Further evidence for addition and numerical competence by a Grey parrot (Psittacus erithacus)

A Grey parrot (Psittacus erithacus), able to quantify sets of eight or fewer items (including heterogeneous subsets), to sum two sequentially presented sets of 0–6 items (up to 6), and to identify and serially order Arabic numerals (1–8), all by using English labels (Pepperberg in J Comp Psychol 108:36–44, 1994; J Comp Psychol 120:1–11, 2006a; J Comp Psychol 120:205–216, 2006b; Pepperberg and Carey submitted), was tested on addition of two Arabic numerals or three sequentially presented collections (e.g., of variously sized jelly beans or nuts). He was, without explicit training and in the absence of the previously viewed addends, asked, “How many total?” and required to answer with a vocal English number label. In a few trials on the Arabic numeral addition, he was also shown variously colored Arabic numerals while the addends were hidden and asked “What color number (is the) total?” Although his death precluded testing on all possible arrays, his accuracy was statistically significant and suggested addition abilities comparable with those of nonhuman primates.     

Validation of a Spanish version of the Muscle Appearance Satisfaction Scale: Escala de Satisfacción Muscular

The psychometric properties of a Spanish version of the Muscle Appearance Satisfaction Scale (MASS; Mayville, Williamson, White, Netemeyer, & Drab, 2002) were examined using a sample of five hundred and sixty-one male weightlifters. Exploratory and confirmatory factor analyses suggested that the 19-item Spanish version of the MASS called the Escala de Satisfacción Muscular (ESM), was represented by five subscales similar to the original MASS. Internal consistency of the measure was good (α=.86-.95), and various measures of construct validity indicated that the ESM may be a useful measure of Muscle Dysmorphia symptoms among Spanish speaking populations.     

Is a change in work motivation related to a change in mental well-being?

The purpose of the study was to investigate the effect of changes on work motivation and the effect of the changes on future mental well-being. This prospective study comprised 577 employees who were followed up 18 months after a comprehensive baseline measurement. The response rate was 81% for the baseline and 72% for the follow-up. The results show that both negative and positive changes in work motivation over time (18 months) were related to exhaustion. A similar correlation was found between negative changes in work motivation and depression. The results show that employees with a decreased level of work motivation had a higher risk of experiencing more exhaustion and depression in the future. Thus, investing in activities to promote work motivation may be an effective means of preventing long-term sick leave for stress-related mental illness and of providing energy for successful career advancement.     

The early development of human mirror mechanisms: evidence from electromyographic recordings at 3 and 6 months

In primates and adult humans direct understanding of others' action is provided by mirror mechanisms matching action observation and action execution (e.g. Casile, Caggiano & Ferrari, 2011). Despite the growing body of evidence detailing the existence of these mechanisms in the adult human brain, their origins and early development are largely unknown. In this study, for the first time, electromyographic (EMG) measures were used to shed light on the emergence of mirror motor mechanisms in infancy. EMG activity was recorded while 6‐ and 3‐month‐old infants watched two videos displaying an agent reaching for, grasping and bringing an object either to the mouth or to the head. Results indicate that the motor system of 6‐month‐olds, but not 3‐month‐olds, was recruited and selectively modulated during observation of the goal‐directed actions, favoring the idea that mirror mechanisms driving action understanding gradually emerge during early development.     

Love Life: Aristotle on Living Together with Friends

According to Aristotle, the most characteristic activity of friendship is “living together” [to suzên]. This paper seeks to understand living together in the light of his famous, foundational claim that humans are social by nature. Based on an interpretation of Nicomachean Ethics 9.9, I explain our need for friends in terms of a more fundamental human need to appreciate one's life as a whole. I then argue that friendship is built into the very structure of human life itself such that human living is living together.     

Feeling Controlled and Drinking Motives Among College Students: Contingent Self-Esteem as a Mediator

This article presents an examination of college student drinking motives from a self-determination perspective. We predicted positive associations between controlled orientation (a chronic orientation toward pressures and experiencing a lack of choice in one's behaviors), and drinking as a means of regulating affect (enhancement and coping motives) and social approval (social rewards and conformity motives). Contingent self-esteem involves deriving self-worth from meeting expectations and was expected to mediate the relation between controlled orientation and drinking motives, which were in turn expected to predict alcohol consumption and related consequences. College students' (N?=?204) controlled orientation, contingent self-esteem, motives for drinking, and patterns of alcohol use were assessed. Mediation analyses provided support for our theoretical framework. Results suggest that “controlled” individuals drink to regulate affect and social approval in part because they have a greater tendency to base self-worth on contingencies.     

Social Skills Mediate the Association of ADHD and Depression in Preadolescents

Childhood attention-deficit/hyperactivity disorder (ADHD) is a replicated risk factor for depression, but the explanatory factors underlying this association have not been reliably identified. Given that social skills (i.e., cooperation, assertion, responsibility, self-control) are sensitive to early ADHD and predict later depression, we tested whether individual differences in social skills individually and collectively mediated predictions of depressive symptoms from early ADHD symptoms. In an ethnically diverse (50 % non-Caucasian) sample of 232 children with (n = 124) and without ADHD (n = 108) followed prospectively for two years (aged 5–10 at Wave 1; 7–12 at Wave 2), we gathered multi-informant (i.e., parent, teacher) and multi-method (e.g., rating scale, structured interview) assessment of key constructs. Using a multiple mediation framework with bootstrapping and statistical control of sex, Wave 1 depression, Wave 1 oppositional defiant disorder (ODD), Wave 1 anxiety, and Wave 2 ADHD symptoms, an independent mediation effect emerged for parent-rated self-control in the prediction of Wave 2 depression (parent-rated) from Wave 1 ADHD symptoms (combined parent and teacher ratings). Teacher-rated social skills at Wave 1 also collectively mediated this association, with teacher-rated assertion emerging as a unique mediator. We discuss the role of social skills in emergent depression among youth with ADHD and consider implications for prevention and intervention.     

A review of abnormalities in the perception of visual illusions in schizophrenia

Specific abnormalities of vision in schizophrenia have been observed to affect high-level and some low-level integration mechanisms, suggesting that people with schizophrenia may experience anomalies across different stages in the visual system affecting either early or late processing or both. Here, we review the research into visual illusion perception in schizophrenia and the issues which previous research has faced. One general finding that emerged from the literature is that those with schizophrenia are mostly immune to the effects of high-level illusory displays, but this effect is not consistent across all low-level illusions. The present review suggests that this resistance is due to the weakening of top–down perceptual mechanisms and may be relevant to the understanding of symptoms of visual distortion rather than hallucinations as previously thought.