Relationship between maternal aggression and maternal care in the rat

Aggression among female rats is almost entirely confined to the period of late pregnancy and lactation. Behaviorally it is similar to the aggression of males including piloerection and lateral attacks, but it differs in its function. Unlike male aggression which serves to establish a social hierarchy and a territory, i. e., is competitive, maternal aggression is protective, i. e., it serves to prevent predation of the mother's offspring. In this respect it is closely related temporally and causally to maternal care; if the offspring are removed maternal aggression wanes almost immediately–its function no longer exists! Studies on aggression by mothers, among rats, from the author's laboratory are reviewed and comparisons made with maternal care. As noted, maternal aggression and maternal care are closely related during the cycle of maternal behavior and they share a similar hormonal basis and possibly the effect of uterine stimulation, but maternal care requires prolactin and the decline of progesterone while maternal aggression appears independent of pituitary hormones and does not require a decline in progesterone. Maternal aggression like maternal care appears to be organized into a hormonal phase, during pregnancy, parturition, and for about a week postpartum and a nonhormonal phase thereafter. Bilateral radiofrequency lesions of the lateral midbrain peripeduncular nucleus (PPN) produce deficits in maternal aggression if made on lactation day 7 (L7), but not earlier, without producing significant deficits in maternal behavior. Experiments showed that the PPN does not mediate hormonally stimulated maternal aggression; it appears to mediate only nonhormonally stimulated maternal aggression. Studies on the role of pregnancy hormones on long-term retention of maternal aggression and the role of olfaction in maternal aggression are also reviewed. © 1994 Wiley-Liss, Inc.     

Anxiety,hormonal responses,and coping during a judo competition

Competitive situations induced hormonal changes, depending on the outcome, victory or defeat. This study aimed to investigate the salivary testosterone (T) and cortisol (C) and the mental state responses to a real judo championship. Data about individuals’ anxiety levels, strategies of coping, and patterns of behavior were thus collected. The relationship between hormonal changes and psychological variables were also analyzed. Our results showed a C response to competition, which was especially characterized by an anticipatory rise. Depending on outcome, results did not show statistically significant different C responses. The T values noted after the last fight were significantly greater in the losers than those obtained in the winners. Hormonal response did not show a relationship with psychological variables depending on the outcome. Losers showed just before the first fight an elevated cognitive anxiety, accompanied by low self‐confidence. Moreover, they were characterized by type B behavior. Types of coping strategies also differentiated losers from winners. Finally, even if no relationships between hormonal and psychological variables depending on the outcome were found, our results showed that state and trait psychological variables, as well as the coping strategies, must be taken into account to better understand the response to competitive situations. Aggr. Behav. 27:55–63, 2001. © 2001 Wiley‐Liss, Inc.     

值得运动心理学家探索的6个问题

长期以来,运动心理学在竞技运动领域面对的6个问题包括：1）哪些心理学指标可以标志和预测训练型和比赛型运动员？2）如何界定、监测和控制长时期大运动量训练和比赛中的心理疲劳？3）达到最佳竞技状态的必要心理条件是什么？4）运动员最佳竞技状态时大脑的工作情况有哪些特征？ 5）运动员精英与其他领域精英的自我发展有何异同？6）有运动智力吗？从理论和实践两个方面对这6个问题进行了分析,提出了解决这些问题的思路。同时指出,对这些问题的探索将有助于运动心理学为母科学心理学的发展做出贡献。     

竞争情境、认知风格对学生运算性程序知识学习迁移的影响

研究竞争情境对不同性别、认知风格学生运算性程序知识学习迁移的影响。结果发现：1对于不同类型的迁移题,竞争对不同认知风格学生的学习迁移有不同的影响。其表现为：对于同型题,场独立倾向学生在竞争情境下的迁移成绩要显著高于非竞争情境,场依存倾向学生在竞争情境下的学习成绩明显低于非竞争情境。对于近迁移和远迁移题,场独立和场依存倾向学生迁移成绩差异不显著;2对于不同类型的迁移题,竞争对不同性别学生的学习迁移具有不同影响。其表现为：对于远迁移题,在非竞争情境下,男生和女生的迁移成绩差异不显著;在竞争情境下,男生和女生的迁移成绩差异显著,男生的成绩要明显优于女生;对于同型题和近迁移题,男生和女生的迁移成绩差异不显著。     

Effects of prosodically modulated sub-phonetic variation on lexical competition

Eye movements were monitored as participants followed spoken instructions to manipulate one of four objects pictured on a computer screen. Target words occurred in utterance-medial (e.g., Put the cap next to the square) or utterance-final position (e.g., Now click on the cap). Displays consisted of the target picture (e.g., a cap), a monosyllabic competitor picture (e.g., a cat), a polysyllabic competitor picture (e.g., a captain) and a distractor (e.g., a beaker). The relative proportion of fixations to the two types of competitor pictures changed as a function of the position of the target word in the utterance, demonstrating that lexical competition is modulated by prosodically conditioned phonetic variation.     

The role of memory for compounds in cue competition

Revisions of common associative learning models incorporate a within-compound association mechanism in order to explain retrospective cue competition effects (e.g., [Dickinson, A., & Burke, J. (1996). Within-compound associations mediate the retrospective revaluation of causality judgements. Quarterly Journal of Experimental Psychology, 49B, pp. 60-80.]). These models predict a correlation between memory for compounds (as a measure for the strength of within-compound associations) and retrospective cue competition but not forward cue competition. This was indeed found in a study of [Melchers, K. G., Lachnit, H., & Shanks, D. (2004). Within-compound associations in retrospective revaluation and in direct learning: A challenge for comparator theory. Quarterly Journal of Experimental Psychology, 57B, pp. 25-54.]. We argue that a higher-order reasoning account of causal learning can also explain the evidence for the role of within-compound associations in cue competition. Moreover, this account predicts that if making inferences during the learning stage is impeded, a correlation between memory for compounds and forward cue competition should be found as well. The results of a new study confirmed this prediction.     

Aggression,self-confidence,and cardiovascular reactions in competitive performance in adolescent boys

Interactions between suggested risk factors for the development of coronary heart disease (namely aggression, competitive performance, and cardiovascular reactions) were studied in 36 adolescent boys. Different manifestations of aggression were measured using a structured interview, the aggression-impatience factor of the MYTH test, and observation. Self-confidence was assessed by means of an interview. The performance tests used were the Stroop Color Word test and the P-factor test. Cardiovascular reactions were measured using an automatic noninvasive sphygmomanometer with a continuous recording system. Results showed that the significance of aggression in performance or competition cannot be evaluated separately; aggression in itself had an injurious effect on performance, but when combined with high self-confidence it resulted in a high level of performance. High cardiovascular reactivity was related to competitiveness rather than aggression. The results emphasize that before intervention programs for behavioral risk factors of coronary heart disease are planned, there are many questions to answer.     

Proactive inhibitory control: A general biasing account

Flexible behavior requires a control system that can inhibit actions in response to changes in the environment. Recent studies suggest that people proactively adjust response parameters in anticipation of a stop signal. In three experiments, we tested the hypothesis that proactive inhibitory control involves adjusting both attentional and response settings, and we explored the relationship with other forms of proactive and anticipatory control. Subjects responded to the color of a stimulus. On some trials, an extra signal occurred. The response to this signal depended on the task context subjects were in: in the ‘ignore’ context, they ignored it; in the ‘stop’ context, they had to withhold their response; and in the ‘double-response’ context, they had to execute a secondary response. An analysis of event-related brain potentials for no-signal trials in the stop context revealed that proactive inhibitory control works by biasing the settings of lower-level systems that are involved in stimulus detection, action selection, and action execution. Furthermore, subjects made similar adjustments in the double-response and stop-signal contexts, indicating an overlap between various forms of proactive action control. The results of Experiment 1 also suggest an overlap between proactive inhibitory control and preparatory control in task-switching studies: both require reconfiguration of task-set parameters to bias or alter subordinate processes. We conclude that much of the top-down control in response inhibition tasks takes place before the inhibition signal is presented.     

Causal competition based on generic priors

Although we live in a complex and multi-causal world, learners often lack sufficient data and/or cognitive resources to acquire a fully veridical causal model. The general goal of making precise predictions with energy-efficient representations suggests a generic prior favoring causal models that include a relatively small number of strong causes. Such “sparse and strong” priors make it possible to quickly identify the most potent individual causes, relegating weaker causes to secondary status or eliminating them from consideration altogether. Sparse-and-strong priors predict that competition will be observed between candidate causes of the same polarity (i.e., generative or else preventive) even if they occur independently. For instance, the strength of a moderately strong cause should be underestimated when an uncorrelated strong cause also occurs in the general learning environment, relative to when a weaker cause also occurs. We report three experiments investigating whether independently-occurring causes (either generative or preventive) compete when people make judgments of causal strength. Cue competition was indeed observed for both generative and preventive causes. The data were used to assess alternative computational models of human learning in complex multi-causal situations.     

The influence of facial masculinity and voice pitch on jealousy and perceptions of intrasexual rivalry

The assessment of same-sex individuals as intrasexual competitors may depend in part on the perceived mate value of potential rivals. Men’s and women’s preferences for vocal and facial masculinity suggest that feminine women and masculine men may be perceived as more threatening intrasexual competitors. We tested the influence of men’s and women’s vocal and facial masculinity on preferences for who should accompany romantic partners on a weekend trip and on jealousy in response to imagined flirting. We found that men and women preferred their partners to be accompanied by people who had less masculine/feminine voices, and were more jealous in response to people who had relatively more masculine/feminine voices. Women, but not men, rated faces with exaggerated sex-typical characteristics as undesirable travel companions for their romantic partners and reported more jealousy in response to imagined flirting from such faces. We also found that participants who rated masculine male and feminine female stimuli as more attractive also perceived such stimuli as greater intrasexual threats, demonstrating individual differences in competition-related social perceptions. Our findings indicate that perceptions related to intrasexual competition are related to cues to underlying mate quality, which may aid in effective mate guarding.