Utilization and dominance of spatially separated cues as a function of water deprivation     

Jerome S. Cohen  Gregory Hachey 《Learning & behavior》1977,5(1):103-109

Utilization and dominance of physically separate redundant-relevant cues were measured in albino rats under moderate (18 h/day) or high (23.5 h/day) water deprivation. Cues were located on goal doors (brightness) and the floor (texture) in a two-choice discrimination apparatus. Three experiments were carried out with the following paradigms: incidental cue, redundant-relevant cue discrimination, and optional shift discrimination. Deprivation did not affect rate of acquisition of initial discrimination or cue dominance. Cue utilization, however, was inversely related to deprivation in redundant-relevant cue and optional shift discrimination tasks. These effects were limited, however. Over-training on the redundant-relevant cue task eliminated the effect. Within the optional shift situation, only animals that initially acquired a texture cue discrimination were affected by deprivation. Other factors affecting cue utilization in these experiments were also described and discussed.  相似文献   

R&D spillovers, patents and the incentives to innovate in Japan and the United States     

Wesley M. Cohen  Akira Goto  Akiya Nagata  Richard R. Nelson  John P. Walsh   《Research Policy》2002,31(8-9)

National surveys of R&D labs across the manufacturing sectors in the US and Japan show that intraindustry R&D knowledge flows and spillovers are greater in Japan than in the US and the appropriability of rents due to innovation less. Patents in particular are observed to play a more central role in diffusing information across rivals in Japan, and appear to be a key reason for greater intraindustry R&D spillovers there, suggesting that patent policy can importantly affect information flows. Uses of patents differ between the two nations, with strategic uses of patents, particularly for negotiations, being more common in Japan.  相似文献   

Improvements in fundamental movement skill competency mediate the effect of the SCORES intervention on physical activity and cardiorespiratory fitness in children     

Kristen E. Cohen  Philip J. Morgan  Ronald C. Plotnikoff  Lisa M. Barnett 《Journal of sports sciences》2015,33(18):1908-1918

Numerous studies have identified a positive association between fundamental movement skill (FMS) competency and physical activity in children; however, the causal pathways have not been established. The aim of this study is to determine if changes in FMS competency mediated the effect of the Supporting Children’s Outcomes using Rewards, Exercise and Skills (SCORES) intervention on physical activity and cardiorespiratory fitness in children. Eight primary schools (25 classes) and 460 children (aged 8.5 ± 0.6, 54% girls) were randomised to the SCORES intervention or control group for the 12-month study. The outcomes were accelerometer-determined moderate-to-vigorous physical activity (MVPA) and cardiorespiratory fitness. The hypothesised mediators were actual FMS competency and perceived sport competence. Mediation analyses were conducted using multilevel linear analysis in MPlus. From the original sample, 138 (30.0%) and 370 (80.4%) children provided useable physical activity and cardiorespiratory fitness data at post-test assessments. There were significant treatment effects for locomotor skills and overall FMSs. Changes in MVPA were associated with changes in object-control skills, overall FMSs and perceived competence. The overall FMSs had a significant mediating effect on MVPA (AB = 2.09, CI = 0.01–4.55). Overall FMSs (AB = 1.19, CI = 0.002–2.79) and locomotor skills (AB = 0.74, CI = 0.01–1.69) had a significant mediating effect on cardiorespiratory fitness. The results of this study conclude that actual but not perceived movement skill competency mediated the effect of the SCORES intervention on physical activity and cardiorespiratory fitness.  相似文献   

The Role of Disordered-Eating Cognitions and Psychological Flexibility on Distress in Asian American and European American College Females in the United States     

Akihiko Masuda  Jane Le  Lindsey L. Cohen 《International journal for the advancement of counseling》2014,36(1):30-42

The present study investigated whether different forms of disordered-eating-related cognitions and psychological flexibility were associated with psychological distress among female Asian American and European American college students in the United States. Disordered-eating-related cognitions examined in the present study included thoughts (a) associated with the fear of gaining weight, (b) on perceived importance of having an ideal weight and shape as a means of being accepted by others, and (c) of perceived self-worth related to self-control over diet and weight levels. Data from 87 Asian American and 231 European American female college students were used for the present analyses. In both groups, all forms of disordered-eating cognitions were positively associated with psychological distress, which was in turn inversely associated with psychological flexibility. In the Asian American group, cognitions on perceived importance of having an ideal body shape and weight to be socially accepted by others and psychological flexibility were uniquely related to psychological distress when controlling for other disordered-eating cognitions (i.e., thoughts related to fear of weight gain, self-worth from feeling in control of eating), age, and Body Mass Index (BMI). In the European American group, when controlling for other study variables, only psychological flexibility uniquely related to psychological distress. Implications of the present findings for counseling practice are discussed.  相似文献   

Linked to innovation: Shaping an innovative climate through network intentionality and educators’ social network position   总被引：1，自引：0，他引：1  

Nienke M. Moolenaar  Alan J. Daly  Frank Cornelissen  Yi-Hwa Liou  Stacey Caillier  Rob Riordan  Kelly Wilson  N. Andrew Cohen 《Journal of Educational Change》2014,15(2):99-123

This study investigates whether educators’ cognitive and structural social capital is associated with perceptions of innovative climate in charter schools. We explore a new concept to assess educators’ cognitive social capital, namely network intentionality, meaning the extent to which an educator is intentional in connecting and interacting with others. We hypothesize that network intentionality (cognitive social capital) is related to the extent to which educators perceive their school’s climate to be innovative, but that this relationship is dependent on the educator’s position in their school’s social network (structural social capital). Findings suggest that the relationship between cognitive social capital and perceptions of innovative climate is partly mediated by structural social capital. In other words, those educators with high network intentionality, as evidenced by an orientation towards connecting others, also perceive the school’s climate as being more innovative, partly because this strong network intentionality is associated with more out-going relational activity. This work provides unique insights into the factors that may be associated with teacher collaboration in successful charter schools serving traditionally underserved populations, and suggests ideas for schools wishing to support teacher collaboration and innovation.  相似文献   

Toward High-Performance Communications Interfaces for Science Problem Solving   总被引：1，自引：1，他引：0  

Sharon L. Oviatt  Adrienne O. Cohen 《Journal of Science Education and Technology》2010,19(6):515-531

From a theoretical viewpoint, educational interfaces that facilitate communicative actions involving representations central to a domain can maximize students’ effort associated with constructing new schemas. In addition, interfaces that minimize working memory demands due to the interface per se, for example by mimicking existing non-digital work practice, can preserve students’ attentional focus on their learning task. In this research, we asked the question: What type of interface input capabilities provide best support for science problem solving in both low- and high-performing students? High school students’ ability to solve a diverse range of biology problems was compared over longitudinal sessions while they used: (1) hardcopy paper and pencil (2) a digital paper and pen interface (3) pen tablet interface, and (4) graphical tablet interface. Post-test evaluations revealed that time to solve problems, meta-cognitive control, solution correctness, and memory all were significantly enhanced when using the digital pen and paper interface, compared with tablet interfaces. The tangible pen and paper interface also was the only alternative that significantly facilitated skill acquisition in low-performing students. Paradoxically, all students nonetheless believed that the tablet interfaces provided best support for their performance, revealing a lack of self-awareness about how to use computational tools to best advantage. Implications are discussed for how pen interfaces can be optimized for future educational purposes, and for establishing technology fluency curricula to improve students’ awareness of the impact of digital tools on their performance.  相似文献   

Emotional Maltreatment and Adolescent Depression: Mediating Mechanisms and Demographic Considerations in a Child Welfare Sample     

Shiesha L. McNeil  Arthur R. Andrews  Joseph R. Cohen 《Child development》2020,91(5):1681-1697

Emotional maltreatment is a risk factor for adolescent depression. Yet, it remains unclear whether commissions and omissions of emotional maltreatment (a) confer vulnerability via distinct mechanisms and (b) demonstrate similar risk across adolescent subpopulations. The present, multiwave study examined whether school engagement and peer relationships explain the depressive effects of distinct emotional maltreatment subtypes in an at-risk child welfare sample (N = 657; ages 11–14, Age_Mean = 12.49). The findings indicated that commission subtypes of emotional maltreatment predicted increasing depressive symptoms via increasing peer relationship problems, especially for girls. Meanwhile, decreasing school engagement was a depressogenic risk pathway for Hispanic adolescents reporting omission subtypes of emotional maltreatment. The results emphasize the importance of distinguish between emotional maltreatment subtypes to identify specific risk pathways for adolescent depression.  相似文献   

The heaviside expansion theorem     

Louis Cohen 《Journal of The Franklin Institute》1922,194(6):765-770

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Friend or Foe? Perceptions of Qatar in the Israeli Online General and Sports Press     

Yair Galily  Moran Yarchi  Tal Samuel-Azran  Rona Cohen 《Journal of Intercultural Communication Research》2016,45(5):437-448

The current paper is looking into the way in which Qatar’s investment in sport, both directly and indirectly, is being perceived by the Israeli press. In order to accomplish the task set above, a content analysis of Qatar’s media coverage in the Israeli online press was conducted. Our analysis includes 1199 articles appearing in the mainstream online Israeli press and the findings point out to an interesting trend; there are significant differences between sport related stories, which present a political context and those who do not deal with politics which are significantly more supportive of Qatar.  相似文献   

美国医学教育中的职业化问题:从证据到责任   总被引：4，自引：0，他引：4  

Jordan J Cohen;  魏芬 《复旦教育论坛》2007,5(1):84-89

职业化是维护公众对医学职业信任的核心要素,也是医患关系的本质所在.但有证据表明,公众对医学职业的信任日渐消失,医生也在维护医学职业价值观念时面临着各种挑战.本文在医学教育背景下界定"职业化"的定义和框架,描述了职业化面临的各种挑战,也详细论述了医学院校和教学医院在维护医学职业化过程中的角色和作用.此外,还评述了现行和试行中的评价职业化的工具、方法.最后,作者还提出一些建议供医学院校和教学医院参考.  相似文献