The features of the exploratory behavior in the open field, of the learning of a conditioned-reflex food-procuring reaction, and of the shift in the level of biogenic amines of the brain was studied in Wistar rats with local injections of the specific neurotoxins 6-hydroxydopamine (6-OH-DA) and 5,7-dihydroxytryptamine (5,7-DHT). It was shown that damage to the structure of the serotoninergic or catecholaminergic systems of the frontal cortex and hippocampus caused by local injection of 6-OH-DA and 5,7-DHT into the neocortex is accompanied by multidirectional changes in the exploratory behavior and learning of the animals.
The problem of studies is the determination of hypothetical predictors for personality traits among five generalized EEG rhythms in the prefrontal cortex of youth soccer players. The goal of study was to explore the relationship between the oscillations of EEG rhythms in the prefrontal cortex and the personality traits of undergraduates of Sports University . The EEG was recorded using a wireless system with dry non-contact frontal sensor electrodes. The power spectrum was analyzed in five frequency bands (1-50 Hz). Personality traits determination was performed using Eysenck's personality questionnaire. A pair linear regression model, the Spearman's rank correlation and Kruskal - Wallis tests were used for analysis. The research revealed dominance of the extraversive peculiarity of the nervous system over introversive, which is likely due to preference for students, as groups as team interactions rather than individual behavioral strategies. Additionally, the findings of the study determined two slow EEG rhythms as predictors of personality traits among extraverts. It was found that delta rhythm is a correlate of extraversion, and theta rhythm is neuroticism with inversely proportional relationships. These EEG patterns of the prefrontal cortex are related to the features of behavior of youth soccer players of the extraversive type, which is caused by their temperament.
Experiments have demonstrated that Wistar rats resistant (R) to acoustic stimulation differed from nonresistant (NR) rats by elevated exploratory activity under the condition of moderate stress in an open field test, by heightened reactivity to sensory stimuli of varying modality (somatosensory, visual, and olfactory), and by a reduced level of exploratory behavior in a burrow chamber. The rats of the R group differ from the NR animals by a greater capacity to learn a goal-directed reaction and by a lower capacity for discrimination of emotionally distinct influences. The results of a biochemical analysis of the content of biogenic amines in particular brain structures revealed in the resistant rats an increase in the level of norepinephrine, and in the non-resistant rats, a higher level of dopamine and serotonin.
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