编码与提取干扰对内隐和外显记忆的非对称性影响

以往研究表明在外显记忆中,编码与提取加工存在着非对称性,但在内隐记忆中,二者的关系并不明确,因此实验采用“学习-再认”范式,考察在编码或提取中分别附加的干扰任务对词汇判断或再认产生的影响。结果证实编码与提取干扰对内隐或外显记忆都具有非对称性的影响,但又存在着差异,即编码干扰会导致随后外显记忆成绩显著减少,而提取干扰对其影响较小,相反,编码干扰对随后内隐测验中启动效应的影响较小,但提取干扰会破坏启动效应,从而为内隐记忆和外显记忆的分离提供了进一步的证据     

提取练习在定向遗忘中的作用

根据汉字特点采用义同、形似、音同、无关四种实验材料,采用字表范式探讨不同提取练习次数(0、1、3次)在定向遗忘中的作用及是否会受到材料关系的影响.实验结果发现: (1)对于形似、音同材料,提取练习提高了最后回忆成绩.对于义同、无关材料,提取练习对不同组别两列字表的最后回忆成绩影响不同; (2)提取练习0次时,义同、音同、无关材料都表现出定向遗忘效应.提取练习1次时,无关材料表现出定向遗忘效应.提取练习3次时,形似、音同材料下表现出定向遗忘效应.义同、无关材料定向遗忘效应随着提取练习次数的增加而消失,形似材料随着提取练习次数的增加出现定向遗忘效应; (3)对于四种材料,遗忘组被试都没有随提取练习次数的增加而更多抑制字表1回忆,即字表l的回忆成绩都没有表现出随提取练习次数的增加而降低的趋势,所以能否用提取诱发遗忘来解释定向遗忘的提取抑制还需要进一步的实验验证.     

不同学习成绩的小学生有意遗忘过程的实验研究

该研究的实验材料为单字和双字词,利用字表方式呈现。被试为小学六年级的30名学生,按学习成绩好和差各选15名。实验结果为,（1）对单字材料,被试既对要记忆的项目进行了有意的复述,又对指示遗忘的材料产生了提取抑制;对双字词材料,被试只有对指示遗忘的材料产生提取抑制,而没有对要记忆的项目进行有意复述;（2）学习成绩好的学生的有意遗忘的抑制能力明显高于学习成绩差的学生。     

定向遗忘影响延时测验吗

延时测验中是否存在定向遗忘效应一直是研究者们争论的焦点。因此,本文用汉语的低频单字作为材料,通过引入保持期变量（即时．延时）．以再认和偏好作为外显和内隐记忆测验束考察定向遗忘是否影响延时测验。     

Sequential sampling models of human text classification

Text classification involves deciding whether or not a document is about a given topic. It is an important problem in machine learning, because automated text classifiers have enormous potential for application in information retrieval systems. It is also an interesting problem for cognitive science, because it involves real world human decision making with complicated stimuli. This paper develops two models of human text document classification based on random walk and accumulator sequential sampling processes. The models are evaluated using data from an experiment where participants classify text documents presented one word at a time under task instructions that emphasize either speed or accuracy, and rate their confidence in their decisions. Fitting the random walk and accumulator models to these data shows that the accumulator provides a better account of the decisions made, and a “balance of evidence” measure provides the best account of confidence. Both models are also evaluated in the applied information retrieval context, by comparing their performance to established machine learning techniques on the standard Reuters‐21578 corpus. It is found that they are almost as accurate as the benchmarks, and make decisions much more quickly because they only need to examine a small proportion of the words in the document. In addition, the ability of the accumulator model to produce useful confidence measures is shown to have application in prioritizing the results of classification decisions.     

Retrograde amnesia: forgetting back

Recently, the field of animal memory research has seen a resurgence of interest in the mechanisms underlying retrograde amnesia (RA) and in the use of RA as a technique for studying memory processes. A recent report from a major neuroscience lab, which demonstrated RA for an old reactivated memory, revitalized the debate regarding the widely accepted memory-consolidation theory of RA. Here, we discuss a number of the characteristics of RA and consider the findings that led to the development of the memory-consolidation hypothesis, as well as those suggesting an alternative retrieval-deficit explanation.     

Aging and Language Production

Experimental research and older adults' reports of their own experience suggest that the ability to produce the spoken forms of familiar words declines with aging. Older adults experience more word-finding failures, such as tip-of-the-tongue states, than young adults do, and this and other speech production failures appear to stem from difficulties in retrieving the sounds of words. Recent evidence has identified a parallel age-related decline in retrieving the spelling of familiar words. Models of cognitive aging must explain why these aspects of language production decline with aging whereas semantic processes are well maintained. We describe a model wherein aging weakens connections among linguistic representations, thereby reducing the transmission of excitation from one representation to another. The structure of the representational systems for word phonology and orthography makes them vulnerable to transmission deficits, impairing retrieval.     

Intentional and Skillful Neurons

Abstract

In the mid-1990s, there was a major neuroscientific discovery which might drastically alter sport science in general and philosophy of sport in particular. The discovery of mirror neurons by Giacomo Rizzolatti and colleagues in Parma, Italy, is a substantial contribution to understanding brains, movements, and humans. Famous neuroscientist V. S. Ramachandran believes the discovery of mirror neurons ‘will do for psychology what DNA did for biology’ (http://www.edge.org/3rd_culture/ramachandran/ramachandran_p1.html). Somehow mirror neurons have not received the deserved attention in the philosophy of sport, but perhaps now is the time to reflect on some implications and consequences. The discovery of mirror neurons may increase our insights about our ability to learn, understand, intend, and produce skillful motor actions. In this article I will first examine what mirror neurons are and how they function in monkeys and humans. Second, I will review some objections to the so-called mirror neuron theory of action understanding, and try to reconcile some of these objections. Third, I will inquire into some implications for philosophy, which I believe are also fundamental to several topics in the philosophy of sport. I will then try to relate some of the most interesting aspects of mirror neurons to recent debates in the philosophy of sport. Finally, I will speculate on what further neuroscientific research might teach us about the nature of being a moving subject.     

Does retrieval practice depend on semantic cues? Assessing the fuzzy trace account of the testing effect

Retrieval practice enhances long-term retention more than restudying; a phenomenon called the testing effect. The fuzzy trace explanation predicts that a testing effect will already emerge after a short interval when participants are solely provided with semantic cues in the final test. In the present study, we assessed this explanation by gradually reducing the surface features overlap between cues in the learning phase and the final recognition test. In all five experiments, participants in the control/word condition received as final test cues the same words as in the learning phase. The experimental final test cues consisted of scrambled words, words in a new context, scrambled words in a new context (Experiment 1), synonyms (Experiment 2), or images (Experiments 3, 4a, 4b). A short-term testing effect was only observed for the image final test cues. These results do not provide strong support for the fuzzy trace explanation of the testing effect.