Cognitive load in interactive knowledge construction

The focus of this special issue is on the cognitive load underlying processes of interactive knowledge construction in a wide range of instructional multimedia platforms. Multimedia comprehension involves the parallel processing of auditory–verbal and visual–pictorial channels within working memory. By means of integrating multimodal information, students are able to acquire new knowledge. However, the processes of knowledge construction may be dependent on the load a task imposes on the learner's cognitive system. Such cognitive load is determined by prior knowledge, motivation, and processing strategies on the part of the learner as well as on task demands. Other critical factors that should be explored are goal adoption and perspective taking, effects of interactive animation, environmental support, and possibilities of collaboration.     

Ethanol-glycerin fixation with thymol conservation: a potential alternative to formaldehyde and phenol embalming

Anatomical fixation and conservation are required to prevent specimens from undergoing autolysis and decomposition. While fixation is the primary arrest of the structures responsible for autolysis and decomposition, conservation preserves the state of fixation. Although commonly used, formaldehyde has been classified as carcinogenic to humans. For this reason, an adequate substitute was developed. Ethanol-glycerin fixation and thymol conservation are described and compared with formaldehyde and phenol in this technical report. The setup, tissue qualities, financial aspects, and health concerns of this method are discussed. Ethanol-glycerin fixation and thymol conservation provide outstanding haptic and optic tissue qualities. Typical formaldehyde and phenol effects, such as skin, airway, and eye irritation, as well as carcinogenic effects, can be circumvented by using ethanol-glycerin and thymol instead. Ethanol-glycerin fixation is more expensive than formaldehyde and requires an explosion-proof facility. However, the absence of health effects and its convincing tissue qualities balance these higher costs. Therefore, ethanol-glycerin fixation and thymol conservation provide a potential alternative and complement established fixation techniques. The use of carcinogenic formaldehyde and toxic phenol can be effectively restricted through the use of the described method.     

Working-class students,habitus, and the development of student roles: a Canadian case study

As their numbers at university grow, we need to gain a better understanding of the different ways in which working-class students negotiate their potential outsider status in what is often considered an essential middle-class institution. Based on data from a four-year longitudinal, qualitative study of working-class students at a Canadian university, I argue that their acceptance of the ends and means of both the academic and social demands of university contributes to the development of different student roles, which in turn affects their likelihood to succeed academically. Drawing on works by Bourdieu and Bernstein, I present four case studies of students who lived through university committed, alienated or in transition toward either commitment or alienation. I show that despite similar working-class backgrounds, study participants’ reaction to university was anything but predictable. Instead, prior socialization, clear and realistic career goals, and chance encounters at university played an important role in their approach to university life.     

Proceeding papers in journals versus the “regular” journal publications

In the present paper we proceed from recent results by Gonzalez-Albo and Bordons (2011) obtained from studying the role and impact of proceedings literature in LIS journals. We extend the research to all fields of the sciences and social sciences and address additional research questions concerning publication frequency and citation impact as well as their differences in individual journals and subject fields.     

Dynamics of mental model construction from text and graphics

When students read for learning, they frequently are required to integrate text and graphics information into coherent knowledge structures. The following study aimed at analyzing how students deal with texts and how they deal with graphics when they try to integrate the two sources of information. Furthermore, the study investigated differences between students from different school types and grades. Forty students from grades 5 and 8 from higher track and lower track of the German school system were asked to process and integrate texts and graphics in order to answer items from different levels of a text–picture integration taxonomy. Students’ eye movements were recorded and analyzed. Results suggest fundamentally different functions of text and graphics, which are associated with different processing strategies. Texts are more likely to be used according to a coherence-formation strategy, whereas graphics are more likely to be used on demand as visual cognitive tools according to an information-selection strategy. Students from different tracks of schooling revealed different adaptivity with regard to the requirements of combining text and graphic information.