Object pose: perceiving 3-d shape as sticks and slabs

Estimating the pose (three-dimensional orientation) of objects is an important aspect of 3-D shape perception. We studied the ability of observers to match the pose of the principal axes of an object with the pose of a cross consisting of three perpendicular axes. For objects, we used a long and a flat spheroid and eight symmetric objects with aspect ratios of dimensions of approximately 4:2:1. Stimulus cues were the contour and stereo for the spheroids, and contour, stereo, and shading for the symmetric objects. In addition, the spheroids were shown with or without surface texture and with or without active motion. Results show that observers can perform the task with standard deviations of a few degrees, though biases could be as large as 30 degrees. The results can be naturally decomposed in viewer-centered coordinates, and it turns out that the estimation of orientation in the frontoparallel plane (tilt) is more precise than estimation of orientation in depth (slant, roll). A comparison of long and flat spheroids shows that sticks lead to better performance than do slabs. This can even be the case within the same object; the pose of the stick-like aspect is seen with more precision than is the pose of the slab-like aspect. The largest biases occurred when the spheroids were displayed with the binocular contour as the only cue. We can explain these biases by assuming that subjects' settings are influenced by the orientation of the rim.     

Recognition of interlingual homophones in bilingual auditory word recognition

How do bilinguals recognize interlingual homophones? In a gating study, word identification and language membership decisions by Dutch-English bilinguals were delayed for interlingual homophones relative to monolingual controls. At the same time, participant judgments were sensitive to subphonemic cues. These findings suggest that auditory lexical access is language nonselective but is sensitive to language-specific characteristics of the input. In 2 cross-modal priming experiments, visual lexical decision times were shortest for monolingual controls preceded by their auditory equivalents. Response times to interlingual homophones accompanied by their corresponding auditory English or Dutch counterparts were also shorter than in unrelated conditions. However, they were longer than in the related monolingual control conditions, providing evidence for online competition of the 2 near-homophonic representations. Experiment 3 suggested that participants used sublexical cues to differentiate the 2 versions of a homophone after language nonselective access.     

Friendship Selection and Influence Processes for Physical Aggression and Prosociality: Differences between Single-Sex and Mixed-Sex Contexts

The present study examined to what extent selection and influence processes for physical aggression and prosociality in friendship networks differed between sex-specific contexts (i.e., all-male, all-female, and mixed-sex classrooms), while controlling for perceived popularity. Whereas selection processes reflect how behaviors shape friendships, influence processes reveal the reversed pattern by indicating how friends affect individual behaviors. Data were derived from a longitudinal sample of early adolescents from Chile. Four all-male classrooms (n = 150 male adolescents), four all-female classrooms (n = 190 female adolescents), and eight mixed-sex classrooms (n = 272 students) were followed one year from grades 5 to 6 (M _age = 13). Analyses were conducted by means of stochastic-actor-based modeling as implemented in RSIENA. Although it was expected that selection and influence effects for physical aggression and prosociality would vary by context, these effects showed remarkably similar trends across all-male, all-female, and mixed-sex classrooms, with physical aggression reducing and with prosociality increasing the number of nominations received as best friend in all-male and particularly all-female classrooms. Further, perceived popularity increased the number of friendship nominations received in all contexts. Influence processes were only found for perceived popularity, but not for physical aggression and prosociality in any of the three contexts. Together, these findings highlight the importance of both behaviors for friendship selection independent of sex-specific contexts, attenuating the implications of these gendered behaviors for peer relations.     

The scope and generality of self-other asymmetry. In person perception

The present study was designed to investigate systematically various explanations focusing on information bias, information-processing bias, self-determination, false-consensus bias, quest for positive regard, and self-presentation strategies, that have been suggested for the Jones—Nisbett (1971) proposition that people describe their own behaviour as relatively more influenced by situational factors as compared to the actions of others. To test the scope and generality of this self—other asymmetry, a new methodology was introduced. Using Stimulus-Response Inventories of Hostility and Friendliness, the effects of different degrees of familiarity with target persons, of positivity—negativity of behaviours, and of the public—private nature of the rating context, were studied. Generalizability coefficients were used as indices for a dispositional and a situationist view on personality. The results support only explanations in terms of information-processing bias and self-determination strivings. Implications of this finding for the conceptualization of self-judgments and other-judgments are discussed.     

Oral Health-Quality of Life Predictors Depend on Population

In the framework of the development and evaluation of oral health interventions that take into account people’s oral health-related quality of life (OH-QoL), it is important to know what determinants and effects of OH-QoL are. Because the processes involved in the experience of OH-QoL may differ for different populations, this study mapped the relations of general health perception, social factors, dental anxiety and oral hygiene behavior on the one hand with OH-QoL on the other hand, in two different samples that mainly differed on the experience they had with dental care and dental pathology: In 112 patients of the Center for Dentistry and Oral Hygiene and in 339 first year psychology students. The relations of three of the four variables with OH-QoL differed in both samples. Although not all relations could be interpreted unequivocally in this cross-sectional design, the data illustrate that the main difference between both samples (i.e., patients indicated for oral treatment versus students outside treatment) influenced the psychological processes involved in OH-QoL. This implicates that oral health interventions directed at increasing OH-QoL may have to be adapted to populations.     

Native language influences on word recognition in a second language: a megastudy

Many studies have reported that word recognition in a second language (L2) is affected by the native language (L1). However, little is known about the role of the specific language combination of the bilinguals. To investigate this issue, the authors administered a word identification task (progressive demasking) on 1,025 monosyllabic English (L2) words to native speakers of French, German, and Dutch. A regression approach was adopted, including a large number of within- and between-language variables as predictors. A substantial overlap of reaction time patterns was found across the groups of bilinguals, showing that word recognition results obtained for one group of bilinguals generalize to bilinguals with different mother tongues. Moreover, among the set of significant predictors, only one between-language variable was present (cognate status); all others reflected characteristics of the target language. Thus, although influences across languages exist, word recognition in L2 by proficient bilinguals is primarily determined by within-language factors, whereas cross-language effects appear to be limited. An additional comparison of the bilingual data with a native control group showed that there are subtle but significant differences between L1 and L2 processing.     

On the Non-Existence of Optimal Solutions and the Occurrence of “Degeneracy” in the CANDECOMP/PARAFAC Model

The CANDECOMP/PARAFAC (CP) model decomposes a three-way array into a prespecified number of R factors and a residual array by minimizing the sum of squares of the latter. It is well known that an optimal solution for CP need not exist. We show that if an optimal CP solution does not exist, then any sequence of CP factors monotonically decreasing the CP criterion value to its infimum will exhibit the features of a so-called “degeneracy”. That is, the parameter matrices become nearly rank deficient and the Euclidean norm of some factors tends to infinity. We also show that the CP criterion function does attain its infimum if one of the parameter matrices is constrained to be column-wise orthonormal.     

Aging and Situation Model Updating

The aim of this study was to investigate age differences in narrative comprehension and memory, with a focus on the updating of situation models during comprehension. While there are large effects of aging on memory for propositional textbase information, there is very little evidence that older adults have difficulty at the situation model level. Because described events are often dynamic, a comprehender must consistently update their situation model to make it consistent with the new information. The current experiments investigated whether there are any age differences associated with the ability to update a situation model along the spatial and temporal dimensions. Although updating effects were observed, they were largely not influenced by age. The relation of these findings to an understanding of older adults’ language comprehension and memory performance is discussed.     

Designing a Good Life: A Matrix for the Technological Mediation of Morality

Technologies fulfill a social role in the sense that they influence the moral actions of people, often in unintended and unforeseen ways. Scientists and engineers are already accepting much responsibility for the technological, economical and environmental aspects of their work. This article asks them to take an extra step, and now also consider the social role of their products. The aim is to enable engineers to take a prospective responsibility for the future social roles of their technologies by providing them with a matrix that helps to explore in advance how emerging technologies might plausibly affect the reasons behind people’s (moral) actions. On the horizontal axis of the matrix, we distinguished the three basic types of reasons that play a role in practical judgment: what is the case, what can be done and what should be done. On the vertical axis we distinguished the morally relevant classes of issues: stakeholders, consequences and the good life. To illustrate how this matrix may work in practice, the final section applies the matrix to the case of the Google PowerMeter.