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91.
The current study was conducted to determine the potential relationship between stress-induced corticosterone secretion and corticosteroid receptor mRNA levels after 5 days of intermittent stress. In particular, we were interested in the rate at which animals terminate a stress response, and how this termination may be altered by repeated stress. Adult male Sprague-Dawley rats were subjected to either 5 days of restraint stress or 5 days of an unpredictable stress paradigm. Restraint-stress induced corticosterone secretion was measured on Days 1 and 5 in both groups, and animals were killed on Day 6. Glucocorticoid receptor (GR), and mineralocorticoid (MR) mRNA levels were determined using in-situ hybridization techniques. Five days of restraint stress caused an habituation of the plasma corticosterone response to stress measured 60 and 90 min post-stress initiation; this pattern of corticosterone secretion was not observed in the animals subjected to unpredictable stress. Five days of either stress paradigm did not alter MR mRNA levels measured within the hippocampus or GR mRNA levels within the hippocampus or the medial parvocellular division of the paraventricular nucleus of the hypothalamus (mpPVN). However, an individual's GR mRNA levels measured within the CA1/2 region of the hippocampus and the mpPVN were significantly correlated with the degree of habituation of the corticosterone response to stress measured on Day 5. This suggests that an increase in the rate of termination of the stress response and levels of GR within the hippocampus and mpPVN may be functionally related. 相似文献
92.
Bernd Simon Pawel Mlicki Lucy Johnston Antonio Caetano Miroslaw Warowicki Ad Van Knippenberg Richard Deridder 《European journal of social psychology》1990,20(6):519-523
An experiment (n = 61) investigated the effects of ingroup and outgroup homogeneity on ingroup favouritism, stereotyping and the overestimation of relative ingroup size. As predicted, outgroup homogeneity was conducive to ingroup favouritism. Ingroup homogeneity, however, failed to influence ingroup favouritism. Also unexpectedly, asymmetry in group homogeneity — irrespective of whether the ingroup or the outgroup was the more homogeneous group — led to pronounced stereotyping of both groups and to the overestimation of relative ingroup size. 相似文献
93.
This study of naturally occurring behaviour employed a "beeper technique" to investigate the actions carried out by 152 subjects in eight different groups, viz. adult students, employed students who were also parents, unemployed, art students, doctoral students, alcoholics, retired people and a control group. Actions were sampled for seven subsequent days, five times per day between 8 a.m. and 10 p.m. at randomly selected occasions. Each action was rated on a number of variables, shortly after it was sampled (median delay approximately 10 min). Some of the findings were: Time allocation corresponded well with national estimates. Being under situational control was highly aversive. Instrumental and consummatory orientations correlated positively. The background variables were, on the whole, only rather weakly related to action ratings, but it was found that women and retired persons tended to report a higher level of well-being. 相似文献
94.
Dr. Charlotte Johnston William E. Pelham Jr. 《Journal of abnormal child psychology》1990,18(4):407-417
Relationships among maternal characteristics, ratings of child behavior, and observed mother-child interactions were examined in a sample of 40 4- to 12-year-old children with externalizing disorders. Mothers and children were observed in a task interaction and mothers provided self-reports of depressed mood, parenting self-esteem, marital satisfaction, social support, and life stress. Child behavior was rated by both mothers and teachers. Several significant correlations were found among observed mother and child behaviors and among maternal self-report measures. However, few significant relationships were found between maternal characteristics and observed mother or child behavior. Although life stress predicted increased child negativity, maternal depressed mood was related to more appropriate child behavior. Mother and teacher ratings of child behavior demonstrated few significant relationships with other measures. These results suggest that, in samples comprised primarily of children with attention deficit disorder from socially advantaged families, few relationships exist between maternal characteristics, parenting behavior, and child behavior.This study was part of a doctoral dissertation conducted by the first author at Florida State University, under the direction of the second author, and supported by the Social Sciences and Humanities Research Council of Canada. Portions of the data also appear in a chapter by Johnston titled A behavioral-family systems approach to assessment: Maternal characteristics associated with externalizing behavior in children. In R. Prinz (Ed.),Behavioral assessment of children and families (Vol. 4, pp. 163–189). Greenwich, CT: JAI Press. The authors express appreciation to Alan Lang, Barbara Licht, and Richard Tate, for their thoughtful comments. We are grateful to Beverley Atkeson and a dedicated group of coders and to Dr. C. E. Cunningham and the staff of the Chedoke Child and Family Center for their support. Finally, our thanks to the families who participated. 相似文献
95.
96.
Male hamsters were tested for their responses to areas that had been scent marked by intact or vaginectomized females to determine the effects of naturally deposited vaginal secretions on male behavior. In the first experiment males produced more ultrasonic courtship calls when investigating areas marked by intact females than areas scented by vaginectomized females, demonstrating that vaginal marks facilitate such calling. In a wind-tunnel preference test situation in which scent-marked alleys and clean alleys served as sources of odor, males approached the scented alley first if it had been freshly marked by intact females but not if it had been scented by vaginectomized females or other males. Thus, the odors of vaginal marks are sufficient to attract males over short distances. After males entered these alleys they showed a preference for odors of both intact and vaginectomized females over no odors, but still spent significantly more time investigating the odors of intact females than those of vaginectomized females. These experiments indicate that vaginal secretions are one of the primary cues that elicit male courtship calling, and the small quantities of vaginal secretions deposited by females in vaginal marks are sufficient to elicit ultrasonic calling and attract males over short distances. Thus it is likely that vaginal scent marking and ultrasonic calling by females interact to facilitate attraction and location of mates during courtship. 相似文献
97.
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99.
James J Johnston 《European journal of social psychology》1976,6(3):375-380
Under the guise of an experiment on gambling decisions, subjects briefly met a confederate of the experimenter, whom they later evaluated. The major hypothesis was that the confederate would be evaluated more favorably by subjects who were told that she had received a fortuitous reward than by control subjects. The hypothesis was confirmed for female subjects only. 相似文献
100.
G C Van Orden J C Johnston B L Hale 《Journal of experimental psychology. Learning, memory, and cognition》1988,14(3):371-386
Van Orden (1987) reported that false positive errors in a categorization task are elevated for homophonic foils (e.g., HARE for A PART OF THE HUMAN BODY). Two new experiments replicate this finding and extend it to nonword homophone foils (e.g., SUTE FOR AN ARTICLE OF CLOTHING). False positive errors to nonword homophone foils substantially exceed false positive errors to nonhomophonic nonword spelling controls, showing that the phonological characteristics of the nonword foils are critical. Because nonwords are not represented in the lexicon, this new result implicates computed phonological codes as a source of the categorization errors. Additionally, in each of two experiments, matched word and nonword homophones produced virtually identical error rates. If stimulus nonword homophones are viewed as extremely unfamiliar words, compared with the relatively familiar stimulus word homophones, then our failure to observe an effect of stimulus familiarity strengthens the case that phonological coding plays a role in the identification of all printed words. The fact that the results are obtained in a categorization task that requires reading for meaning (rather than a lexical decision task) makes it difficult to avoid the conclusion that phonological mediation plays a role in normal reading of text for meaning. 相似文献