Enhancing dynamic graphical analysis with the Lisp-Stat language and the ViSta statistical program

Presented is a sample of computerized methods aimed at multidimensional scaling and psychometric item analysis that offer a dynamic graphical interface to execute analyses and help visualize the results. These methods show how the Lisp-Stat programming language and the ViSta statistical program can be jointly applied to develop powerful computer applications that enhance dynamic graphical analysis methods. The feasibility of this combined strategy relies on two main features: (1) The programming architecture of ViSta enables users to add new statistical methods as plug-ins, which are integrated into the program environment and can make use of all the functions already available in ViSta (e.g., data manipulation, editing, printing); and (2) the set of powerful statistical and graphical functions integrated into the Lisp-Stat programming language provides the means for developing statistical methods with dynamic graphical visualizations, which can be implemented as ViSta plug-ins.     

Cognitive colonialism: Nationality bias in Brazilian academic philosophy

This paper presents the results of an experiment designed to test for nationality bias among members of the Brazilian philosophical community. Faculty members and postgraduate students from philosophy departments at seven Brazilian universities evaluated texts attributed to authors of European and Latin American nationalities. Results showed a clear preference for French nationality over Brazilian. They were inconclusive, however, when contrasting other Latin American nationalities with European nationalities, which likely relates to the academic background of the participants. These overall results support the claim that Brazilian academic philosophers are highly critical of Brazilians who produce theories of their own. The paper calls on philosophers to carefully consider the ways in which Eurocentrism impacts their very ability to reason.     

If-Logic and Truth-definition

In this paper we show that first-order languages extended with partially ordered connectives and partially ordered quantifiers define, under a certain interpretation, their own truth-predicate. The interpretation in question is in terms of games of imperfect information. This result is compared with those of Kripke and Feferman.     

‘Zeitgeist’and minority influence—where is the causality: A comment on Clark (1990)

Does the mood of the time (Zeitgeist) facilitate the influence minorities are able to exercise, or is it itself direct product of minority influence? It is argued, from a social psychological definition of the minority–majority relation, that the former interpretation fails to explain many of the observed effects and in particular the conversion effect. A model is offered that is consistent with the second interpretation.     

Synchronic consistency and psychologization in minority influence

The importance of synchronic consistency as a factor facilitating minority influence had not previously been the object of a systematic study. We carried out a 2 × 2 × 2 × 2 experiment aimed at studying the consequences of a) ideological similarity or dissimilarity of two minority sources belonging to b) a single minority or two different ones, on subjects c) ideologically both close and distant from positions defended by the influence sources, d) according to the absence or presence of psychologization. In the main, our hypotheses were confirmed. As expected concerning the ‘close’ subjects, in the absence of psychologization, the similarity and dissimilarity between minority sources take over, respectively, the signification of consistency and inconsistency and, consequently, increase or decrease the influence exerted by the minority sources. Psychologization decreases the benefits of synchronic consistency. Contrariwise, the ‘distant’ subjects did not seem to follow the same ‘logic’: the condition of opinion dissimilarity in the same minority is the most influential; its influence, however, diminishes when the divergence of opinion is explained by means of a psychological dissimilarity. Data related to the image of the sources indicate that the influence process is no longer determined by perceived consistency or inconsistency, but by the objectivity attributed to minorities. Under these circumstances, intra-minority pluralism became the guaranteer of objectivity.     

The cotherapy relationship: Special issues and problems in aids therapy groups

This paper examines the special issues and problems in the co-leadership relationship which arise in ongoing AIDS therapy and support groups. A brief review is given outlining some of the advantages and disadvantages of the coleader model. Specific attention is then paid to the issues/themes of physical deterioration of members, disfigurement, frequent absences, and members dying. Four particular patterns of interaction that develop between cotherapists are identified, illustrated, and discussed.The author thanks the Group Services staff and volunteer therapists for their contributions to this article.     

Direct and indirect influence in the Asch paradigm: Effects of ‘valid’ or ‘denied’ information

In an experiment using the Asch paradigm, a source whose response was ‘denied’ (source younger than subjects, in an experiment context implying the development of visual acuity) was found to have less direct influence than a ‘validated’ source (older or same age as subjects), tending to specialize in a pattern of influence similar to the so-called conversion phenomenon (i.e. direct influence only).     

The role of stimulus comparison in perceptual learning: An investigation with the domestic chick

In two experiments an imprinting procedure was used to familiarize chicks with two stimuli, A and B, that subsequently served as the discriminanda in a simultaneous discrimination. On the first day of each experiment, subjects either received presentations of A and B that were intermixed within a session (mixed exposure) or presentations of A in one session and of B in another (separate exposure). For half of the subjects in each of the exposure conditions, A and B differed in both colour and form; for the remainder A and B differed in form alone. On the second day of the experiments, the chicks were placed into a cool test apparatus and given training in which approaching A was rewarded by the delivery of a stream of warm air, but approaching B was not. Acquisition of this discrimination was more rapid when A and B differed in two respects than when they differed in form alone. When A and B differed in both colour and form, the heat-reinforced discrimination was acquired more rapidly after separate exposure than after mixed exposure; but when A and B differed in form alone, discrimination learning was more rapid following mixed exposure than separate exposure. The latter finding, that the opportunity to compare stimuli differing in only one dimension facilitates subsequent discrimination learning, is consistent with earlier suggestions (Gibson, 1969) regarding the conditions that promote perceptual learning.     

Reduction of inflammatory pain in female rats after NR2B NMDA cortical antagonism

Studies have shown that N-methyl-D-aspartate (NMDA) receptors play a critical role in pain processing at different levels of the central nervous system. In this study, we used female adult Wistar rats to examine the effects of antagonizing the NR2B subunit of the NMDA receptor in phasic and tonic pain processes. All the rats underwent stereotaxic surgery for cortical cannula implantation and after at least one week of recovery, rats performed behavioral tests. For evaluating the effects of drugs on motor coordination rats were tested in the rotarod apparatus. Moreover, rats were evaluated in the paw withdrawal latency (PWL) to a noxious thermal stimulus. Furthermore, rats were tested in the formalin-pain test. Rats that received the NR2B antagonist Ro 25-6981 before and after formalin injection showed significantly reduced pain responses in the formalin test, as compared with female control rats (p<0.05). In contrast, no differences among groups were found in the phasic pain test (Hargreaves) and the rotarod test. Taken together, these results suggest that cortical antagonism of the NR2B subunit of NMDA receptors is able to reduce inflammatory pain levels not only before, but after the formalin injection in females at different phases of the estrous cycle.     

Grapheme–color synesthesia can enhance immediate memory without disrupting the encoding of relational cues

Previous evidence has suggested that grapheme–color synesthesia can enhance memory for words, but little is known about how these photisms cue retrieval. Often, the encoding of specific features of individual words can disrupt the encoding of ordered relations between words, resulting in an overall decrease in recall accuracy. Here we show that the photisms arising from grapheme–color synesthesia do not function like these item-specific cues. The influences of high and low word frequency on the encoding of ordered relations and the accuracy of immediate free recall were compared across a group of 10 synesthetes and 48 nonsynesthetes. The main findings of Experiment 1 showed that the experience of synesthesia had no adverse effect on the encoding of ordered relations (as measured by input–output correspondence); furthermore, it enhanced recall accuracy in a strictly additive fashion across the two word frequency conditions. Experiment 2 corroborated these findings by showing that the synesthetes only outperformed the nonsynesthetes when the materials involved words and letters, not when they involved digits and spatial locations. Altogether, the present findings suggest that synesthesia can boost immediate memory performance without disrupting the encoding of ordered relations.