Use of Vacuum Tube Amplification in Establishing Differential Motor Reactions

1. The electromyographic potentials arising from masticatory movements were picked up by electrodes chronically implanted in the brains of eight rats. The rats had been trained in a Skinner box to press a lever for food reinforcement on a 100 per cent schedule. Lever and food cup were separated by 180[ddot] in a cylindrical metal box one foot in diameter.

2. The problem was to determine whether thoroughly trained animals would show AGRs as determined by the presence of electromyographic potentials when, in the course of pressing, food was suddenly withheld. Only two of the eight animals gave an AGR during the extinction process, and in one of these the phenomenon was minimal.

3. In the discussion it is pointed out that the absence of AGRs in the animals was possibly related to the short time interval intervening between depression of the lever and securing the food-pellet reward.     

Generalizing Kant's Distinction between Perfect and Imperfect Duties to Trust in Different Situations

Based on previous research that violations of perfect duties cause stronger correspondent inferences than violations of imperfect ones, the authors performed four experiments to generalize this effect to trust. In Experiment 1, abstract violations of perfect duties resulted in less trust than violations of imperfect ones for specific trust scenarios. In Experiments 2 and 3, the authors experimented with different levels of abstractness of the duty violations and obtained similar effects. Experiment 4 was concerned with generalizing further—from duty violations in one situation to trust in a different situation. Although mostly consistent with the findings from Experiments 1–3, the data also demonstrated partial generalization for violations of both perfect and imperfect duties.     

Measuring trust in teams: Development and validation of a multifaceted measure of formative and reflective indicators of team trust

This article describes the development and validation of a multidimensional instrument designed to measure trust within teams. Trust is conceptualized as a latent variable resulting from distinct but related (formative) indicators, i.e., propensity to trust and perceived trustworthiness, which lead to (reflective) indicators, i.e., behaviours cooperation and monitoring between team members. The instrument was tested in two different samples. The first sample included 98 hospital professionals (14 teams) and provided data for the exploratory factor analysis of this instrument (Study 1). The second sample included responses from 112 teams (395 individuals) from three social-care institutions and was used to apply confirmatory factor analysis (Study 2). Data attesting to the underlying factor structure, internal homogeneity, construct validity, and consensual power of agreement within teams and discriminant power across teams of the instrument are presented. The final 21-item, four-factor version of this measure demonstrates good psychometric properties, with acceptable levels of reliability and validity. We conclude that the scales form a parsimonious, valid, and efficient instrument to assess trust in teams. Potential applications of this measure in research and practice are described and the implications of these findings for future research are discussed.     

风险社会中公众政治信任的形成机制及影响

风险社会中如何提升公众的政治信任成为焦点。以政治信任形成的终生学习理论为基础,将理性选择理论和社会文化理论相整合,探讨影响政治信任形成的因素,以及政治信任对政治合作的影响。对291名被试进行问卷调查,层次回归结果发现：政治信任在政治透明度感知、宽容度感知和政治合作之间发挥正向中介作用;在负面认知固化程度和政治合作之间发挥负向中介作用;政治氛围感知在政治信任和政治合作行为之间起调节作用。最后,对该结果形成的原因与在现实生活中的应用进行讨论,并对未来研究的发展方向进行展望。     

Developing a model for online support group use,empowering processes and psychosocial outcomes for individuals living with HIV/AIDS

This study examined the mechanism through which online support group (OSG) participation may promote patient empowerment among 340 individuals living with HIV/AIDS. Results from structural equation modelling revealed that greater use of OSGs was associated with more frequent occurrence of the empowering processes as measured by receiving useful information, receiving social support, finding positive meaning and helping others. Receiving useful information and finding positive meaning were related to higher levels of adaptive coping and lower levels of maladaptive coping, while receiving social support and helping others were related to higher levels of self-care self-efficacy, which in turn was related to higher levels of adaptive coping, and lower levels of maladaptive coping. Finally, higher levels of maladaptive coping were related to poorer quality of life, while higher levels of adaptive coping were related to better quality of life. Results suggest that OSG participation may offer some benefits for those living with HIV/AIDS.     

‘Please don’t put the whole dang thing out there!’: A discursive analysis of internet discussions around infant feeding

The promotion of breastfeeding is an important focus of intervention for professionals working to improve infant health outcomes. Literature in this area focuses largely on ‘choices’ and ‘barriers to breastfeeding’. It is our argument, however, that women's cultural context plays a key role in infant feeding ‘choices’. In this article, we explore contested representations of infant feeding and infant feeding choices in public debates conducted on a large British parenting website. To sample dominant representations of infant feeding circulating in UK culture, two threads were chosen from the debating board of a busy online parenting community (105 and 99 individual posts, respectively). Participants on the threads were largely women. A feminist informed Foucauldian discourse analysis was used to deconstruct the intersecting constructions of gender, childhood and motherhood implicit in public discussions about infant feeding choices. We identify dominant constructions of women who breastfeed or bottle feed, social representations of both forms of infant feeding, and explore the relationship between constructions of infant feeding choices and constructions of ‘good’ or ‘bad’ motherhood. This analysis functions to trouble the individualist assumptions underpinning the notion of infant feeding ‘choices’, considering the cultural context within which British mothers ‘choose’ how to feed their babies.     

Using System-Wide Trust Theory to Make Predictions About Dependence on Four Diagnostic Aids

The purpose of this experiment was to determine whether performance on a subsequent exam was affected when two lessons were as similar as possible except that one was presented in class and the other was presented online. In a hybrid course, half of the lessons were presented in the classroom as narrated Power Point presentations and half of the lessons were presented online as narrated Power Point presentations. Online student–teacher interaction took place in a chatroom. Furthermore, for each question on the midterm or final examination, the students had answered a pre-lesson and post-lesson question, integrated with the appropriate lesson, which queried the same fact statement as the exam question. Students performed better on post-lesson questions asked in class than post-lesson questions asked online. They also performed better on exam questions on classroom lessons than exam questions on online lessons. The results support the conclusion that social interaction aids learning.     

Dynamic Selective Exposure during Decision-Making

To understand dynamic changes in the likelihood that people would access and selectively expose themselves to information online, the present study examined the checking of account balances during simulated gambling. Sixteen participants played 120 hands of computer Blackjack for points, at higher or lower levels of risk (different point multipliers), and after each win or loss the computer recorded if participants checked their account balances. There were individual differences in checking rates. Participants who were more likely to check balances exhibited a selectivity of exposure to decision consonant information after a win at low risk. Although it was expected that people would seek to maintain positive mood, data were better explained in terms of Cognitive Dissonance. The effects of Cognitive Dissonance are liable to extend beyond single static decisions into dynamic online environments.     

Virtually Jewish

SUMMARY

The authors created a Web-based tutorial for novice-to-intermediate users of the World Wide Web using primarily Jewish content in order to encourage potential Jewish users of the World Wide Web. The lessons contain information on Jewish-themed Web sites and progressively complex information about how to use the Web. Tips and practice exercises are included.     

The shared online whiteboard: An assistance tool to synchronous collaborative design

IntroductionThe work presented in this paper comes from an industrial need for the development of new support tools for remote collaborative design. Within this framework, we present a literature review on this concept and propose the development of an online collaborative whiteboard.ObjectiveThis study aims to determine whether or not shared whiteboards can be used for remote design task collaboration, in conjunction with online chat interactions. It additionally seeks to discover if the organization of relationships and interactions within groups alter the structure of task completion.MethodThis tool was evaluated through the remote design task of a data structure diagram with data collected from 42 computer science students. This approach was carried out through students in triads, separated into different rooms who communicated via online chat and/or whiteboard. There were two variables in this experimental design, the presence or absence of a project leader and the sequencing of exchanges (each member asked permission to use the tool). This experiment aimed to determine whether the task requested could be performed and if similarities to a natural situation could be observed. Data was collected from actions performed on the whiteboard and chat interactions. The observations were conducted using a verbal interactions observation grid that was taken from a natural synchronous collaborative design situation. It included different dimensions such as cognitive synchronization, the proposal and evaluation of solutions and non-task oriented interactions.ResultsThe results show that the tool allows students to collaborate. A variety of behaviors can be observed in terms of whiteboard usage and chat interactions that depend on the experimental conditions. This study shows that the tool may be used in a natural situation and that group consciousness and coordination are very important factors in this type of task. It is clear that the nature of the chat interaction depends on the role of the subject within the group. We also observed a high level of non-task oriented communication, which was more than we expected.ConclusionThe shared online whiteboard designed in this study allows for the completion of a collaborative design task with different groups structures.