Estrogen abolishes latent inhibition in ovariectomized female rats

Estrogen is frequently prescribed as a method of birth control and as hormone replacement therapy for post-menopausal women with varied effects on cognition. Here the effects of estrogen on attention were examined using the latent inhibition (LI) behavioral paradigm. Ovariectomized (OVX) female rats were given either estrogen benzoate (EB, 10 or 100 microg/ml/kg; SC) or sesame oil vehicle. Males and OVX females receiving vehicle displayed normal LI. In contrast, LI was abolished in OVX females receiving EB. The lack of LI in OVX females receiving EB was a result of low suppression ratios, reflecting strong conditioning between the tone and the shock in these subjects even if they were pre-exposed to the tone. Thus, estrogen impaired the ability of OVX females to ignore irrelevant stimuli. Since different cognitive tasks vary in their required ability to ignore irrelevant stimuli, these results may account for some of the variations in the current literature on estrogen and cognition.     

The impact of landmark properties in shaping exploration and navigation

This study was aimed at uncovering physical and geometric properties that make a particular landmark a target of exploration and navigation. Rats were tested in a square open-field arena with additional portable corners featuring the same properties as the arena corners. It was found that the routes of progression converged upon the added corners, whether located at the arena wall or the arena center. Route convergence upon the added corners involved numerous visits to these corners. However, time spent at the added corners was relatively short compared with the arena corners, including that from which rats were introduced into the arena. There was no differential effect of testing rats in light or dark, or with a low versus a high portable corner. It is suggested that the added corners were distinct against the background of the arena enclosure, whereas the four arena corners and walls were encoded by the rats as one geometric module. This distinctness, together with the greater accessibility of the added corners, made them salient landmarks and a target of exploration. Thus, the impact of a landmark extended beyond its specific self-geometry to include accessibility and distinctness, which are contextual properties. In addition to the contextual impact on locomotor behavior there was also a temporal effect, with security initially dominating the rats’ behavior but then declining along with an increased attraction to salient landmarks. These spatiotemporal patterns characterized behavior in both lit and dark arenas, indicating that distal cues were secondary to local proximal cues in shaping routes.     

City rats: insight from rat spatial behavior into human cognition in urban environments

The structure and shape of the urban environment influence our ability to find our way about in the city. Understanding how the physical properties of the environment affect spatial behavior and cognition is therefore a necessity. However, there are inherent difficulties in empirically studying complex and large-scale urban environments. These include the need to isolate the impact of specific urban features and to acquire data on the physical activity of individuals. In the present study, we attempted to overcome the above obstacles and examine the relation between urban environments and spatial cognition by testing the spatial behavior of rats. This idea originated from the resemblance in the operative brain functions and in the mechanisms and strategies employed by humans and other animals when acquiring spatial information and establishing an internal representation, as revealed in past studies. Accordingly, we tested rats in arenas that simulated a grid urban layout (e.g. Manhattan streets) and an irregular urban layout (e.g. Jerusalem streets). We found that in the grid layout, rat movement was more structured and extended over a greater area compared with their restricted movement in the irregular layout. These movement patterns recall those of humans in respective urban environments, illustrating that the structure and shape of the environment affect spatial behavior similarly in humans and rats. Overall, testing rats in environments that simulate facets of urban environments can provide new insights into human spatial cognition in urban environments.     

Identification with groups: the role of personality and context

Is identification a product of personality or of the context? We examine this question by adopting a multidimensional conceptualization of identification (the CIDS model) that integrates research perspectives on personality and contextual effects. We investigate (Study 1) the relationships of traits to identification with the nation (students, N = 77), the army (soldiers, N = 220), and a business school (students, N = 123). Then we show that the modes of identification vary in their stability across social contexts and in their susceptibility to contextual change. Idealizing groups' symbols (“deference” identification) is especially stable across different foci of identification (Study 2): the military and former high school (soldiers, N = 188), the business school and the nation (students, = 62), and the military and one's ethnic group (soldiers, N = 95). Perceiving the group as a central part of the self (“importance” identification) is the most susceptible to contextual effects of priming values (Study 3; students, N = 80, 60) and the group's status (Study 4; students, N = 68).     

Antecedents of mirror self‐recognition of toddlers: Emotional availability,birth order,and gender

The present study employed a longitudinal design for examining the role of emotional availability of child–mother dyads, birth order of children, and their gender as determinants of mirror self‐recognition of toddlers. It was hypothesized that toddlers who maintained more optimal emotional availability with mother at the age of 12 months would tend to identify themselves more readily at the age of 20 months. We assumed further that first‐born children and females would identify themselves more readily than males and younger siblings. A sample of 54 nonrisk children and their mothers was investigated. Path analysis model showed that emotional availability partly predicted self‐recognition: responsive toddlers identified themselves more often than less responsive peers. No significant effects were found for the other scales of emotional availability. A nonlinear birth order effect was observed, with second‐born children being less likely to show mirror self‐recognition than first‐borns or third‐borns. Child gender was not significantly associated with self‐recognition at the age of 20 months. The data showed further that birth order was significantly linked with components of emotional availability. No significant correlations were found between emotional availability scores and child gender. Results were discussed in light of the different components of emotional availability, and the psychological correlates of ordinal position in the family. ©2002 Michigan Association for Infant Mental Health.     

Romantic Contexts, Sexual Behavior, and Depressive Symptoms among Adolescent Males and Females

In order to examine the association between sexual behavior and depressive affect among adolescents, 122 and 219 Israeli adolescents, in two separate studies, reported their romantic and sexual history, the quality of their relationships and level of depressive symptoms. Findings show that a higher level of sexual activity in short-term romantic relationships, which were low in intimacy and authenticity, was related to increased levels of depressive symptoms among females but not among males. In contrast, involvement in stable romantic relationships was not associated with increased depressive affect for either gender. Findings from a 3 month follow-up suggested that it may be that an increased level of depressive symptoms leads adolescent females to become more sexually involved in short romantic encounters.     

The Importance of Spiritual Consumption,Religious Expression and Subjective Well-Being among Christians in the US during COVID-19

Journal of Religion and Health - Uncertainty, fear, and distress have become prevalent in the lives of U.S. residents since the beginning of the COVID-19 pandemic. The unpredictable reality of...     

Children's Adjustment in a Climate of Political Violence: Comparing Mother and Child Reports

There is a dearth of research on parent and child reports regarding a parent’s parenting and its contribution to a child’s adjustment. Therefore, the current study examined: (a) the differences between mother and child reports of aspects of maternal parenting (i.e., care and control), among both boys and girls; (b) which parenting report (i.e., mother’s or child’s) makes a stronger contribution to mother and child reports of the child’s adjustment in the context of political violence. One hundred and twenty-one mother-child dyads (children aged seven to 12 years old (M?=?10.02, SD?=?1.03)), who were exposed to prolonged political violence, participated in this study. Maternal care and control were assessed by mother and child reports on the Parental Bonding Instrument. Child’s adjustment was assessed both by mother’s report of child’s total difficulties and child’s self-report of posttraumatic stress symptoms (PTSS). Results revealed that both the mothers of girls and the girls themselves reported higher care, in comparison to mothers of boys and the boys themselves, while mothers of boys and the boys themselves reported higher control. Higher maternal control, as reported by the child, was associated with the child’s self-reported PTSS. Higher maternal control, as reported by the mother, was associated with the child’s total difficulties, as reported by the mother. However, maternal care, whether reported by mother or child, was not found to be associated with the child’s adjustment. School-aged children and their mothers were in agreement regarding maternal dimensions and their contribution to children’s adjustment.     

Spatial behavior: the impact of global and local geometry

Humans and other animals use the global geometry of the surrounding environment in order to orient and determine which direction they are facing. Accordingly, the impact of environment geometry on spatial behavior is reflected in the paths of progression in the environment. When the perception of the global geometry is limited, such as in large or dark environments, the global geometry of the environment has to be constructed gradually as the accumulated geometry of locales. In the present study, we progressively altered the form of a dark square test arena by means of local alterations to its corners and walls, in order to differentiate the impact of the global arena geometry from that of the local arena geometry sectors on spatial behavior in rats. We found that as long as the local alterations did not distort the global square geometry of the dark environment, the rats’ behavior did not significantly change. In contrast, distortion of the square shape of the arena resulted in significant changes in the spatial distribution of the rats’ activity. Accordingly, we suggest that the perceived global geometry affects spatial behavior, overriding the impact of the local geometry.     

Linguistic Markers and Emotional Intensity

The purpose of this experiment is to explore possible relationships between the intensity of emotions and the lexical modalities for expressing those emotions. In this experiment, 60 Hebrew-speaking subjects were asked to watch four short films that aroused emotion. Two of the films gave rise to different degrees of happiness, and two produced sadness. At the end of each film, subjects were asked to report on their emotions. This experiment was based on the supposition that there is a relationship between the various lexical modalities used by the subjects when writing about their emotions and the intensity of those emotions. The lexical modalities examined included intensifiers, the use of emotion words, repetitions, the use of first person singular, the use of metaphors, and the use of exclamations, among others. This experiment supported the research hypothesis, as it confirmed that significant differences existed between the lexical modalities found in texts written with lower emotional intensity (for both happiness and sadness) and those written with greater emotional intensity.