Multidimensional unfolding analyses of ranking data for groups

One probabilistic version of Coombs' unfolding model called the MMUR (Marginalization model for the Multidimensional Unfolding analysis of Ranking data) is extended to treat ranking data for groups. One favorable feature of the model is that it can both take into consideration individual differences without estimating the subject parameters and capture the differences between the groups in a systematic manner. Another advantage lies in the fact that one can see the group differences in the geometrical point configuration, since the model shows how the ideal points of the groups differ from each other in space. Four applications are provided which demonstrate that the model is useful for clarifying systematic differences in this type of data.     

Rasch models for item bundles

This paper discusses the application of a class of Rasch models to situations where test items are grouped into subsets and the common attributes of items within these subsets brings into question the usual assumption of conditional independence. The models are all expressed as particular cases of the random coefficients multinomial logit model developed by Adams and Wilson. This formulation allows a very flexible approach to the specification of alternative models, and makes model testing particularly straightforward. The use of the models is illustrated using item bundles constructed in the framework of the SOLO taxonomy of Biggs and Collis.The work of both authors was supported by fellowships from the National Academy of Education Spencer Fellowship.     

Posterior probabilities for a consensus ordering

In the situation where subjects independently rank order a fixed set of items, the idea of a consensus ordering of the items is defined and employed as a parameter in a class of probability models for rankings. In the context of such models, which generalize those of Mallows, posterior probabilities may be easily formed about the population consensus ordering. An example of rankings obtained by the Graduate Record Examination Board is presented to demonstrate the adequacy of these generalized Mallows' models for describing actual data sets of rankings and to illustrate convenient summaries of the posterior probabilities for the consensus ordering.The authors thank Leann Birch for permission to refer to her experiment on cracker preferences, and the Graduate Record Examination Board for permission to use primary data from the Pike Report in our example. We also thank the referees for helpful comments.     

Response-reinforcer independence and the economic continuum: A preliminary analysis

Three pigeons were exposed to 1-hr and 4-hr sessions during which they earned food under a fixed-ratio 50 schedule of reinforcement while obtaining additional food according to either a variable-interval or a variable-time schedule. Postsession food was provided after the 1-hr sessions. The frequency of the variable-interval and variable-time food presentations was varied under the two session durations. The various combinations of within-session earned and unearned food, as well as the postsession food, defined conditions on the open-to-closed economy continuum. Key pecks tended to increase as the frequency of either variable-interval or variable-time food decreased. An economic-continuum analysis based on an independence quotient as a measure of response-reinforcer independence is presented to account for the effects.     

The functional independence of mands and tacts

This study demonstrates functional independence in the acquisition of mands and tacts. Some subjects first learned to mand the experimenter's placement of objects with the prepositional phrases “On the left” and “On the right.” They were regularly tested for collateral appearance of tacts with these same phrases. Other subjects learned to tact the location of objects with these prepositional phrases and were regularly tested for collateral appearance of mands. All subjects were next trained in the repertoire that had not been trained in the first condition (either tact or mand). After all subjects had learned both to mand and to tact correctly, another assessment of mand-tact independence was undertaken. Mands (tacts) were reversed and testing assessed collateral reversal of tacts (mands). The results demonstrated that tacts and mands, even when incorporating identical response forms, were functionally independent during acquisition. Subsequent modification of one repertoire (by reversal training) produced collateral reversal in three of nine subjects.     

Two kings and two kingdoms: the Church of Scotland,the monarchy,national identity and establishment

The debate about Scottish independence raises questions about church–state relations and religious establishment in Scotland as well as about national identity. This article surveys and summarises attitudes in the Church of Scotland on these subjects over the 450 years since the Scottish Reformation. It identifies and explores several key themes, notably the spiritual independence of the church and national recognition of religion. They were hotly debated topics during the reign of King James VI, enshrined in law in the aftermath of the Glorious Revolution and prompted the use of the royal veto by Queen Victoria. The Articles Declaratory of the Church of Scotland, embodied in the Church of Scotland Act of 1921, which provide a unique definition of church establishment, will have to be renegotiated in the event of Scottish independence. There are competing views within the Kirk about the constitutional position of Christianity and more specifically of the Church of Scotland in an independent Scotland.     

A high-loaded hemisphere successfully ignores distractors

We used a response competition paradigm to investigate whether a distractor is effectively rejected under conditions where it is projected to a highly-loaded hemisphere. In two experiments we asked right-handed participants to identify a target among five task-relevant letters while they ignored a distractor. We manipulated both the distractor visual-field (low-load/high-load) and the compatibility of the target and the distractor. In the low-loaded visual-field, we presented a distractor with one task-relevant stimulus to one visual-field and the remaining task-relevant stimuli to the opposite visual-field. In the high-loaded visual-field, we presented a distractor and task-relevant stimuli in reverse. In Experiment 1 (left/right), we found a compatibility effect for the low-loaded, but not for the high-loaded visual-field. In Experiment 2, this modulation of the compatibility effect did not appear when the upper/lower visual-field was manipulated. These findings demonstrate that a distractor is successfully ignored when it is presented to a highly-loaded hemisphere.     

An evaluation of intraverbal training and listener training for teaching categorization skills

The effects of vocal intraverbal training and listener training on the emergence of untrained categorization skills were evaluated. Five typically developing preschool children initially learned to name a number of previously unfamiliar visual stimuli. Each child then received one of two types of training. Intraverbal training involved reinforcing vocally emitted category names by the child in the presence of a spoken exemplar name. Listener training involved reinforcing the selection of visual stimuli by the child in the presence of a spoken category name. A multiple baseline design was used to evaluate the effects of training on each child's intraverbal category naming and stimulus selection. Pre- and posttests were used to assess additional emergent relations. Four of 5 participants did not demonstrate the emergence of any untrained relations. The current findings suggest that additional research is needed to determine the optimal sequencing of conditions in programs designed to teach categorization skills.     

不同认知方式个体图形一致性判断过程中的ERP研究

使用ERP技术对选取的27名右利手大学生（场独立14名,场依存13名）在图形一致性判断过程中的ERP进行分析,结果表明：1）在图形一致性的判断任务中,场依存者的前额叶与中央区在200ms之前的N85与P160峰-峰之差明显大于场独立者,在枕叶区的负波N120波幅明显高于场独立者,这说明场依存者在对图形一致性比较的视觉信息处理的早期阶段即进行了更深度的加工。2）场独立者的N290波幅高于场依存者,而N290潜伏期比场依存者明显的长,这说明场独立者在后期对图形进行了更深入的分析比对。     

面孔知觉中面孔性别与情绪表情的相互作用

面孔知觉中, 面孔性别与表情的加工有不同的机制。Bruce和Young (1986)及Haxby, Hoffman和Gobbini (2000)的面孔知觉理论虽然对表情加工也较为关注, 但对面孔性别加工机制的解释却较少, 也未能明确面孔性别与表情的相互关系。当前关于两者是否独立加工尚无明确结论, 但更多证据支持它们相互影响。我们认为, Garner范式下面孔性别与表情加工的研究可能忽略了面孔熟悉性因素。同时, 面孔适应范式为该研究领域提供了新的思路。此外, 文章对于两者相互作用的机制也进行了一定的探讨。