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81.
Blundell J Blaiss CA Lagace DC Eisch AJ Powell CM 《Neurobiology of learning and memory》2011,95(4):453-460
BackgroundThe pharmacology of traumatic memory extinction has not been fully characterized despite its potential as a therapeutic target for established, acquired anxiety disorders, including post-traumatic stress disorder (PTSD). Here we examine the role of endogenous glucocorticoids in traumatic memory extinction.MethodsMale C57BL/6J mice were injected with corticosterone (10 mg/kg, i.p.) or metyrapone (50 mg/kg, s.c.) during re-activation of a contextual fear memory, and compared to vehicle groups (N = 10–12 per group). To ensure that metyrapone was blocking corticosterone synthesis, we measured corticosterone levels following re-activation of a fear memory in metyrapone- and vehicle-treated animals.ResultsCorticosterone administration following extinction trials caused a long-lasting inhibition of the original fear memory trace. In contrast, blockade of corticosteroid synthesis with metyrapone prior to extinction trials enhanced retrieval and prevented extinction of context-dependent fear responses in mice. Further behavioral analysis suggested that the metyrapone enhancement of retrieval and prevention of extinction were not due to non-specific alterations in locomotor or anxiety-like behavior. In addition, the inhibition of extinction by metyrapone was rescued by exogenous administration of corticosterone following extinction trials. Finally, we confirmed that the rise in corticosterone during re-activation of a contextual fear memory was blocked by metyrapone.ConclusionsWe demonstrate that extinction of a classical contextual fear memory is dependent on endogenous glucocorticoid synthesis during re-activation of a fear memory. Our data suggest that decreased glucocorticoids during fear memory re-activation may contribute to the inability to extinguish a fear memory, thus contributing to one of the core symptoms of PTSD. 相似文献
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83.
McDaniel MA Psotka J Legree PJ Yost AP Weekley JA 《The Journal of applied psychology》2011,96(2):327-336
This paper evaluates 2 adjustments to common scoring approaches for situational judgment tests (SJTs). These adjustments can result in substantial improvements to item validity, reductions in mean racial differences, and resistance to coaching designed to improve scores. The first adjustment, applicable to SJTs that use Likert scales, controls for elevation and scatter (Cronbach & Gleser, 1953). This adjustment improves item validity. Also, because there is a White-Black mean difference in the preference for extreme responses on Likert scales (Bachman & O'Malley, 1984), these adjustments substantially reduce White-Black mean score differences. Furthermore, this adjustment often eliminates the score elevation associated with the coaching strategy of avoiding extreme responses (Cullen, Sackett, & Lievens, 2006). Item validity is shown to have a U-shaped relationship with item means. This holds both for SJTs with Likert score response formats and for SJTs where respondents identify the best and worst response option. Given the U-shaped relationship, the second adjustment is to drop items with midrange item means. This permits the SJT to be shortened, sometimes dramatically, without necessarily harming validity. 相似文献
84.
Deborah L. Whetzel Michael A. McDaniel Amy Powell Yost Nicole Kim 《International Journal of Selection & Assessment》2010,18(3):310-320
This paper reviews theory and past research concerning nonlinear relationships between personality tests and job performance. We compare linear and nonlinear regression models for each of the 32 Occupational Personality Questionnaire (OPQ32i) scales using job performance as the criterion variable. We evaluate linear, quadratic, and cubic relationships between personality and job performance by calculating changes in R (ΔR) between the linear and nonlinear models. We use 3 decision rules of varying levels for ΔR and divide a large sample randomly into 2 samples to cross‐validate any nonlinear effects found. Few scales exhibited nonlinearity and the magnitude of the departures from linearity were small. 相似文献
85.
Powell T 《The Journal of clinical ethics》2010,21(4):288-293
The ethical implications of disaster planning garner increasing scrutiny. The role of families in disaster efforts is a topic that requires additional ethical examination. This article reviews the potential roles for families before and during disasters, with particular attention to the impact on children and vulnerable elderly patients. The potential positive and negative impact of family participation in different aspects of healthcare and disaster efforts is assessed. 相似文献
86.
Research on small groups has a long history within social psychology. Unfortunately, interest in studying social processes within small groups has diminished over time despite predictions of its resurgence. Moreland, Hogg, and Hains (1994 ) computed an index of interest in small groups in the major social psychology journals between 1975 and 1993, finding an increase in the mid 1980s and early 1990s. This increase was due largely to the influence of European and social cognition approaches, which do not focus on intragroup processes. We replicated their procedures through 2006 and found that these trends have persisted. Over half of the group‐related research published from 1975 to 2006 involved intergroup relations (e.g., social identity, stereotyping), whereas other topic areas (i.e., group composition, structure, performance, conflict, and ecology) that involve intragroup processes were largely ignored. The implications of these trends for the fields of small groups and social psychology are discussed. 相似文献
87.
Objective: The aim of this study was to explore whether older people with depression and/or anxiety were potentially willing to engage with computerised cognitive‐behaviour therapy (cCBT). Method: A short questionnaire was sent to 60 service users aged 65+ who were identified as having anxiety and/or depression. Results: There was a 63.3% response rate for the questionnaire. Almost half of the respondents said they would be interested in using cCBT, and would be willing to learn the necessary computer skills. Conclusions: This pilot study suggests that older people with anxiety and/or depression may be willing to engage with cCBT. However, a number of important factors are highlighted that would need to be considered in deciding whether to develop access to cCBT for older people. 相似文献
88.
Forgiveness research has focused almost exclusively on interpersonal transgressions committed in close relationships. Consequently, less is known about factors informing forgiveness of non-intimate actors. The current study addresses these gaps by investigating correlates of forgiveness over racial discrimination among African American men (N?=?171). Specifically, we explore relationships between the endorsement of traditional masculine ideology (e.g., restrictive emotionality), overall forgiveness, forgiveness with positive affect, and forgiveness with the absence of negative affect. Links between personality, religiosity, social support, discrimination experiences, and these forms of forgiveness also are examined. Restrictive emotionality emerged as a barrier to forgiveness of discrimination. However, the relationship between restrictive emotionality and forgiveness was moderated by age, socioeconomic status, personality, and religious coping disposition. 相似文献
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90.
Previous work in our laboratory demonstrated that galantamine, a cholinesterase inhibitor and weak cholinergic agonist, facilitated classical trace eyeblink conditioning in healthy, young rabbits [Simon, B. B., Knuckley, B., & Powell, D. A. (2004). Galantamine facilitates acquisition of a trace-conditioned eyeblink response in healthy, young rabbits. Learning & Memory, 11(1), 116-122.]. The current study investigated the effects of galantamine (0.0 or 3.0mg/kg) in rabbits sustaining knife-cut lesions to the fimbria-fornix, a major projection pathway connecting the hippocampus to cortical and subcortical brain structures involved in the formation of long-term memories. Two experiments were conducted. Experiment one assessed the effects of knife-cut lesions to the fornix or sham surgeries on trace eyeblink (EB) conditioning. Results indicate that fornix lesions significantly retarded EB conditioning when trace parameters were employed. Experiment 2 assessed whether treatment with galantamine would reverse the deficits caused by fornix damage. Results indicate that 3.0mg/kg GAL reversed trace EB conditioning deficits in animals with fornix knife-cut lesions. These findings suggest that galantamine may provide benefit in the reversal of cognitive dysfunction following certain types of brain damage, especially damage involving hippocampal structures. 相似文献