【作者】 范霞；

【导师】 罗星凯；

【作者基本信息】 广西师范大学 ， 课程与教学论， 2008， 硕士

【摘要】 猜想与假设是科学探究活动的核心环节之一,它的深度和广度,也就是猜想与假设的质量决定了探究活动的质量和深入程度。而决定猜想质量的主要是探究问题内容本身,另外还有探究问题的呈现方式,以及探究者的兴趣、认知风格等因素。但是在一线探究式教学实践中探究问题呈现方式和中学生思维活动的关系的确让很多人困惑。本文从这一切入点着手,进行了三种具体常见呈现方式与中学生提出科学猜想思维活动关系的初步研究。猜想和假设是科学探究活动的核心,具有预见性,在一定程度上决定着探究的方向,起着承上启下的作用,同时也是学生思维活动最为活跃和最为发散的阶段。因此研究中学生猜想与假设的思维活动,对促进探究式教学的开展以及教学改革都有着重要的意义。一般来说,中学生提出猜想与假设都是根据已有的经验和知识进行的。为了更深入地研究猜想与假设的思维活动的真实情况,本文以物理学科为背景,通过精心设计的调查问卷以及三个真实问题情景,采用问卷调查和访谈相结合的方式,选取阳溯中学高一年级126名学生进行测试,同时还进行了CSA认知风格测试,获得了比较全面、详细而真实的第一手数据。然后对调查问卷、访谈信息和CSA认知风格测试结果进行比较分析,在样本范围之内得出以下结论:1.有着共同非常熟悉生活经验的探究问题,图文、视频和实物三种呈现方式被试提出猜想的数量和质量没有显著性区别,这与有丰富教学经验的教师和专家根据经验判断的结果相一致。2.科学含量不高的探究问题,图文、视频和实物的呈现方式下,提出猜想与假设的数量视频和图文两种方式存在显著性差异,而实物与其他两种方式的差异没有达到显著性水平;三种呈现方式下的猜想质量都不高,实物呈现方式稍好于其他方式。3.现象与学生经验相左,且需要一定的知识水平才能解决的问题,图文、视频和实物三种呈现方式下,提出猜想与假设的数量存在显著差异,其中图文与其他两种呈现方式存在显著性差异,视频和实物呈现方式未达到显著性差异水平;而猜想质量实物呈现方式最好。真实的探究实验器材让学生感到亲切,也更容易引起学生的探究兴趣,而使学生能较快地进入探究状态。4.总体来看,实物呈现方式人均提出的猜想数量最多,图文次之,视频第三。猜想与假设是探究者在感知到外部实验现象的信息和结合自己内部已有的知识、经验基础之上对探究问题提出的猜测估计或者假定性解释。实物与其他呈现方式相比,可以多角度多层次地给探究者提供更多立体时空的刺激信息,引起知觉注意,因此提出了比其他两种呈现方式更多的猜想与假设。5.人均使用的思维策略频数,图文呈现方式明显少于其他两种呈现方式,而实物呈现方式好于视频呈现方式。6.实物的呈现方式,被试使用的思维策略集中在观察和类比两种思维策略,图文方式主要使用类比思维策略,视频方式使用的思维策略除了观察和类比之外还用了演绎和溯因等思维策略,种类较多,利于培养学生的发散思维和创新思维。7.学生提出猜想数量的多少与题目呈现的先后有关,先呈现的问题学生提出的猜想数量多,后呈现的问题学生提出的猜想数量少。8.整体型和表象型认知风格的被试适合图文呈现方式下提出高质量的猜想与假设;分析型风格的被试,适合用视频呈现方式呈现探究问题,提出高质量的猜想与假设;言语型风格的被试最不适合在实物呈现提出高质量的猜想与假设;实物呈现方式下,绝大多数认知风格的被试都能提出高质量的猜想与假设。从总体上来看,在猜想与假设环节,实物呈现方式无论是在数量、思维策略使用次数和猜想质量方面都优于是其他呈现方式。结合已有的研究表明:要想学生提出丰富的猜想并进一步地探究下去,实物的重要性和不可替代性不言自明。更多还原

【Abstract】 Conjecture and hypothesis is one of the step of scientific inquiry activities. The quality of conjecture and hypothesis that is its depth and breadth, decides to the inquiry’s quality and depth.While the quality of conjecture is mainly decided by the content of inquiry,the problem-presenting mode, as well as the interests of explorer .In the inquiry teaching practice, many instructors are confused about the essential relations between the problem-presenting mode and scientific conjecture thinking activities of secondary school students. This paper is about the primary study on the relation-ship of three typical types of problem-presenting modes and scientific conjecture thinking Activity of secondary school students.Conjecture and hypothesis which is the core of scientific exploration activities, determines the direction of inquiry to certain extent, and plays a connecting role . It is the most active and divergent stage in students’thinking activity. Therefore, research on scientific conjecture thinking Activity of secondary school students is significant to promote inquiry teaching and teaching reform.Generally, students conduct their conjecture and hypothesis according to the knowledge they have already known( ideas they have). In order to show the true situation of conjecture and hypothesis thinking activity of middle school students when they are doing scientific activities, this study takes the physics subject as the background, the 126 students of grade 1, senior middle school as research subjects. We use a well-knitted questionnaire and clinic interviews which is combined with three true problem situations to examine the students selected from the middle schools in Yangshuo County of Guangxi Province, the study has a comprehensive and detailed first-hand data. The results of thorough analysis and research on the information from the above mentioned interview and investigation show as the following.1. To the inquiry problems which is common and very familiar life experience to students, there is no significant difference of the quantity and quality of conjecture under the test of three presenting modes——the picture and text, video and real material . This result is consistent with the conclusion drawn by experienced teachers and experts according to experience.2. To the inquiry problem embodying less Scientific knowledge, there is no significant difference in quantity of conjecture,and the quality of conjecture is low .The presenting mode of real material is better than the other two types.3. when Phenomenon and students’experience conflict with each other , and the solving of exploration problem need certain knowledge level. There exist notable difference in the quantity of conjecture under three presenting modes—the picture and text, video and real material; Real material presentation modes is best. Real experiment equipment is not only approachable to student, but also easier to arouse a student exploration interest, makes students enter exploration state quicker.4. Overall, the conjecture quantity on average is maximum under real material presenting mode, picture and text mode take second place, video mode third. Conjecture and hypothesis are guesstimate or assumed explaination to exploration problem , which are made on inquirer’s integration between perception to outside experiment phenomenon information and inner knowledge , experience basis. Comparing with two other mode ,Real material presentation mode can provide three-dimensional space-time information to stimulate inquirer under multiple points of view and echelons, so the inquirer can make more conjecture and hypothesis than two other modes.5. The average frequency of thinking strategy under the presenting mode of the picture and text ,is obviously less than the other two types,while the presenting mode of real material is better than the video presenting mode .6.Students’thinking strategy concentrate on observation and analogy under the presenting mode of real material .Students manily use analogy thinking strategy under the presenting mode of the picture and text .In spite of observation and analogy ,students also use deduce and tracing back thinking strategy under the video presenting mode, which is helpful to foster the student’s volatilizable and innovative thought.7. The quantity of students’conjecture is related to sequence of problem presentation. To the problem appearing earier, quantity of students’conjecture is larger than those appearing later.8.The students of wholist cognitive style and imagery cognitive style are fit for bringing forward high conjecture quantity under the presenting mode of picture and text ; The students of analytic cognitive style are fit for bringing forward high conjecture quantity under video-presenting mode; The students of the verbal cognitive style are not fit for bringing forward high conjecture quantity under the presenting mode of real material .Generally , most cognitive style can bring forward high conjecture quatity under the presenting mode of real material .Overall, on conjecture and hypothesis stage, under the presenting mode of real material , the conjecture quality and quantity as well as thinking stragtegy are better than the other two modes .Combining with some other finished research, we can conclude : In promoting students to make rich conjecture and to probe into further, it is obvious that real material object is significant and irreplaceable.更多还原