Effects of processing bias on the recognition of composite face halves

Research has shown that face recognition accuracy can be improved by prior global processing and impaired by prior local processing (Macrae & Lewis, 2002). The aim of this study was to test the processing bias account of face recognition, using the composite face task (Young, Hellawell, & Hay, 1987), a test of featural recognition. Undergraduate volunteers (N=75) participated in a between-subjects design that tested their ability to recognize face halves within a composite, following either global or local Navon processing or a control task. Results showed that, as compared with the control task, local processing speeded ability to recognize face halves. These results provide support for the processing bias account of face recognition.     

Endocrinology of menopausal transition and its brain implications

The central nervous system is one of the main target tissues for sex steroid hormones, which act on both through genomic mechanisms, modulating synthesis, release, and metabolism of many neuropeptides and neurotransmitters, and through non-genomic mechanisms, influencing electrical excitability, synaptic function, morphological features, and neuron-glia interactions. During the climacteric period, sex steroid deficiency causes many neuroendocrine changes. At the hypothalamic level, estrogen withdrawal gives rise to vasomotor symptoms, to eating behavior disorders, and altered blood pressure control. On the other hand, at the limbic level, the changes in serotoninergic, noradrenergic, and opioidergic tones contribute to the modifications in mood, behavior, and nociception. Hormone replacement therapy (HRT) positively affects climateric depression throughout a direct effect on neural activity and on the modulation of adrenergic and serotoninergic tones and may modulate the decrease in cognitive efficiency observed in climaterium. The identification of the brain as a de novo source of neurosteroids, suggests that the modifications in mood and cognitive performances occurring in postmenopausal women may also be related to a change in the levels of neurosteroids. These findings open new perspectives in the study of the effects of sex steroids on the central nervous system and on the possible use of alternative and/or auxiliary HRT.     

PEER MODELING OF RESPONSE CHAINS: OBSERVATIONAL LEARNING BY STUDENTS WITH DISABILITIES

Peer models (classmates without disabilities) who were proficient in performing a task completed one response chain each day and described the steps they performed while their classmates with disabilities observed. Three students with disabilities participated, and their performance of the response chains was assessed immediately prior to and following the peer modeling each day. A multiple probe design across response chains, replicated across children with disabilities, was used. In addition, participation and social interactions of children with disabilities and their peer models were assessed in classroom activities after daily modeling sessions. The results indicate that the peer models performed the response chains accurately and quickly, and students with disabilities acquired the response chains. Across the study, participation in classroom activities was high, social interactions were low, and neither was affected by the peer modeling intervention.     

CULTURE AND COGNITIVE PROBLEMS

Culture et problèms cognitifs. — L'A. étudie les effets du niveau culturel et des processus d'acculturation sur deux aspects du fonctionnement cognitif: L'exploration d'une configuration perceptive et L'élaboration des informations. Pour rendre compte du premier, ont été retenus les résultats d'une recherche faite sur des populations primitives de L'Amazonie soumises au test de Roschach: L'augmentation du pourcentage des réponses Dd., chez les sujets “acculturés” par rapport à ceux qui ne le sont pas, indique qu'il y a passage d'une phase de réponses globales et stéréotypées à une phase d'analyse détaillée bien qu'encore primitive. En second lieu, L'élaboration des informations drées de L'exploration d'une configuration perceptive a été étudiée relativement aux points suivants: causalité physique, notions de conservation, intégration de variables antagonistes et opération de combinaison. Les résultats montrent qu'un milieu socio-culturel sous-développé ou un niveau d'instruction nul ou insuffisant, ou encore un milieu de travail peu “acculturé” peuvent faire obstacle au développement d'un processus de pensée apte á considérer plusieurs variables, même antagonistes, à la fois, et à les intégrer dans une fonction unique, par un réseau de relations multiplicatives. En général, la seule maturation biologique ne permet pas d'atteindre complètement ce type de pensée. Le raisonnement des sujets adultes qui viennent d'un milieu sous-développé fluctue entre schème notionnel et schème figuratif; il se rapproche de L'un ou de L'autre selon le degré de pression qu'exercent les éléments perceptifs. C'est pourquoi on évoque ici L'utilité, limitée a la résolution d'un problème, que pourrait avoir le fait de dormer aux sujets des instruments mécaniques de “servo-pensée”. Les résultats de ces études semblent enfin montrer que certains retards dans le développement intellectuel peuvent être rattrapés lorsqu'on place les sujets dans un milieu plus favorable.     

The role of transmission biases in the cultural diffusion of irrelevant actions

This study used a diffusion chain paradigm to explore the cultural transmission of causally irrelevant tool actions in chains of adult participants. Each chain witnessed an "expert" adult retrieve a reward from inside a puzzle box using a combination of causally relevant actions and causally irrelevant actions. Which of the actions were causally relevant was evident in two of the chains where a transparent box was used. In the other two chains, the causal effectiveness of the tool was hidden inside an opaque version of the box. Results indicated that fewer of the irrelevant actions performed by the expert model were reproduced in the transparent box chains, than the opaque box chains. However, irrelevant actions, although not in their original form, were evident within each chain suggesting that causally irrelevant tool actions can survive within groups of adults. The current article places these results, alongside those from earlier overimitation studies, within a framework of cultural evolution. The proposal here is that the social learning of irrelevant actions is heavily influenced by the interaction between various transmission biases, including frequency-based biases, model-based biases, and content-based biases. It is further proposed that the transmission bias witnessed may differ according to the interplay between characteristics of the model, characteristics of the observer, and the contents of the task.     

Objects, events and "to be" verbs in Spanish--an ERP study of the syntax-semantics interface

In Spanish, objects and events at subject position constrain the selection of different forms of the auxiliary verb “to be”: locative predicates about objects require “estar en”, while those relating to events require “ser en”, both translatable as “to be in”. Subjective ratings showed that while the “object + ser + en” is considered as incorrect, the “event + estar + en” combination is also perceived as unacceptable but to a lesser degree. In an ERP study, we evaluated the impact of a purely semantic distinction (object versus events) on the subsequent processing of these auxiliary verbs followed by locatives in Spanish. For the “ser en” predicate, the P600 component was larger when the subject was an object than when it was an event. This P600 effect is consistent with an online repair of the defining predicate when it does not fit with the adequate semantic properties of the subject. On the other hand, for the “estar en” predicate, event subjects when compared to object subjects showed more positive ongoing amplitudes between 280 and 380 ms after the presentation of the “en” preposition, followed by a longer positive wave starting around 400 ms and lasting until 700 ms after the presentation of the following determiner, with central and frontal scalp distributions respectively. Thus, the different subject-predicate combinations, depending on the semantic features of the subjects, triggered syntactic reparatory processes at a structural level. These findings are consistent with an incremental interpretation of sentence meaning based on the interaction between syntactic and semantic information.     

Character Strengths Interventions: Building on What We Know for Improved Outcomes

For this review strengths intervention studies were located using online searches and collegial networks and included if they explicitly sought to teach or use a strengths classification to enhance well-being, and used pre- and post-intervention measures and a comparison group. Eight studies met the criteria and have been summarised by this review. To date, the effect sizes achieved by character strengths interventions have been small to moderate. An understanding of how these interventions work may facilitate development of more effective interventions, while expanding the field of character strengths interventions to include a broader range of activities and approaches may also offer benefits. Research examining individual factors, such as strengths use, psychological need satisfaction, goal-setting and goal-striving provides promising leads to explain how strengths interventions work. However, the effect on intervention efficacy of relational or contextual factors, such as intervention environment or facilitator attitude to strengths, has not yet been explored. Implications for interventions in school settings are considered.     

Impairment in material-specific long-term memory following unilateral mediodorsal thalamic damage and presumed partial disconnection of the mammillo-thalamic tract

Neuropsychological findings suggest material-specific lateralization of the medial temporal lobe's role in long-term memory, with greater left-sided involvement in verbal memory, and greater right-sided involvement in visual memory. Whether material-specific lateralization of long-term memory also extends to the anteromedial thalamus remains uncertain. We report two patients with unilateral right (OG) and left (SM) mediodorsal thalamic pathology plus probable correspondingly lateralized damage of the mammillo-thalamic tract. The lesions were mapped using high-resolution structural magnetic resonance imaging and schematically reconstructed. Mean absolute volume estimates for the mammillary bodies, hippocampus, perirhinal cortex, and ventricles are also presented. Estimates of visual and verbal recall and item recognition memory were obtained using the Doors and People, the Rey Complex Figure Test, and the Logical Memory subtests of the Wechsler Memory Scales. Each patient's performance was compared to a group of healthy volunteers matched for demographic characteristics, premorbid IQ, and current levels of functioning. A striking double dissociation was evident in material-specific long-term memory, with OG showing significant impairments in visual memory but not verbal memory, and SM showing the opposite profile of preserved visual memory and significantly impaired verbal memory. These impairments affected both recall and item recognition. The reported double dissociation provides the strongest evidence yet that material-specific lateralization of long-term memory also extends to the anteromedial thalamus. The findings are also discussed in relation to proposals that distinct anatomical regions within the medial temporal lobe, anteromedial thalamus, and associated tracts make qualitatively different contributions to recall and item recognition.