时间应激对不同结构超文本信息搜索绩效的影响

实验探讨了时间应激对不同结构超文本信息搜索绩效的影响效应。采用 3× 2被试间设计 ,自变量为超文本结构 (层次、混合、网状 )和时间应激(应激组和对照组 ) ,因变量为答题速度和迷路指数。 48名大学生或研究生被试参与实验。结果发现 ,时间应激对超文本搜索绩效有重要影响。更具体地说 ,时间应激对网状结构超文本搜索绩效的影响尤为明显。因此 ,在需对用户浏览时间进行控制的情况下 ,最好不要采用网状结构的超文本设计。另外 ,超文本结构对超文本搜索绩效的影响效应再次得到证实。     

文本组织和结构化水平对中文信息搜索的影响

以高结构化中文信息为实验材料,探讨文本组织和结构化水平对信息搜索的影响。以文本组织形式为自变量,以材料的结构化水平为控制变量,以搜索时间和迷路指数为因变量。结果发现：线性文本的搜索时间显著长于低层次的超文本,但迷路程度显著低于所有类型的超文本;3种超文本无显著差异;对层次型超文本来说,4层次的搜索时问显著短于11层次。综合以前研究的结果提出,信息结构化水平虽然对层次深度的效应具有调制作用,但并不是影响超文本信息搜索的最主要因素。     

导航线路和个体认知风格对超文本搜索绩效的影响

本研究考察了导航线路和个体认知风格对主题性问题搜索绩效的影响效应。实验采用 2× 3的被试间设计 ,自变量为导航线路和个体认知风格 ,因变量为被试回答每个相关问题所需要的平均时间、搜索过程中打开的平均节点数和重复节点数。结果表明 ,导航线路的主效应达到显著的水平 ,而认知风格的主效应和两者的交互作用没有显著性。结论认为 :采用“关键点线路”导航有利于超文本信息的搜索     

先前知识和概念图类型对科学说明文学习的影响

研究通过3个实验,考察了先前知识和概念图类型在科学说明文学习中的作用,以及如何促进低先前知识学习者通过概念图学习科学说明文的效果。结果发现:(1)高先前知识学习者通过交互式概念图学习科学说明文的迁移效果好于静态概念图,且通过静态概念图和交互式概念图学习的记忆效果均较好。低先前知识学习者通过静态概念图学习的迁移效果好于交互式概念图,且通过静态概念图学习的记忆效果好于连接交互式概念图;(2)相比于只学习交互式概念图,低先前知识学习者在学习交互式概念图之前加入相关文本学习时的记忆保持成绩和迁移成绩均显著更高;(3)低先前知识学习者通过层次结构概念图学习的记忆保持成绩和迁移成绩好于通过网状结构概念图学习的成绩。结果表明,学习者的先前知识影响其通过不同类型概念图学习科学说明文的效果;加入相关文本和采用层次结构呈现形式均可有效促进低先前知识者通过交互式概念图学习科学说明文的效果。     

文本结构和时间应激对网页阅读绩效的影响

探讨了文本结构和时间应激对网页阅读绩效的影响效应。采用 2× 3被试间设计 ,自变量为文本结构和阅读时间 ,因变量为找到相关信息的时间及途径的额外节点数。结果发现 ,主效应及交互作用的影响均十分显著。其中 ,当阅读时间为 10和 2 0min时 ,超文本阅读的绩效均显著低于线性文本 ,而在 30min时两者无显著差异 ;对超文本 ,三种阅读时间的效应存在显著差异 ,而对线性材料 ,阅读时间的效应无显著差异。结论 :时间应激对超文本阅读绩效的影响更为明显     

背景信息导航帮助和认知风格对超文本使用的影响

本文考察了背景信息导航帮助(结构背景信息导航帮助、时间背景导航信息帮助和综合背景信息导航帮助)和认知风格(场独立倾向和场依存倾向)对超文本使用过程中导航绩效和学习效果的影响。结果表明：(1)认知风格是研究超文本系统的一个敏感指标：在超文本阅读过程中,场依存倾向的人比场独立倾向的人容易迷失,在某种程度上,学习效果要低于场独立倾向的人;(2)最优路径偏离可以敏感地反映出超文本网络空间中使用者的迷失程度;(3)主观迷失感与导航绩效相比,更能有效地预测超文本环境下的学习效果。     

结构、任务类型和导航对超文本信息搜索的影响

通过两个实验考察了结构、任务类型和导航对超文本信息搜索绩效的影响。实验一采用2（层次结构,混合结构）×2（特定任务,关系任务）的被试内设计,探讨了超文本结构和任务类型对信息搜索的影响;实验二在实验一的基础上,采用2（层次结构,混合结构）×2（有导航图,无导航图）的被试内设计,考察超文本结构和导航对关系任务信息搜索的影响。结果表明：（1）超文本结构和任务类型对信息搜索绩效有显著的交互影响,就关系任务而言,混合结构超文本优于层次结构超文本,但就特定任务而言,两者无显著差异;（2）导航对信息搜索行为有指导作用,尤其对层次结构超文本有利;（3）两种主观指标的结果与客观指标存在一定程度的一致性。     

Strategies in the Information Search Process: Interaction Among Task Structure,Knowledge, and Source

The authors explored the information search strategies of 145 individuals in the predecisional stage. Decision-making participants selected pieces of information from a list including relevant and irrelevant data. The authors investigated the influence of the individual's knowledge and information source. In Experiment 1, the authors experimentally manipulated the information source reliability. The results revealed that participants tended to use a sequential strategy when the authors presented information as supplied by a reliable source. In Experiment 2, the authors analyzed the interaction between information source and the individuals' knowledge. When participants believed the source to be reliable, even knowledgeable participants adopted a strategy as sequential as that chosen by naive individuals. In Experiment 3, a mediational model corroborated the hypothesis that the search strategy affects the final judgment. The results were consistent with the constructivist framework, which emphasizes the role of individual, task, and context in the decision-making process.     

声旁类型与频率在汉字和部件识别中的交互作用

用识别整字和识别部件两种任务探讨两种声旁频率——组字频率和使用频率的作用。结果发现：在局部识别中声旁使用频率的影响和部件类型有交互作用。声旁使用频率对识别汉字单部件声旁有易化作用。声旁组字频率的影响和部件类型有交互作用。声旁组字频率对识别汉字多部件组合声旁有易化作用。在整字识别中,声旁的使用频率有易化作用;声旁的组字频率的作用受到部件类型的影响,多部件组合声旁的组字频率对识别整字有易化作用。     

Relationship of Type of Product, Shopping Orientations, and Demographics with Preference for Shopping on the Internet

This research examines whether (1) consumers' shopping orientations are significantly related to their preference for shopping online, (2) consumers' demographic characteristics are significantly related to preference for shopping online, (3) relationships of shopping orientation and demographic variables with purchase preferences on the Internet will vary by the type of products (i.e., search, experience, or credence). Deriving from the product classification theory, products are classified into four categories: search products, two types of experience products, and credence products. Data were collected through self-administered surveys from adult population in two metropolitan areas in the Southern United States. The findings significantly support the study's hypotheses that shopping orientations such as convenience and recreational shopper and demographic variables such as gender, education, and household income were significantly related to consumer's online purchase preference. The researchers' findings also confirm that the relationships of shopping orientation and demographic variables with purchase preference for shopping online significantly differ by product category. More specifically, convenience and recreational orientations were positively related to preference for shopping online for experience-1, experience-2, and credence product types, though the directional relationship between recreational shopper orientation and preference for shopping on the Internet was positive rather than negative as hypothesized. The results and discussion section also includes implications drawn from the findings.     

Performance and Private Speech of Children with Attention-Deficit/Hyperactivity Disorder While Taking the Tower of Hanoi Test: Effects of Depth of Search,Diagnostic Subtype,and Methylphenidate

We administered the Tower of Hanoi to demographically comparable samples of control participants (n = 34) and children with the Combined (n = 22) and Inattentive subtypes (n = 19) of Attention-Deficit/Hyperactivity Disorder (ADHD). Controls excelled over children with the Inattentive subtype, who outperformed patients with the Combined subtype. These results replicated findings of greater executive deficits in the Combined than in the Inattentive type of ADHD. Double-blind administration of methylphenidate improved task performance only for patients with the Inattentive subtype. In a drug-free Baseline session, children with both subtypes of ADHD made more private verbalizations than controls, particularly when failing puzzles. In later sessions, regardless of drug condition, the inattentive sample exhibited a smaller increase in self-regulatory utterances under failure. In contrast, the combined sample decreased self-regulatory verbalizations under failure only under methylphenidate. The results support some differences between the two subtypes of ADHD in executive functioning and in their response to stimulant therapy. Portions of these results were submitted as part of H. Theresa Chang's PhD dissertation (Chang, 2000) and Helena Kopecky's unpublished master's research, both conducted at the University of Rochester and supervised by Rafael Klorman.     

Effects of instructions, biofeedback, reward, and cognitive mediation on the control of heart rate and the application of that control in a stressful situation

Subjects in Phase 1 of this experiment were (a) instructed to try to either increase or decrease their heart rate, (b) with or without the use of biofeedback, and (c) with or without the promise of money for successful performance, whereas no-treatment subjects were given no instructions, no biofeedback, and no promise of reward. Results indicated that (a) when simply instructed to do so, subjects could increase but not decrease their heart rates relative to no treatment controls, (b) the promise of money for good performance aided subjects in increasing but not decreasing heart rate, and (c) biofeedback did not aid subjects in either increasing or decreasing heart rate. Various cognitive strategies employed by subjects in controlling their heart rates are discussed.In Phase 2, subjects in a stress condition were told that they would receive a series of painful electric shocks, whereas subjects in a no stress condition were not told about shocks. All subjects were instructed to try to decrease their heart rates during the “shock” period. Heart rate and self report data revealed that (a) the manipulation was successful in increasing stress, and (b) previous training in decreasing heart rate, with or without biofeedback, did not aid subjects in decreasing their heart rates in the face of the stress.