Bilingualism Is Associated with a Delayed Onset of Dementia but Not with a Lower Risk of Developing it: a Systematic Review with Meta-Analyses

Neuropsychology Review - Some studies have linked bilingualism with a later onset of dementia, Alzheimer’s disease (AD), and mild cognitive impairment (MCI). Not all studies have observed...     

Exploring the Complexities of Familism and Acculturation: Central Constructs for People of Mexican Origin

We examined the relationships between three dimensions of familism: importance of family, family support, and family conflict with acculturation, assessed orthogonally (Mexican and American cultural contributions assessed independently), and the relative contribution these factors make to psychological adjustment among 248 (124 women, 124 men) adults of Mexican origin. After controlling for sociodemographic characteristics, positive associations were found between importance of family and the biculturalism of Mexican and American cultural identity; family support and Mexican cultural identity; but no associations between family conflict and level of acculturation. Psychological well-being was positively associated with Mexican cultural identity and family support, whereas psychological distress was associated with greater family conflict and lower family support. The greater relative contribution of Mexican cultural identity to familism and well-being, and the importance of assessing acculturation orthogonally are discussed. This research was supported in part by a Minority Supplement to National Institute of Mental Health Grant MH47193 to the Research Center on the Psychobiology of Ethnicity, Harbor-UCLA Medical Center and by a research award from Pitzer College to Norma Rodriguez.     

The moment‐to‐moment pitch dynamics of child‐directed speech shape toddlers’ attention and learning

Young children have an overall preference for child‐directed speech (CDS) over adult‐directed speech (ADS), and its structural features are thought to facilitate language learning. Many studies have supported these findings, but less is known about processing of CDS at short, sub‐second timescales. How do the moment‐to‐moment dynamics of CDS influence young children's attention and learning? In Study 1, we used hierarchical clustering to characterize patterns of pitch variability in a natural CDS corpus, which uncovered four main word‐level contour shapes: ‘fall’, ‘rise’, ‘hill’, and ‘valley’. In Study 2, we adapted a measure from adult attention research—pupil size synchrony—to quantify real‐time attention to speech across participants, and found that toddlers showed higher synchrony to the dynamics of CDS than to ADS. Importantly, there were consistent differences in toddlers’ attention when listening to the four word‐level contour types. In Study 3, we found that pupil size synchrony during exposure to novel words predicted toddlers’ learning at test. This suggests that the dynamics of pitch in CDS not only shape toddlers’ attention but guide their learning of new words. By revealing a physiological response to the real‐time dynamics of CDS, this investigation yields a new sub‐second framework for understanding young children's engagement with one of the most important signals in their environment.     

The speed of visual recognition memory

Two processes are thought to support visual recognition memory (VRM): Familiarity and recollection. The former is generally considered to be faster. However, the relationship between the precise onset of the two processes is unclear. Here, we use a novel paradigm, the SAB (Speed and Accuracy Boosting procedure) that constrains participants to use their fastest strategy and provides a continuous distribution of their reaction times. We show that fast recognition occurs as early as ~370 ms, a limit that appears incompressible whatever types of stimuli were used. In a second experiment, running the SAB in conjunction with a modified version of the remember/know paradigm, we show that responses up to ~420 ms are based solely on familiarity. These time limits of 370 ms and 420 ms provide strong constraints on the neural mechanisms underlying VRM and suggest that the fastest, familiarity-based, responses could rely on the visual ventral stream only.     

Mass Media as Alcohol Educator for Everyone? Effects of Portrayed Alcohol Consequences and the Influence of Viewers’ Characteristics

ABSTRACT

Many correlative and experimental studies indicate that the portrayal of alcohol in the mass media impacts viewers’ alcohol expectancies, attitudes, and behaviors. Based on social cognitive theory, the portrayed consequences and the valence of the character experiencing these consequences are important to consider when investigating the portrayal of alcohol in the mass media. However, experimental studies manipulating character valence and consequences are scarce. This study presents an experimental examination of an adult sample, manipulating the occurrence of consequences (no consequences, positive consequences, and negative consequences), as well as character valence (a positive or negative character). We investigated the effects of media portrayals on positive and negative alcohol expectancies, as well as on attitudes toward alcohol. Furthermore, the moderating role of participants’ level of alcohol consumption was considered. We found main effects only on the negative alcohol expectancies, supporting the differentiation of alcohol expectancies and attitudes. However, the valence of the depicted character did not moderate the impact of the portrayed consequences. Interaction effects of participants’ individual levels of alcohol consumption and portrayals of consequences of alcohol consumption in the mass media were uncovered. This finding has important implications for further research and prevention efforts directed at risk groups.     

Phonological codes are early sources of constraint in visual semantic categorization

Two experiments were directed at early phonological activation in the semantic categorization task. In Experiment 1, briefly exposed targets homophonic to category exemplars (rows for the categorya flower), and their graphemic controls (robs), were judged for category membership with and without a backward pattern mask False positives were greater for rows than robs to the same degree under both unmasked and masked conditions. In Experiment 2, false positives were examined in the semantic categorization task under backward dichoptic masking by pseudowords that were, in turn, masked monoptically by a pattern mask. Briefly exposed homophones (e.g.,weak), masked by a phonologically similar pseudoword (“feek”), a graphemic control (“felk”), or an unrelated pseudoword (“furt”), were categorized as category exemplars (a unit of time). The difference in false positives was significant forweak-feek versusweak-furt, but not forweak-felk versusweak-furt. It was suggested that the persistence of the homophonic effects under the pattern masking of Experiment 1 and their amplification under the phonological masking of Experiment 2 were because phonological codes cohere rapidly and provide, thereby, immediately available constraints on semantic processing.     

Sociocultural pressures and adolescent eating in the absence of hunger

Parental feeding practices and sociocultural pressures theoretically influence eating behavior. Yet, whether these factors relate to eating in the absence of hunger (EAH) is unknown. We assessed if sociocultural pressures were associated with EAH among 90 adolescents (M_age = 15.27, SD = 1.39; 48% female). Parents completed the Child Feeding Questionnaire. Adolescents completed the Perceived Sociocultural Pressures Scale, Sociocultural Attitudes Towards Appearance Questionnaire-3, and Multidimensional Body Self-Relations Questionnaire-Appearance Scales. On two occasions, EAH was assessed as snack food intake after adolescents ate to satiety. Controlling for body composition and demographics, parental restriction and family pressure to be thin were associated with greater EAH. Media pressure was related to more EAH in girls. Appearance orientation and preoccupation with becoming overweight mediated links between sociocultural pressures and EAH. Findings support the notion that sociocultural pressures and their links to body image may contribute to the course of disinhibited eating behaviors during adolescence.