Assessing the Approximate Number System: no relation between numerical comparison and estimation tasks

Whether our general numerical skills and the mathematical knowledge that we acquire at school are entwined is a debated issue, which many researchers are still striving to investigate. The findings reported in the literature are actually inconsistent; some studies emphasized the existence of a relationship between the acuity of the Approximate Number System (ANS) and arithmetic competence, while some others did not observe any significant correlation. One potential explanation of the discrepancy might stem from the evaluation of the ANS itself. In the present study, we correlated two measures used to index ANS acuity with arithmetic performance. These measures were the Weber fraction (w), computed from a numerical comparison task and the coefficient of variation (CV), computed from a numerical estimation task. Arithmetic performance correlated with estimation CV but not with comparison w. We further investigated the meaning of this result by taking the relationship between w and CV into account. We expected a tight relation as both these measures are believed to assess ANS acuity. Crucially, however, w and CV did not correlate with each other. Moreover, the value of w was modulated by the congruity of the relation between numerical magnitude and non-numerical visual cues, potentially accounting for the lack of correlation between the measures. Our findings thus challenge the overuse of w to assess ANS acuity and more generally put into question the relevance of correlating this measure with arithmetic without any deeper understanding of what they are really indexing.     

Coping, competence, and aggression prevention: Part 1. Developmental model

According to coping-competence theory, current challenge encounters determine future life outcomes and competence. This theory provides a testable causal model of the development of persistent aggression. The model suggests that protective circumstances enable resilient youth to cope prosocially (helping self without harming others) even with uncontrollable challenges. Unprepared for language-based prosocial coping, high-risk youths' antisocial coping yields adverse life outcomes (e.g., school expulsion, teen pregnancy, police arrest). Each adverse outcome increases future antisocial coping, threatens future competence (i.e., self-definition, social reputation, dominant coping strategy), and aggravates status on risk-protection variables (i.e., parent warmth and skill, child temperament and intelligence). The same structural model may apply across the lifespan with changes in indicators and weighting of constructs during key developmental transitions. Part 2 presents the model's prevention implications.     

Assessing Quality of Life in an Obesity Observational Study: a Structural Equation Modeling Approach

Applied Research in Quality of Life - Quality of life (QOL) of a patient is usually computed as the (weighted) sum of items and analysed by means of multiple regressions to evaluate its...     

From Intent to Enrollment,Attendance, and Participation in Preventive Parenting Groups

Applying the Theory of Planned Behavior (TPB) to the process of engagement in preventive parenting groups, we tested the ability of family and child measures to predict intent to enroll, enrollment, attendance, and quality of participation in PACE (Parenting Our Children to Excellence). PACE is a prevention trial testing the efficacy of a structured program to promote effective parenting and reduce risk of adverse child outcomes. Mothers of preschoolers (N=451) from diverse ethnic and socioeconomic backgrounds participated at two sites. Results showed that mothers who stated their intent to enroll reported relatively few time constraints but high levels of stress, as did mothers who enrolled. The latter also experienced elevated levels of oppositional defiant child behaviors, indicating that the program reached families who stood to benefit from it. Attendance, which was also best predicted by few time constraints, was high (with 49% of mothers who enrolled attending 5 or more of 8 sessions). In turn, attendance predicted quality of participation (at 1 site only), with mothers attending more sessions participating more actively and enthusiastically. Ethnicity and, with a few exceptions, socioeconomic circumstances and site, were not significant predictors of intent, enrollment, or attendance. Results provide qualified support for the TPB and illustrate its relevance to preventive research and interventions.     

Scene perception, gaze behavior, and perceptual learning in virtual environments.

More and more immersive environments are developed to provide support for learning or training purposes. Ecological validity of such environments is usually based on learning performance comparisons between virtual environments and their genuine counterparts. Little is known about learning processes occurring in immersive environments. A new technique is proposed for testing perceptual learning during virtual immersion. This methodology relies upon eye-tracking technologies to analyze gaze behavior recorded in relation to virtual objects' features and tasks' requirements. It is proposed that perceptual learning mechanisms engaged could be detected through eye movements. In this study, nine subjects performed perceptual learning tasks in virtual immersion. Results obtained indicated that perceptual learning influences gaze behavior dynamics. More precisely, analysis revealed that fixation number and variability in fixation duration varied with perceptual learning level. Such findings could contribute in shedding light on learning mechanisms as well as providing additional support for validating virtual learning environments.     

Competing for a desired reward in the Stroop task: when attentional control is unconscious but effective versus conscious but ineffective.

Recent studies using Stroop's paradigm have shown that word recognition processes can be controlled when the local context of the task is manipulated. In the present study, factors related to the participants' broader context (i.e., presence vs. absence of a competitor and of a desired reward) were manipulated. The results (1) support the conclusion that control of semantic-level activation can be unconscious but effective versus conscious but ineffective, (2) suggest that unconscious control alone operates on line (i.e., when the participant is responding), and (3) clarify the impact of socio-contextual factors that have been confounded in past research. Taken together, these findings strengthen the view that word recognition processes are controllable and offer new reasons to pay constant attention to the social environment of cognition.     

Selecting one of two regular sound sequences: perceptual and motor effects of tempo

This study assessed the influence of tempo on selecting a sound sequence. In Exp. 1, synchronization with one of the two regular subsequences in a complex sequence was measured. 30 participants indicated a preference for the fastest subsequence when subsequences were in a slow tempo range (> or = 500 msec. IOI), and with the slower subsequence when they were in the fast tempo range (< or = 300 msec. IOI). These results were replicated using a perceptual task (Exp. 2 and 3) in which the 30 listeners had to detect a temporal irregularity in one of the two subsequences. Detection was better when the temporal irregularity was in the fastest subsequence than in the slowest one when the complex sequence was in a slow tempo range (> or = 500 msec. IOI) and the reverse was obtained when the complex sequence was in a fast tempo range (< or = 180 msec. IOI). These results have implications for design of auditory alarms.     

Parent training outcome: does active parental involvement matter?

Eighty-two families with noncompliant, aggressive children participated in a behavioral parent training program to modify dysfunctional family relationships. At follow-ups ranging from 1 to 3 yr, each family was assigned to one of two groups according to its treatment outcome status (success, no success). The groups were then compared on eight measures of social and material standing found to be predictive of outcome in previous research, and on two measures of parental involvement in treatment assumed to act as process variables which may account for the relationship between social and material standing and outcome. Contrary to prediction, the measures of parental involvement failed to account for any significant amount of variance in outcome. Many families characterized by severe adverse social and material conditions may be unable to benefit from behavioral parent training, regardless of the extent to which they participate in treatment. Possible clinical and theoretical implications are briefly discussed.