Dopaminergic modulation of incentive motivation in adolescence: age-related changes in signaling, individual differences, and implications for the development of self-regulation

Behavioral activation that is associated with incentive-reward motivation increases in adolescence relative to childhood and adulthood. This quadratic developmental pattern is generally supported by behavioral and experimental neuroscience findings. It is suggested that a focus on changes in dopamine neurotransmission is informative in understanding the mechanism for this adolescent increase in reward-related behavioral activation and subsequent decline into adulthood. Evidence is presented to indicate that incentive-reward motivation is modulated by mesoaccumbens dopamine, and that it increases in adolescence before declining into adulthood because of normative developmental changes at the molecular level. Potential mechanisms of variation in functional mesoaccumbens dopamine transmission are discussed with a focus on the interplay between tonic and phasic modes of dopamine transmission in modulating both general incentive-motivational biases and the efficacy of reward learning during exposure to novel reward experiences. Interactions between individual difference factors and these age-related trends are discussed.     

The Appearance‐Change Instruction Does Not Improve Line‐up Identification Accuracy

In many jurisdictions, police instruct a witness, before presenting a photo line‐up, that the suspect's appearance may be different in the photo than it was at the time of the crime. The experiments reported here examine the impact of this ‘appearance‐change instruction’ (ACI), exploring its effects with different crimes, perpetrators, line‐ups, and different phrasings of the ACI. The data indicate that the ACI increases witnesses' willingness to make a choice from a line‐up but does not increase accuracy. Copyright © 2013 John Wiley & Sons, Ltd.     

Bi-Directional Relationship Between Self-Regulation and Improved Eating: Temporal Associations With Exercise,Reduced Fatigue,and Weight Loss

ABSTRACT. Severely obese men and women (body mass index ≥ 35 ≤ 55 kg/m²; M_age = 44.8 years, SD = 9.3) were randomly assigned to a 6-month physical activity support treatment paired with either nutrition education (n = 83) or cognitive-behavioral nutrition (n = 82) methods for weight loss. Both groups had significant improvements in physical activity, fatigue, self-regulation for eating, and fruit and vegetable intake. Compared to those in the nutrition education group, participants in the behavioral group demonstrated greater overall increases in fruit and vegetable intake and physical activity. These group differences were associated with changes that occurred after Month 3. Increased physical activity predicted reduced fatigue, β = ?.19, p =.01. A reciprocal relationship between the mediators of that relationship, which were changes in self-regulation and fruit and vegetable intake, was identified. There was significantly greater weight loss over six months in the behavioral nutrition group when contrasted with the nutrition education group. Self-regulation for eating and fruit and vegetable intake were significant predictors of weight loss over both three and six months. Findings enabled a better understanding of psychosocial effects on temporal aspects of weight loss and may lead to more effective behavioral treatments for weight loss.     

Are some video games associated with more life interference and psychopathology than others? Comparing massively multiplayer online role‐playing games with other forms of video game

Massively multiplayer online role‐playing games (MMORPGs) are a type of video game that is considered to have particular potential to be associated with life interference and psychopathology when played frequently and intensively. This study sought to compare players of MMORPGs with players of other types of video game in terms of problematic use, life interference, and levels of psychopathology. An international sample of 1,945 video game players completed a series of questionnaires online. While MMORPG players reported increased rates of problematic use and life interference compared with non‐MMORPG players, there were no differences in levels of psychopathology. Differences between MMORPG players and non‐MMORPG players appeared to be associated with the increased amounts of time that MMORPG players played for: The amount of time spent playing appeared to mediate the relationships between type of game played and each of the problematic use and life interference variables. The implications of these findings are discussed.     

The Spirit(s) of Science: Paradoxical Positivism as Religious Discourse among Spiritualists

This article examines a narrative dilemma that popular texts on evolution face. On the one hand, popular science tends to privilege linear and culturally familiar narrative structures, as previous studies of popularization have often emphasized. On the other hand, however, the Darwinian idea of natural selection resists linear narration, as narrative theorist H. Porter Abbott has argued. This resistance arises from the fact that evolution by natural selection lacks proper narrative entities and narrative events and that it relies on two parallel narrative levels, the levels of species and organism. This paper explores how two popular science books on evolution negotiate this narrative dilemma by introducing a third narrative level. Both texts appropriate characteristics from the narrative levels of species and organism and project them on molecular and minute scales by portraying evolution as a micro-narrative that takes place in chromosomes, genes, cells and microscopic details of human organs. While this textual strategy produces a coherent and compelling narrative that for the most part succeeds in masking the structural gap between the narrative levels of species and organism, it also risks naturalizing cultural imagery. In particular, this micro-narrative tends to represent popular gender ideologies as biological truths embedded in molecular processes within our bodies.     

Dispositions of the Will

According to Aquinas (1888–1906), the virtue of justice is a habit, that is to say, a stable disposition of the will. Many commentators have found this claim to be puzzling, since it is difficult to see what this might entail, beyond a simple tendency to choose and act in accordance with precepts of justice. However, this objection does not take account of the fact that for Aquinas, the will is the principle of human freedom, and as such, it is expressed through, but not limited to a capacity for particular choices and actions. It therefore needs stable dispositions, towards characteristic aims, in order to function effectively. This paper sets out a case for the cogency of Aquinas’s overall account of the will and its dispositions, by way of an examination of familiar expressions of human freedom which cannot be reduced to a series of individual choices and acts. It then turns to a closer examination of Aquinas’ analysis of the will, arguing that Aquinas’ claims about the orientation of the will towards some overarching and comprehensive good can fruitfully be understood in terms of this expansive conception of human freedom.     

Associations between cortical thickness and general intelligence in children,adolescents and young adults

Neuroimaging research indicates that human intellectual ability is related to brain structure including the thickness of the cerebral cortex. Most studies indicate that general intelligence is positively associated with cortical thickness in areas of association cortex distributed throughout both brain hemispheres. In this study, we performed a cortical thickness mapping analysis on data from 182 healthy typically developing males and females ages 9 to 24 years to identify correlates of general intelligence (g) scores. To determine if these correlates also mediate associations of specific cognitive abilities with cortical thickness, we regressed specific cognitive test scores on g scores and analyzed the residuals with respect to cortical thickness. The effect of age on the association between cortical thickness and intelligence was examined. We found a widely distributed pattern of positive associations between cortical thickness and g scores, as derived from the first unrotated principal factor of a factor analysis of Wechsler Abbreviated Scale of Intelligence (WASI) subtest scores. After WASI specific cognitive subtest scores were regressed on g factor scores, the residual score variances did not correlate significantly with cortical thickness in the full sample with age covaried. When participants were grouped at the age median, significant positive associations of cortical thickness were obtained in the older group for g-residualized scores on Block Design (a measure of visual-motor integrative processing) while significant negative associations of cortical thickness were observed in the younger group for g-residualized Vocabulary scores. These results regarding correlates of general intelligence are concordant with the existing literature, while the findings from younger versus older subgroups have implications for future research on brain structural correlates of specific cognitive abilities, as well as the cognitive domain specificity of behavioral performance correlates of normative gray matter thinning during adolescence.     

Exemplification and Constituent Realism: A Clarification and Modest Defense

In this article I present and (modestly) defend a hybrid position which we may call a Platonist constituent ontology. More specifically, I present a version of exemplification which entails (1) a certain form of Platonism, (2) a constituent ontology of ordinary objects, (3) a view of exemplification as a “tiedto” nexus, and (4) a view of properties as abstract objects that are non-spatially “in” ordinary objects. I clarify two sets of preliminary issues, present my hybrid analysis of exemplification, raise and seek to undercut an argument against my constituent realism, and surface some of the costs and benefits relevant to assessing the relative merits of relational versus constituent realism.     

Modulation sensitivity in the perceptual organization of speech

In a spoken utterance, a talker expresses linguistic constituents in serial order. A listener resolves these linguistic properties in the rapidly fading auditory sample. Classic measures agree that auditory integration occurs at a fine temporal grain. In contrast, recent studies have proposed that sensory integration of speech occurs at a coarser grain, approximate to the syllable, on the basis of indirect and relatively insensitive perceptual measures. Evidence from cognitive neuroscience and behavioral primatology has also been adduced to support the claim of sensory integration at the pace of syllables. In the present investigation, we used direct performance measures of integration, applying an acoustic technique to isolate the contribution of short-term acoustic properties to the assay of modulation sensitivity. In corroborating the classic finding of a fine temporal grain of integration, these functional measures can inform theory and speculation in accounts of speech perception.