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.     

Linguistic constraints on statistical computations: the role of consonants and vowels in continuous speech processing

Speech is produced mainly in continuous streams containing several words. Listeners can use the transitional probability (TP) between adjacent and non-adjacent syllables to segment "words" from a continuous stream of artificial speech, much as they use TPs to organize a variety of perceptual continua. It is thus possible that a general-purpose statistical device exploits any speech unit to achieve segmentation of speech streams. Alternatively, language may limit what representations are open to statistical investigation according to their specific linguistic role. In this article, we focus on vowels and consonants in continuous speech. We hypothesized that vowels and consonants in words carry different kinds of information, the latter being more tied to word identification and the former to grammar. We thus predicted that in a word identification task involving continuous speech, learners would track TPs among consonants, but not among vowels. Our results show a preferential role for consonants in word identification.     

Word length effect in early reading and in developmental dyslexia

Vocal reaction times were measured in Italian dyslexics and in proficient readers while they read single words. Three groups of control participants (for a total of 79) were tested. All were in the first, second or third grade of elementary school. Nine third graders with a low level of reading ability when assessed by standard reading procedures were also tested. Results indicated that vocal RTs of control participants were faster and less sensitive to word length as a function of age; also, there was a particularly marked change between first and second graders. Dyslexics' vocal RTs and errors were much worse than those of peer control participants and resembled those of first grade controls. It is suggested that normal readers in an orthographically transparent language (Italian) adopt a lexical strategy quite early in their learning. On the contrary, dyslexics seem unable to learn this mode of processing and continue to use a sub-lexical reading procedure.