Causal perception of action-and-reaction sequences in 8- to 10-month-olds

Four experiments with 202 8- to 10-month-old infants studied their sensitivity to causation-at-a-distance in schematic events seen as goal-directed action and reaction by adults and whether this depends on attributes associated with animate agents. In Experiment 1, a red square moved toward a blue square without making contact; in “reaction” events blue moved away while red was approaching, whereas in “delay” events blue started after red stopped. Infants were habituated to one event and then tested on its reversal. Spatiotemporal features reversed for both events, but causal roles changed only in reversed reactions. Infants dishabituated more to reversed reaction events than to reversed delay events. Squares moved rigidly or in a nonrigid animal-like fashion. Infants discriminated these, but motion pattern did not affect responses to reversal. Infants also discriminated reactions from launching and dishabituated to reversed reactions lacking self-initiated motion. These results suggest that sensitivity to causation-at-a-distance depends on the event structure but not pattern or onset typical of animal motion.     

Recovering a Probabilistic Knowledge Structure by Constraining its Parameter Space

In the Basic Local Independence Model (BLIM) of Doignon and Falmagne (Knowledge Spaces, Springer, Berlin, 1999), the probabilistic relationship between the latent knowledge states and the observable response patterns is established by the introduction of a pair of parameters for each of the problems: a lucky guess probability and a careless error probability. In estimating the parameters of the BLIM with an empirical data set, it is desirable that such probabilities remain reasonably small. A special case of the BLIM is proposed where the parameter space of such probabilities is constrained. A simulation study shows that the constrained BLIM is more effective than the unconstrained one, in recovering a probabilistic knowledge structure.     

Small-sample characterization of stochastic approximation staircases in forced-choice adaptive threshold estimation

Despite the widespread use of up-down staircases in adaptive threshold estimation, their efficiency and usability in forced-choice experiments has been recently debated. In this study, simulation techniques were used to determine the small-sample convergence properties of stochastic approximation (SA) staircases as a function of several experimental parameters. We found that satisfying some general requirements (use of the accelerated SA algorithm, clear suprathreshold initial stimulus intensity, large initial step size) the convergence was accurate independently of the spread of the underlying psychometric function. SA staircases were also reliable for targeting percent-correct levels far from the midpoint of the psychometric function and performed better than classical up-down staircases with fixed step size. These results prompt the utilization of SA staircases in practical forced-choice estimation of sensory thresholds.     

The role of ingroup threat and conservative ideologies on prejudice against immigrants in two samples of Italian adults

This research investigated the relationship among perception of ingroup threats (realistic and symbolic), conservative ideologies (social dominance orientation [SDO] and right-wing authoritarianism [RWA]), and prejudice against immigrants. Data were collected with a cross-sectional design in two samples: non-student Italian adults (n = 223) and healthcare professionals (n = 679). Results were similar in both samples and indicated that symbolic and realistic threats, as well as SDO and RWA, positively and significantly predicted anti-immigrant prejudice. Moreover, the model considering SDO and RWA as mediators of threats’ effects on prejudice showed a better fit than the model in which ingroup threats mediated the effects of SDO and RWA on prejudice against immigrants. Accordingly, SDO and RWA partially mediated the effect of both symbolic and realistic threats, which maintained a significant effect on prejudice against immigrants, however.     

Improving left spatial neglect through music scale playing

The study assessed whether the auditory reference provided by a music scale could improve spatial exploration of a standard musical instrument keyboard in right‐brain‐damaged patients with left spatial neglect. As performing music scales involves the production of predictable successive pitches, the expectation of the subsequent note may facilitate patients to explore a larger extension of space in the left affected side, during the production of music scales from right to left. Eleven right‐brain‐damaged stroke patients with left spatial neglect, 12 patients without neglect, and 12 age‐matched healthy participants played descending scales on a music keyboard. In a counterbalanced design, the participants' exploratory performance was assessed while producing scales in three feedback conditions: With congruent sound, no‐sound, or random sound feedback provided by the keyboard. The number of keys played and the timing of key press were recorded. Spatial exploration by patients with left neglect was superior with congruent sound feedback, compared to both Silence and Random sound conditions. Both the congruent and incongruent sound conditions were associated with a greater deceleration in all groups. The frame provided by the music scale improves exploration of the left side of space, contralateral to the right hemisphere, damaged in patients with left neglect. Performing a scale with congruent sounds may trigger at some extent preserved auditory and spatial multisensory representations of successive sounds, thus influencing the time course of space scanning, and ultimately resulting in a more extensive spatial exploration. These findings offer new perspectives also for the rehabilitation of the disorder.     

Female Adolescents with Eating Disorders,Parental Psychopathological Risk and Family Functioning

Epidemiological studies on adolescents with eating disorders demonstrate a high prevalence of disordered eating behaviors, with a higher prevalence of eating disorders among girls. Several studies have recently demonstrated an association between female adolescents’ eating disorders, parental psychopathological risk, and an impaired family functioning with poor quality of the relationships among family members. On the basis of these premises, we conducted a cross-sectional study initially recruiting 243 families of female adolescents affected by anorexia nervosa (Group A), bulimia nervosa (Group B), and binge eating disorder (Group C) (average age 14–17) to assess their psychological profile (SCL90-R), specific representations of their family functioning (FACES-IV), and the possible effect of adolescents’ psychological profiles and parents’ psychopathological risk on family functioning. Our results indicate that adolescents and parents in Groups A, B, and C show an unequivocal psychopathological profile; in particular, adolescents with anorexia present the most severe psychopathological risk. Further, our results show that adolescents and their parents differ in their perception of their family functioning. More specifically, adolescents with anorexia perceive their family as highly disengaged, poorly interwoven, and rigid, in addition cohesion and communication qualities are perceived as low. Interestingly, parental psychopathological risk predicts adolescents’ specific perception of their family functioning. These findings may guide clinical interventions as they suggest that distinct maternal psychopathological symptoms can be associated with a variety of clinical configurations in their offspring, whereas paternal psychopathological risk may be present in adolescents suffering from all forms of eating disorders.     

Personality,Positivity and Happiness: A Mediation Analysis Using a Bifactor Model

Recent studies suggested an important role of neuroticism and extraversion facets as incremental predictors of subjective well-being outcomes. Research has shown that positive cognitions mediated the relation between personality traits and well-being. The present study examined the relationship between neuroticism and extraversion, measured as general and group factors, and subjective happiness through a general positivity factor. 770 community participants (69.4 % females; M = 55.34; SD = 16.01) completed personality, satisfaction with life, optimism, self-esteem, and subjective happiness scales. A bifactor model was used to parse general and specific variance components for multifaceted constructs. The general positivity factor completely mediated neuroticism-subjective happiness relationships and overlapped with general neuroticism, whilst it partially mediated extraversion-subjective happiness ones. Other paths to happiness involved cheerfulness and enthusiasm. Assertiveness, activity level and excitement-seeking had a weak relationship with subjective happiness and only through positivity. Gregariousness and friendliness had neither direct nor indirect effects on subjective happiness. Life satisfaction had a twofold role as a component of positivity as well as providing an independent contribution to variance in subjective happiness. In keeping with previous research, neuroticism acted as a sort of general negativity factor. Cheerfulness and extraversion made an incremental contribution to variance in subjective happiness. Our findings support the utility of a multifaceted approach to study pathways from personality to well-being. Theoretical and practical implications for promoting well-being were discussed.     

Neuromodulation can reduce aggressive behavior elicited by violent video games

Research has shown that exposure to violent media increases aggression. However, the neural underpinnings of violent-media-related aggression are poorly understood. Additionally, few experiments have tested hypotheses concerning how to reduce violent-media-related aggression. In this experiment, we focused on a brain area involved in the regulation of aggressive impulses—the right ventrolateral prefrontal cortex (rVLPFC). We tested the hypothesis that brain polarization through anodal transcranial direct current stimulation (tDCS) over rVLPFC reduces aggression related to violent video games. Participants (N = 79) were randomly assigned to play a violent or a nonviolent video game while receiving anodal or sham stimulation. Afterward, participants aggressed against an ostensible partner using the Taylor aggression paradigm (Taylor Journal of Personality, 35, 297–310, 1967), which measures both unprovoked and provoked aggression. Among those who received sham stimulation, unprovoked aggression was significantly higher for violent-game players than for nonviolent-game players. Among those who received anodal stimulation, unprovoked aggression did not differ for violent- and nonviolent-game players. Thus, anodal stimulation reduced unprovoked aggression in violent-game players. No significant effects were found for provoked aggression, suggesting tit-for-tat responding. This experiment sheds light on one possible neural underpinning of violent-media-related aggression—the rVLPFC, a brain area involved in regulating negative feelings and aggressive impulses.