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1.
This article concerns a lacuna in chemistry students' reasoning about chemical bonding. Although chemistry students are familiar with the charges that make up the atom––both positive and negative––they refer only to the attraction between unlike charges. Specifically, they ignore the repulsion between the positive nuclei. We named this disregard of repulsion the lacuna of repulsion. Repulsion is a crucial component in the force-based explanation of chemical bonding, presenting the bond as a dynamic equilibrium between attraction and repulsion electrical forces. We noticed this lacuna incidentally while interviewing chemistry students for a bigger project aimed at supporting students in understanding the force-based explanation of chemical bonding. This article describes our systematic qualitative study of the lacuna of repulsion and its impact on mental models of 23 high school chemistry students. Our findings show that students use six mental models, most of them built upon each other. Beginning from a simple mental model that describes the chemical bond as electrons, continuing with the including attraction forces, and completing with repulsion and a dynamic view of the bond. Only when one considers both attraction and repulsion forces and understands the dynamic balance between them is it possible to build the force-based dynamic mental model of chemical bonding. 相似文献
2.
Anat Zohar Noa Schwartzer Pinchas Tamir 《International Journal of Science Education》2013,35(7):769-782
An important question which is often overlooked addresses the nature and quantity of higher‐order thinking activities when teachers are not explicitly ‘teaching for thinking’ but rather acting and behaving routinely. This study investigates the scope and nature of tasks demanding students’ application of higher‐order thinking skills while studying biology in junior and senior high schools in Israel. The method used is the collection and analysis of questions asked by teachers during classroom discourse, in homework assignments and in tests. The main findings show: (a) that the frequency of higher‐order thinking questions in biology class discourse in Israel is approximately 20%; (b) that the cognitive level of teachers’ questioning in HS is higher than in JHS; (c) that the matriculation exam has a strong influence on tests given by teachers; and (d) that while inquiry questions permeated HS testing they are less salient in HS class discourse, indicating the need for remedial treatment which should include the integration of more inquiry‐oriented pedagogies into classroom practice. 相似文献
3.
Zohar Kampf 《The Communication Review》2016,19(4):254-258
ABSTRACTTamar Liebes was a groundbreaking and fearless scholar who nurtured generations of media researchers at the Hebrew University of Jerusalem. Groundbreaking, because she paved new trajectories in the study of popular communication and applied pioneering qualitative research methods to media studies. Toward the end of the 1970s, when only few perceived that popular culture was a legitimate field of inquiry and even fewer believed that interpretative efforts in the spirit of the humanities were worth institutionalizing in the social sciences, it was Tamar who swam against the stream and completed a pioneering study on the reception of the American soap opera Dallas among members of different cultural communities. Her book The Export of Meaning: Cross-Cultural Readings of Dallas (co-authored with Elihu Katz) soon became canonic and is still being taught in introductory media studies courses around the world. Fearless, because the same road Tamar paved to establish these lines of research and, indeed, to revolutionize the field of communication, was also rife with rivalries, battles, and struggles she never hesitated to engage in. Tamar was the white knight who never feared fighting the dragons, and in some cases (though not all) she even won. 相似文献
4.
The concept of metacognition refers to one’s knowledge and control of one’s own cognitive system. However, despite being widely
used, this concept is confusing because of several reasons. First, sometimes it is not at all clear what is cognitive and
what is metacognitive. Second, researchers often use the same term, namely, “metacognition” even when they refer to very different
aspects of this complex concept. Alternatively, researchers may use different terms to indicate the same metacognitive elements.
Another foggy matter is the interrelationships among the various components of metacognition discussed in the literature.
This conceptual confusion regarding the concept of metacognition and its sub-components calls for in-depth theoretical and
conceptual clarifications. The goal of this article is to portray a detailed example of a conceptual analysis of meta-strategic
knowledge (MSK) which is one specific component of metacognition. This specific example is used to draw a general model for
conceptual analyses of additional metacognitive components. The approach suggested here is to begin with a clear definition
of the target sub component of metacognition, followed by a systematic examination of this sub component according to several
dimensions that are relevant to metacognition in general and to that sub component in particular. The examination should include
an analysis of how the details of the definition of the target sub-component refer to: (a) general theoretical metacognitive
issues raised by prominent scholars; (b) definitions formulated and issues raised by other researchers who have investigated
the same (or a similar) sub-component and, (c) empirical findings pertaining to that sub-component. Finally, it should be
noted that since metacognition is a relational rather than a definite concept it is important to situate the context within
which the conceptual analysis takes place. 相似文献
5.
We tested the effects of morphological and orthographic differences between English, Hebrew, and Arabic on the functioning of the two cerebral hemispheres. University students who were native speakers of each of the three languages performed a lateralized consonant-vowel-consonant (CVC) identification task. The stimuli were presented vertically in three conditions: left visual field (LVF), right visual field (RVF), and bilaterally (BVF). Three dependent measures were used: (1) exposure duration of the stimuli in order to achieve a 50% error rate, (2) total number of errors in each presentation condition and (3) the difference between errors on the first letter and errors on the last letter, a qualitative measure of sequential processing. Arabic readers required longer exposure durations of the syllables in order to achieve a 50% error rate than Hebrew readers, who in turn, required longer exposure durations than native English readers. Readers of all three languages evinced left hemisphere specialization for this linguistic task and a bilateral advantage. The qualitative patterns revealed that the Arabic and Hebrew speakers showed the same hemispheric difference pattern, that was different from the one shown by English readers, and that Arabic readers showed a qualitative pattern suggesting higher levels of sequential processes in both hemisphere than readers of Hebrew and English. We interpret this as reflecting the adaptation of hemispheric abilities to reading languages that differ in morphological structure and orthography. 相似文献
6.
This article reports the development and application of two instruments for assessing science teachers’ pedagogical knowledge in the context of teaching higher‐order thinking: a Likert‐type research instrument, and an instrument that analyzes classroom observations. The rationale for developing these instruments and their main categories is described. One hundred and fifty Israeli science teachers replied to the Likert‐type questionnaire. Results show that biology teachers gained a significantly higher score than either physics or chemistry teachers, that junior high school teachers scored significantly higher than high school teachers, and that a significant negative correlation was found between final scores and teaching experience. Participants in the classroom observation study were 14 teachers who attended a one‐year professional development course for teaching higher‐order thinking. The instrument was sensitive in detecting progress in teachers’ pedagogical knowledge in several categories, such as: Frequency of tasks that required higher‐order thinking; The variety of thinking strategies that teachers addressed during their lessons; Engagement of students in metacognitive thinking; and Using the “language of thinking” in class. The implications of the findings for research and practice are described. 相似文献
7.
Anat Zohar Anna Gershikov 《International Journal of Science and Mathematics Education》2008,6(4):677-693
This study investigates how the context of mathematical tasks affects the performance of young children (ages 5–11). Subjects
were 523 children from age 5 to 11. Three contexts of mathematical tasks (stereotypically boys’ contexts, stereotypically
girls’ contexts and neutral contexts) are examined in three age groups (young, medium, and old). Boys’ and girls’ mean scores
were compared for each age group in each of the three contexts. The data show that girls’ performance is affected by the context
of the task while boys’ performance is not. The comparison between boys and girls in the three different contexts showed that
in neutral contexts, the scores of boys and girls are similar. In (stereotypically) boys’ contexts, however, boys score significantly
higher than girls. In (stereotypically) girls’ contexts, a significant interaction is found between age and gender, showing
that the way girls are affected by such contexts depends on their age. The implications of these findings for gender-fair
mathematics learning are discussed. 相似文献
8.
This study examined the outcomes of a unit that integrates explicit teaching of general reasoning patterns into the teaching of a specific science content. Specifically, this article examined the teaching of argumentation skills in the context of dilemmas in human genetics. Before instruction only a minority (16.2%) of the students referred to correct, specific biological knowledge in constructing arguments in the context of dilemmas in genetics. Approximately 90% of the students were successful in formulating simple arguments. An assessment that took place following instruction supported the conclusion that integrating explicit teaching of argumentation into the teaching of dilemmas in human genetics enhances performance in both biological knowledge and argumentation. An increase was found in the frequency of students who referred to correct, specific biological knowledge in constructing arguments. Students in the experimental group scored significantly higher than students in the comparison group in a test of genetics knowledge. An increase was also found in the quality of students' argumentation. Students were able to transfer the reasoning abilities taught in the context of genetics to the context of dilemmas taken from everyday life. The effects of metacognitive thinking and of changing students' thinking dispositions by modifying what is considered valuable in the class culture are discussed. © 2002 John Wiley & Sons, Inc. J Res Sci Teach 39: 35–62, 2002 相似文献
9.
This article describes the Biology Critical Thinking (BCT) project in which carefully designed activities for developing specific critical thinking skills are incorporated into the biology curriculum. The objectives were to find out whether the BCT project contributes to the development of critical thinking skills in various biological and nonbiological topics and how it affects students' biological knowledge and classroom learning environment. The study consisted of 678 seventh graders who were assigned randomly into two groups that studied the same seventh-grade biology textbook. Only one group, the experimental, completed the BCT activities. The results indicate that the students in the experimental group improved their critical thinking skills compared to their own initial level and compared to their counterparts in the control group. Improved critical thinking skills were observed in a new biological context and nonbiological everyday topics, suggesting generalization of thinking skills across domains. The experimental students scored significantly higher than the control on a knowledge test, suggesting that “knowledge of facts” as one educational goal and “learning to think” as another, need not conflict, but rather can interact with each other. Finally, the results show that BCT involvement decreased the frequency of teacher-centered teaching and enhanced student-centered, more active learning. 相似文献
10.