Geometric analogue of holographic reduced representation

Holographic reduced representations (HRRs) are distributed representations of cognitive structures based on superpositions of convolution-bound n-tuples. Restricting HRRs to n-tuples consisting of ±1, one reinterprets the variable binding as a representation of the additive group of binary n-tuples with addition modulo 2. Since convolutions are not defined for vectors, the HRRs cannot be directly associated with geometric structures. Geometric analogues of HRRs are obtained if one considers a projective representation of the same group in the space of blades (geometric products of basis vectors) associated with an arbitrary n-dimensional Euclidean (or pseudo-Euclidean) space. Switching to matrix representations of Clifford algebras, one can always turn a geometric analogue of an HRR into a form of matrix distributed representation. In typical applications the resulting matrices are sparse, so that the matrix representation is less efficient than the representation directly employing the rules of geometric algebra. A yet more efficient procedure is based on ‘projected products’, a hierarchy of geometrically meaningful n-tuple multiplication rules obtained by combining geometric products with projections on relevant multivector subspaces. In terms of dimensionality the geometric analogues of HRRs are in between holographic and tensor-product representations.     

Improving the image of student‐recruited samples: A commentary

This commentary argues that the quality and usefulness of student‐recruited data can be evaluated by examining the external validity and generalization issues related to this sampling method. Therefore, we discuss how the sampling methods of student‐ and non‐student‐recruited samples can enhance or diminish external validity and generalization. Next, we present the advantages of the student‐recruited sampling method (heterogeneity of the sample, student learning, cost reduction, and elaborate research designs) and conclude with making additional suggestions on how to improve the quality of these data.     

Self‐focused attention and social anxiety

Cognitive models propose that self‐focused attention (SFA) interacts with fear of negative evaluation to maintain social anxiety. Thus, the effect of SFA on anxiety would be expected to be specific to those with existing social concerns. However, much research suggests that the effect of SFA on anxiety occurs across anxiety levels. Manipulations of attention focus have been criticised for (1) lack of ecological validity and (2) eliciting fear of negative evaluation directly. The present study examined the role of SFA in social anxiety using an ecologically valid procedure that did not elicit fear of negative evaluation directly. Self‐reported anxiety was assessed among high and low socially anxious individuals under conditions of SFA or external‐focused attention. The manipulation successfully altered focus of attention but did not directly affect fear of negative evaluation or self‐reported anxiety. Taken together with the findings of previous studies, the results suggest that focusing on internal physiological states per se does not increase self‐reported social anxiety, and that self‐focus that does not have an explicitly evaluative dimension does not elicit social anxiety. The findings have implications for approaches to reducing social anxiety through reducing SFA.     

临终关怀与内隐自尊的修复:现象、机制及意义

内隐自尊是自发的、自动的、无意识地自我评价系统.临终关怀系统与临终个体的心理健康、生活幸福感密切相关,人文社会科学已渗透临终关怀研究领域.通过回顾临终关怀与内隐自尊系统的社会表征及研究的现状,并从中揭示出临终关怀与内隐自尊的修复可能的机制及意义.     

Multisensory spatial representations in eye-centered coordinates for reaching

Humans can reach for objects with their hands whether the objects are seen, heard or touched. Thus, the position of objects is recoded in a joint-centered frame of reference regardless of the sensory modality involved. Our study indicates that this frame of reference is not the only one shared across sensory modalities. The location of reaching targets is also encoded in eye-centered coordinates, whether the targets are visual, auditory, proprioceptive or imaginary. Furthermore, the remembered eye-centered location is updated after each eye and head movement. This is quite surprising since, in principle, a reaching motor command can be computed from any non-visual modality without ever recovering the eye-centered location of the stimulus. This finding may reflect the predominant role of vision in human spatial perception.     

Names,concepts, features and the living/nonliving things dissociation

The present paper evaluates different hypotheses for explaining the living/nonliving things dissociation phenomenon in terms of feature type, considering the role of this dimension in the organization of conceptual semantic representations and in the activation of name representations. For this purpose we used Sloman and associates' (Memory and Cognition 27(3) (1999) 526; Cognitive Science 22(2) (1998) 189) name centrality and conceptual centrality tasks and asked subjects to judge functional and perceptual/visual features of living and nonliving items. Conceptual centrality results are more in accordance with a "single feature-domain connection hypothesis" where visual features are more important than functional features for the representation of living things and no feature type advantage is found for nonliving things. Name centrality results show that functional features are more important than sensory/visual features overall, a result that is not predicted by any of the hypotheses considered. The fact that the two judgments diverge emphasizes their importance for evaluating the role of feature type in the living/nonliving dissociation. Implications for explaining this phenomenon are also discussed.     

The Violation of Inner and Outer Boundaries in Political Persecution

One of the consequences of persecution for the individual is the experienced confusion of inner and outer worlds. With the help of a broadened concept of the transitional space, derived from Winnicott, we could understand the various psychological consequences of structural physical violence. The violation of the transitional space during physical violence can result in a transformation to an inorganic state, an introjection or incorporation of the bad object into the self, intrusive re-experiencing and shattered assumptions often seen long after psychotrauma. In this article a broadened and elaborated concept of transitional space is described. Therefore, several theoretical concepts, such as inner and outer world are discussed and defined which makes it possible to put them into practice of psychotherapy and research. An example is given of a documented case of imprisonment under extreme conditions in which the prisoners were able to build up a common transitional space in order to survive. In this case, the transitional space is not an aid for the passage from one developmental phase to another, but instead a way of keeping open the connection between the psychic inner world, the world of the prison and the free world outside the prison walls. It is suggested to extend the concept of the transitional space to this meaning.     

History Matters: Effects of Culture‐specific Symbols on Political Attitudes and Intergroup Relations

A theory of the historical anchoring and mobilization of political attitudes is proposed, arguing that culture‐specific symbols, configured by historical charters, are an important resource in defining nationhood and legitimizing public opinion in a way that makes some political attitudes difficult to change. Five studies in New Zealand and Taiwan using diverse methods converged to show that historical events with “charter status” have an additive effect in explaining variance in political attitudes regarding biculturalism in New Zealand and independence in Taiwan even after controlling for the effects of Social Dominance Orientation, Right‐Wing Authoritarianism, relevant social identities, and collective guilt. Field and lab experiments showed that the impact of historical symbols did not depend on the mobilization of social identity (e.g., increasing mean scores and indirect effects), but the historical anchoring of political attitudes in representations was resistant to change. Manipulations of the salience of historical events changed levels of social identification, but did not change mean levels of support for New Zealand biculturalism or Taiwanese independence. Even an intense and immersive pretest/posttest design taking high school students on a national museum tour failed to change attitudes towards biculturalism in New Zealand.     

Interethnic Factors as Predictors of the Subjective Well‐Being of Minority Individuals in a Context of Recent Societal Changes

Our research examined the impact of contextual intergroup variables on the subjective well‐being of ethnic Russians in Estonia (N = 190) who have experienced major social changes with the demise of the Soviet Union. A mediational model was tested where aspects of intergroup relations (i.e., relative deprivation, status legitimization, and temporal comparisons) acted as mediators of the influence of cultural identity and representations of history on subjective well‐being. Preliminary analyses indicated polemical representations of history in which Estonian historical narratives are established around the struggle for independence, and Russian representations of history are consolidated around victory in World War II. Mediation analyses demonstrated that the importance of Russian history increased the perceptions of relative deprivation, status delegitimization, and the frequency of temporal comparisons, which negatively affected life satisfaction. At the same time, the importance of Estonian history led to positive perceptions of the intergroup situation and, in turn, to greater subjective well‐being. The effect of Russian identity on well‐being was mediated by delegitimizing beliefs, but not by relative deprivation and temporal comparisons. Estonian identity did not exert a significant effect on the proposed mediators. The research demonstrates the salience of the effects of contextual intergroup factors on subjective well‐being, and the article discusses implications for the study of intergroup relations and subjective well‐being.     

骨外固定——微创肢体重建的利器

骨外固定以其独特的环形、铰链和螺杆等的简单构型,用于复杂创伤及创伤后遗症,复杂的肢体畸形的治疗,可以获得其他方法不可比拟的效果,堪称肢体重建的一把利器.本文从以胫腓骨中段的短斜型闭合骨折为例,详细阐述了外固定器治疗骨折的优势.以复杂的足踝畸形病例为例,阐释了以Ilizarov技术为代表的骨外固定用于肢体畸形矫正并创造神奇效果的秘密.骨外固定顺应了肢体损伤、肢体畸形发生发展的客观规律,由外而内,提供一个适宜的重建方向,符合生物学要求,可以实现骨与软组织的自然修复与重建.