The concepts of allostatic load and overload, i. e., a dramatic increase in the allostatic load that predisposes to disease, have been extensively described in the literature. Here, we show that rats engaging in active offensive response (AOR) behavioral strategies to chronic predator scent stress (PSS) display less anxiety behavior and lower plasma cortisol levels vs. rats engaging in passive defensive response (PDR) behavioral strategies to chronic PSS. In the same chronic PSS paradigm, AOR rats also have higher lactate and lower glutamate levels in amygdala but not in control-region hippocampus vs. PDR rats. The implications of these findings for regulation of allostatic and stress responses, and post-traumatic stress disorder (PTSD) are discussed.
Background. Recent research has suggested a unifactorial structure of spatial ability (SA). However, further studies are needed to replicate this finding in different populations. Objective. This study aims to explore the factorial structure of SA in samples of 921 Russian and 229 Chinese university students. Design. A gamified spatial abilities battery was administered to all participants. The battery consists of 10 different domains of SA, including 2D and 3D visualization, mental rotation, spatial pattern assembly, spatial relations, spatial planning, mechanical reasoning, spatial orientation, and spatial decision-making speed and flexibility. Results. The results of the factor analysis showed a somewhat different pattern for different samples. In the Russian sample, the unifactorial structure, shown previously in a large UK sample (Rimfeld et al., 2017), was replicated. A single factor explained 40% of the variance. In the Chinese sample two factors emerged: the first factor explained 26% of the variance and the second factor, including only mechanical reasoning and cross-sections tests, explained 14%. The results also showed that the Chinese sample significantly outperformed the Russian sample in five out of the 10 tests. Russian students showed better performance in only two of the tests. The effects of all group comparisons were small. The Factorial Structure of Spatial Abilities in Russian and Chinese Students 97 Conclusion. Overall, a similar amount of variance in the 10 tests was explained in the two samples, replicating results from the UK sample. Future research is needed to explain the observed differences in the structure of SA.
Background. Spatial ability (SA) has long been the focus of research in psychology, because it is associated with performance in science, technologies, engineering, and mathematics (STEM). Research has shown that males consistently outperform females in most aspects of SA, which may partially explain the observed overrepresentation of male students seeking STEM degrees.Objective. This study examines sex and field of study (degree) differences in different aspects of spatial ability and its structure.Design. We assessed SA by using an on-line gamified battery, which included 10 spatial tests capturing 10 dimensions of spatial ability, among which were mental rotation, spatial visualization, spatial scanning, spatial reasoning, perspective-taking, and mechanical reasoning. The sample consisted of 882 STEM (55% males) and Humanities (20% males) university students in Russia.Results. Males outperformed females on all assessed components of SA with a small effect size (1-11%). We also found that students from STEM fields outperformed Humanities students on all SA subtests (effect size ranged from 0.2 to 7%). These differences by study choice were not fully explained by the observed over-representation of males in the STEM group. The results of the study suggested no interaction between sex and degree. In other words, on average, males outperformed females, irrespective of whether they were STEM or humanities students; and the STEM advantage was observed for both 38 E. A. Esipenko et al.males and females. The same unifactorial structure of SA was observed in the STEM and Humanities groups. Conclusion.Our results are consistent with previous research, suggesting sex and study field differences in SA. Longitudinal research is needed to explore the causal mechanisms underscoring these differences.
The concepts of allostatic load and overload, i.e. a dramatic increase in the allostatic load that predisposes to disease, have been extensively described in the literature. Herein we present data to support the hypothesis that some allostatic states (i.e. chronic adjustments of physiology away from normal homeostasis) may represent adaptive, rather than pathologic, mechanisms to deal with chronic anxiety and stress. In a rat model, we demonstrate that chronic stress induces adaptive changes in the limbic-hypothalamic-pituitary-adrenal (LHPA) axis, and in lactate and glutamate/glutamine metabolism. Compared to rats with passive defensive (PD) responses to stress, rats with an active offensive (AO) responses had lower anxiety and plasma glucocorticoid levels, and increased lactate and decreased glutamate in the amygdala but not in the hippocampus. These data suggest that allostatic states may represent adaptive endogenous autonomic nervous system (ANS) strategies to calm the animal and restore homeostasis following chronic fear and stress.
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