During flight days (FD) 5-6, the precision of hand movements deteriorated, and during FD 7-14, it improved, although the performance time increased.

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.

Prolonged postsynaptic changes in the sensorimotor cortex of the awake rabbit in response to stimulation of fibers of the white matter of the new cortex and the corpus callosum.

The postsynaptic changes in the focal potentials of the sensorimotor cortex of the awake rabbit was investigated in this study following tetanization of the corpus callosum and the white matter. Stimulation of these structures was carried out during testing. A prolonged (hour-long) increase in the amplitude of the responses was observed in some of the experiments following tetanization, as compared with the control prior tetanization.