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The neurons generating resting discharge in postganglionic neurons are constantly apprised by activity of aortic baroreceptors. We evaluated influence of denervation of baroreceptors on appearance and size of parameters of shared input accompanied with reciprocal activation observed in activity of sympathetic renal fibers of anaesthetized rabbits. The number of examined interaction was significantly reduced an hour after baroreceptor deafferentation in comparison with control conditions (χ2=5.738; P=0.017). However the evaluation of value of parameters of cross-correlation (width of shared input, height of shared input, mean amplitude and width of reciprocal activation and the distance between peaks) carried out during intact baroreceptor innervation and one hour after severing aortic nerves did not show any significant differences.
In perceptual-motor tasks, the influence of flankers can be modified. Their influence can increase when they are more often congruent with the target and decrease when they are more often incongruent. The black horizontal string of shapes was presented on a white background. The string contained: two flanker arrows in the middle, the target arrow on the left (or right) and a square on the right (or left). In one half of trials the target was more often congruent (arrow pointing in the same direction as flankers) when it was presented on the left, in the second it was more often congruent when it appeared on the right. Our results showed that the reaction time for incongruent trials was shorter when the target was presented on the side with predominance of incongruent targets than for incongruent trials with target presentation on the side with predominance of congruent targets. Reactions were faster for congruent than for incongruent trials in both cases of predominance. Related results were observed in the modulation of N2PC amplitude. The influence of flankers can be modified by changing the proportion of congruent targets in the selected location.
This study was carried out on sympathetic renal fibers of anaesthetised rabbits. Shared input assessed by cross-correlation analysis was found in 159 pairs of neurons in control conditions and in 128 during increased blood pressure. The width of cross-correlogram peak was 237.57±5.54 ms in control conditions and 249.97±7.13 ms during elevated blood pressure. The peak height was respectively 4.03±0.14 spikes/s and 4.39±0.23 spikes/s. Geometric mean of frequency of discharge of neuronal pairs was 1.17±0.04 spikes/s and 0.93±0.04 spikes/s. Geometric mean of cardiac modulation was weak 33.56±1.18% and significantly correlated with geometric mean of frequency of discharge and correlogram width in control conditions. The respiratory modulation of pairs of neurons was strong – respectively 78.63±0.85% and 88.29±0.95% – and was significantly related with geometric mean of frequency of discharge, correlogram width and peak height in resting conditions.
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