动态图像对文本学习的作用研究

本研究通过实验考察了计算机动态图像对文本学习的作用,发现其作用既与学习材料的性质有关,也与评价学习的方法有关。动态图像对具体性文本材料的理解、识记和保持都无明显作用;而对抽象性文本材料的理解有明显帮助,进而促进记忆的保持效果,其作用明显大于印刷品条件静止图像的作用。但对抽象性文本材料中关键词的识记则有明显不利的影响。     

From molecular to molar: a paradigm shift in behavior analysis

A paradigm clash is occurring within behavior analysis. In the older paradigm, the molecular view, behavior consists of momentary or discrete responses that constitute instances of classes. Variation in response rate reflects variation in the strength or probability of the response class. The newer paradigm, the molar view, sees behavior as composed of activities that take up varying amounts of time. Whereas the molecular view takes response rate and choice to be "derived" measures and hence abstractions, the molar view takes response rate and choice to be concrete temporally extended behavioral allocations and regards momentary "responses" as abstractions. Research findings that point to variation in tempo, asymmetry in concurrent performance, and paradoxical resistance to change are readily interpretable when seen in the light of reinforcement and stimulus control of extended behavioral allocations or activities. Seen in the light of the ontological distinction between classes and individuals, extended behavioral allocations, like species in evolutionary taxonomy, constitute individuals, entities that change without changing their identity. Seeing allocations as individuals implies that less extended activities constitute parts of larger wholes rather than instances of classes. Both laboratory research and everyday behavior are explained plausibly in the light of concrete extended activities and their nesting. The molecular- view, because it requires discrete responses and contiguous events, relies on hypothetical stimuli and consequences to account for the same phenomena. One may prefer the molar view on grounds of elegance, integrative power, and plausibility.     

Subcellular interactions between parallel fibre and climbing fibre signals in purkinje cells predict sensitivity of classical conditioning to interstimulus interval

Classical conditioning of the nictitating membrane response requires a specific temporal interval between conditioned stimulus and unconditioned stimulus, and produces an incrase in Protein Kinase C (PKC) activation in Purkinje cells. To evaluate whether biochemical interactions within the Purkinje cell may explain the temporal sensitivity, a model of PKC activation byCa ²⁺, diacylglycerol (DAG), and arachidonic acid (AA) is developed.Ca ²⁺ elevation is due to CF stimulation and IP3 inducedCa ²⁺ release (IICR). DAG andIP ₃ result from PF stimulation, while AA results from phospholipase A2 (PLA ₂). Simulations predict increased PKC activation when PF stimulation precedes CF stimulation by 0.1 to 3 s. The sensitivity of IICR to the temporal relation between PF and CF stimulation, together with the buffering system of Purkinje cells, significantly contribute to the temporal sensitivity.     

Function transfer in human operant experiments: the role of stimulus pairings

Although function transfer often has been studied in complex operant procedures (such as matching to sample), whether operant reinforcement actually produces function transfer in such settings has not been established. The present experiments, with high school students as subjects, suggest that stimulus pairings can promote function transfer in conditions that closely approximate those of matching to sample. In Experiment 1, the subjects showed transfer of operant responding from three geometric figures (C1, C2, C3) to three colored shapes (B1, B2, B3) when the latter were paired with the former. Experiment 2 involved two groups of subjects. In the matching group, subjects matched the colored shapes with the geometric figures; in the yoked group, the shapes were merely paired with the geometric figures, and the schedule of stimulus pairing was yoked to the performance of the subjects in the matching group. Both groups of subjects showed function transfer. Experiment 3 documented function transfer from C stimuli to B stimuli through indirect stimulus pairings (A-B, A-C). In Experiment 4, function transfer was obtained even though the subjects vocalized continuously during the pairing trials, presumably preventing covert verbalization that might mediate transfer effects. Our results are consistent with a Pavlovian account and raise difficulties for current operant theories of function transfer.     

Outcomes of a practical approach for improving conversation skills in adults with autism

Many individuals with autism spectrum disorder (ASD) have deficits in conversation skills that can interfere with the development of personal and professional relationships. Further research is needed on efficient interventions for targeting conversation skills in adults with ASD and for evaluating the social validity of the outcomes. In this study, 2 practitioners implemented a 4‐week training program for 5 adults with ASD that combined individualized computer‐based instruction (CBI) and practice with peers to promote the acquisition, maintenance, and generalization of conversation skills. Training was associated with improvements in 12 of 13 skills across participants. These findings, along with peer ratings of the participants' conversation skills, suggest that this model is a promising, socially valid approach for improving conversation skills in adults with ASD.     

Behavioral control by the response–reinforcer correlation

Using a discrete‐trials procedure, two experiments examined the effects of response–reinforcer correlations on responding while controlling molecular variables that operated at the moment of reinforcer delivery (e.g., response–reinforcer temporal contiguity, interresponse times preceding reinforcement). Each trial consisted of three successive components: Response, Timeout, and Reinforcement, with the duration of each component held constant. The correlation between the number of responses in the Response component and reinforcer deliveries in the Reinforcement component was varied. In the Positive‐correlation condition, a larger number of responses in the Response component programmed a higher reinforcement rate (Experiment 1) or a shorter time to reinforcement (Experiment 2) in the Reinforcement component. Although programmed in this way, the actual reinforcer delivery was dependent on, and occurred immediately after, a response in the Reinforcement component. In the Zero‐correlation condition, the programmed rates of reinforcement (Experiment 1) or the times to reinforcement (Experiment 2) in the Reinforcement component of each trial were yoked to those in the preceding Positive‐correlation condition. Responding in the Response component was higher in the Positive‐ than in the Zero‐correlation condition, without systematic changes in molecular variables. The results suggest that the response–reinforcer correlation can be a controlling variable of behavior.     

A Model for Predicting Computer Experience from Attitudes Toward Computers

This study examined the relationship between locus of control, two sets of beliefs about computers as electronic performance monitors, general computer attitudes, and computer experience. Results support a model in which computer attitudes mediate the relationship between an individual's locus of control and computer experience and between monitoring beliefs about computers and computer experience.     

人类基因组计划中的计算机科学

叙述了人类基因组计划（HGP）实施过程中计算机科学向基因组学领域的不断渗透及面临的挑战。基因组数据库及网络系统的构建与完善为基因组信息的交流提供了基础,一系列计算机软件的开发和改进简化了HGP这一繁重的劳动。在HGP的推动下,世界各大信息技术公司也加盟到基因组研究中,使生物学中融入了更多的计算机专业技能,有利于引进新的思维模式,开拓新的研究方法。但目前在基因组信息的交流与分析方面,标准化和精确性仍显不足,信息的处理能力也受到计算机存储量和运算速度的制约,这些问题将随着计算机科学的不断发展而逐渐解决。     

电脑游戏与青少年问题行为、家庭各因素的关系研究

本研究着眼于探讨6、8、10年级的中学生的电脑游戏活动,以及游戏时间、游戏暴力程度、行为问题、父母教养方式、家庭收入等因素的相互作用。结果显示,6年级学生较之8和10年级学生有较少的行为问题。研究也发现,学生玩游戏时间越多,玩游戏的历史越长,具有行为问题的可能性越多。此外,那些游戏暴力指数较高的学生所得到的来自父母的温暖指数较少,有较多的问题行为。在游戏的暴力指数方面,女孩比男孩要低得多。父亲教养方式中的温暖和惩罚因子、母亲教养方式中的温暖、椎绡和惩罚因子可用于预测孩子的问题行为。