The Small Worlds and Floyd's algorithms: a way to study scientific collaboration

Many proposals from the analysis of social networks focused on the study of scientific collaboration have been made recently. The Small Worlds theory seems to be the most efficient to study the inner features of the scientific community. Those researches have demonstrated that small communities are based on some key individuals who connect some groups which, on the contrary, would be disconnected. One of the disadvantages from the perspective of the analysis of networks is the lack of researches of particular nodes. With the implementation of a pseudocode algorithm of Floyd, we try to avoid this. To study how a small community is formed and, as a research of one case, we observe the invisible college which is formed when connecting the fifteen most productive authors of the Journal of Personality and Social Psychology .     

Transthyretin influences spatial reference memory

Transthyretin (TTR) is a plasma and cerebrospinal fluid carrier for thyroxine and retinol, described also to sequester the amyloid beta peptide. TTR levels have been described as decreased in the cerebrospinal fluid of patients with Alzheimer's disease. In order to investigate the role of TTR in learning and memory, we studied young adult and old TTR-null 129/Sv mice for cognitive performance. In the absence of TTR, 5-month-old mice display spatial reference memory impairment when compared to age-matched wild-type mice. Interestingly, while aging in wild-type mice is associated with a worsening reference memory performance, TTR-null mice show no further impairment with increasing age. As a result, no significant differences were found in this spatial reference task in old mice. Our data show that the absence of TTR seems to accelerate the poorer cognitive performance normally associated with aging.     

First came the trees, then the forest: developmental changes during childhood in the processing of visual local-global patterns according to the meaningfulness of the stimuli

This study investigated how global and local perceptual processes evolve during childhood according to the meaningfulness of the stimuli. Children had to decide whether visually presented pairs of items were identical or not. Items consisted of global forms made up of local forms. Both global and local forms could represent either objects or nonobjects. In dissimilar pairs, items differed at one level (target level), while the other level included similar forms on both sides (irrelevant level). The results indicate an evolution from local preference at 4 years of age to adult-like global preference at 9 years of age. Moreover, as previously reported in adults, regardless of age, identification impaired performance when the irrelevant level was made of objects and the target level was made of nonobjects (interference). However, in younger children, this interference existed even when objects were present at all levels, suggesting that the strategy used to perform the comparison task also varied according to age.     

Priming effects on the N400 in the affective priming paradigm with facial expressions of emotion

We studied the effect of facial expression primes on the evaluation of target words through a variant of the affective priming paradigm. In order to make the affective valence of the faces irrelevant to the task, the participants were assigned a double prime–target task in which they were unpredictably asked either to identify the gender of the face or to evaluate whether the word was pleasant or unpleasant. Behavioral and electrophysiological (event-related potential, or ERP) indices of affective priming were analyzed. Temporal and spatial versions of principal components analyses were used to detect and quantify those ERP components associated with affective priming. Although no significant behavioral priming was observed, electrophysiological indices showed a reverse priming effect, in the sense that the amplitude of the N400 was higher in response to congruent than to incongruent negative words. Moreover, a late positive potential (LPP), peaking around 700 ms, was sensitive to affective valence but not to prime–target congruency. This pattern of results is consistent with previous accounts of ERP effects in the affective priming paradigm that have linked the LPP with evaluative priming and the N400 with semantic priming. Our proposed explanation of the N400 priming effects obtained in the present study is based on two assumptions: a double check of affective stimuli in terms of valence and specific emotion content, and the differential specificities of facial expressions of positive and negative emotions.     

Application of stochastic modeling to the assessment of group and individual differences in cognitive functioning

This article begins with a guiding schema of relations among cognitive science, clinical science, and assessment technology. Emphasis is placed on stochastic modeling of cognitive processes. Basic models are adjusted so as to parsimoniously accommodate performance deviations occurring with psychopathology. Modified portions of models indicate functions affected by disorder, whereas portions remaining intact indicate spared functions. Findings from clinical cognitive science are applied to the individual case using Bayesian procedures. Methods are instantiated with respect to cognitive psychopathology of paranoid schizophrenia. The authors address observations and issues arising from this application, including integration of these methods with current assessment practices.     

Amygdala oscillations and the consolidation of emotional memories

The amygdala receives multi-modal sensory inputs and projects to virtually all levels of the central nervous system. Via these widespread projections, the amygdala facilitates consolidation of emotionally arousing memories. How the amygdala promotes synaptic plasticity elsewhere in the brain remains unknown, however. Recent work indicates that amygdala neurons show theta activity during emotional arousal, and various types of oscillations during sleep. These synchronized neuronal events could promote synaptic plasticity by facilitating interactions between neocortical storage sites and temporal lobe structures involved in declarative memory.     

Procesos de aprendizaje y terapia de conducta en la adicción a la heroína

Resumen

Múltiples principios de condicionamiento clásico y operante interaccionan en la adición a la heroína. Destacan la presencia de RC Compensatorias en forma de Síndrome de Abstinencia Condicionado (SAC) y distintos programas de reforzamiento en el estilo de vida, argot y efectos de la heroína. En evaluación conductual se estudian los correlatos subjetivos y psicofisiológicos del SAC; la validez externa de los autorregistros se logra mediante análisis de orina. En terapia de conducta los programas de amplio espectro se combinan con la intervención comunitaria y apoyo médico. A nivel metodológico se resalta la necesidad de usar múltiples criterios de medición, introducción del análisis multivariado y uso de diseños estadísticos, realización de seguimientos a largo plazo.     

Using the Implicit Association Test to Assess Risk Propensity Self‐concept: Analysis of its Predictive Validity on a Risk‐taking Behaviour in a Natural Setting

The present work analyses the predictive validity of measures provided by several available self‐report and indirect measurement instruments to assess risk propensity (RP) and proposes a measurement instrument using the Implicit Association Test: the IAT of Risk Propensity Self‐Concept (IAT‐RPSC), an adaptation of the prior IAT‐RP of Dislich et al. Study 1 analysed the relationship between IAT‐RPSC scores and several RP self‐report measures. Participants' risk‐taking behaviour in a natural setting was also assessed, analyzing the predictive validity of the IAT‐RPSC scores on risk‐taking behaviour compared with the self‐report measures. Study 2 analysed the predictive validity of the IAT‐RPSC scores in comparison with other indirect measures. Results of these studies showed that the IAT‐RPSC scores exhibited good reliability and were positively correlated to several self‐report and indirect measures, providing evidence for convergent validity. Most importantly, the IAT‐RPSC scores predicted risk‐taking behaviour in a natural setting with real consequences above and beyond all other self‐report and indirect measures analysed. Copyright © 2013 European Association of Personality Psychology     

Age differences in feeling-of-knowing and confidence judgements as a function of knowledge domain

For two semantic knowledge domains, general and computer-related, feeling-of-knowing (FOK) and confidence level (CL) ratings and their relative accuracy were assessed in young, middle-aged, and older adults, after test difficulty was equated across age groups. Global memory self-efficacy beliefs were also assessed for each domain. As expected, greater age was associated with poorer memory self-efficacy beliefs only in the computer domain. The oldest two groups were found to be more underconfident than young adults when rating their FOK but not their CL, for computer items but not for general items. Statistical control of age differences in memory self-efficacy beliefs in the relevant domain greatly reduced this age effect on computer-related FOK ratings. This finding suggests that absolute FOK judgments are more closely related to memory self-efficacy beliefs than are CL judgments. Gamma correlations between judgments and recognition performance revealed that all age groups were equally accurate in FOK and in CL judgments, in both domains.     

Towards the concerned study of religion: Exploring the double power–play disparity

Increasing numbers of students of religion, from various disciplines, address issues of public interest, going beyond documentation and analysis, taking the quality of human life in religion and society as a criterion for their recommendations. Accordingly, systematic reflection on the concerned study of religion is gaining relevance. The approach chosen in this article is to focus on one particular aspect, in this case the double ‐ cognitive and moral ‐ disparity in religious contexts between forms of power and play.

Power is viewed as the human capacity to influence other people's behaviour, even against their will. Play is defined here as the human capacity to deal simultaneously with different realities. Power and play represent two human capacities that in themselves are neutral but in combination may change from means, a situation of parity, into goal, a situation of disparity. A first type of disparity is cognitive in nature. It stems from the reduction of the potential open dynamic meaning-making that the power‐play constellation could stimulate as well. A second disparity is of a moral nature. It stems from the fact that the power‐play set may come to interfere with the quality of human life. As a set, power and play thus move between the roles of being either subservient means or self-fulfilling goal, between a soft and a hard version.

Religion is one field in which the gift for play is applied, resulting in the relationship with a sacred or divine reality. Whereas religions cannot survive without some form of power, the form given to the power‐play set marks out a religion's identity. Within our time the critical study of the double disparity of hard power and play has gained urgency. Global society faces severe problems of poverty, violence, pollution and miscommunication. Religions may act as a cause, but also as problem solver. Students of religion are invited to form multidisciplinary teams to study the double disparity in its actual form, while simultaneously exploring prospects for the promotion of both open meaning-making and the quality of human life, with power and play in a relationship of parity. This turn would necessitate a reappraisal of the research agenda for Religious/World-view Studies. It demands an identity change for this study field, both in the selection of themes for research and funding, and in the explicitly applied nature of scholarly work.