Situated robotics: from learning to teaching by imitation

This paper presents an approach to imitation learning in robotics focusing on low level behaviours, so that they do not need to be encoded into sets and rules, but learnt in an intuitive way. Its main novelty is that, rather than trying to analyse natural human actions and adapting them to robot kinematics, humans adapt themselves to the robot via a proper interface to make it perform the desired action. As an example, we present a successful experiment to learn a purely reactive navigation behaviour using robotic platforms. Using Case Based Reasoning, the platform learns from a human driver how to behave in the presence of obstacles, so that no kinematics studies or explicit rules are required.     

Predicting infant attachment classification from multiple, contemporaneous measures of maternal care

This investigation was designed to test whether stylistic differences in maternal caregiving were associated with both secure and insecure mother-infant attachment classifications in a low-income sample. Multiple measures of maternal interactive behavior and care were collected from a sample of 95 urban, low-income mothers and their 12-month-old infants. Contemporaneous relations to attachment were found only at the broad level of composite scores of caregiving. Scores derived from different measures were aggregated to create composites reflecting three caregiver styles—sensitive, controlling, and unresponsive. Mothers of infants with secure attachment classifications showed greater sensitivity and less controlling behavior than mothers of infants with resistant and avoidant attachments, respectively. Mothers of infants with resistant attachments appeared less responsive to their infants' signals than those of infants with avoidant attachments. Group differences were significant, but modest. These results contribute to the growing body of studies relating parental care with infant attachment patterns and indirectly support the more recent conceptual work on intergenerational transmission of attachment. They also raise methodological issues that need to be considered in future work on caregiving and infant-mother attachment.     

The role of episodic and semantic memory in episodic foresight

In this paper we describe a special form of future thinking, termed “episodic foresight” and its relation with episodic and semantic memory. We outline the methodologies that have largely been developed in the last five years to assess this capacity in young children and non-human animals. Drawing on Tulving's definition of episodic and semantic memory, we provide a critical analysis of the role that both types of memory might have on the episodic foresight tasks described in the literature. We conclude by highlighting some unanswered questions and suggesting future directions for research that could further our understanding of how memory is intimately connected to episodic foresight.     

Importing Logics

The novel notion of importing logics is introduced, subsuming as special cases several kinds of asymmetric combination mechanisms, like temporalization [8, 9], modalization [7] and exogenous enrichment [13, 5, 12, 4, 1]. The graph-theoretic approach proposed in [15] is used, but formulas are identified with irreducible paths in the signature multi-graph instead of equivalence classes of such paths, facilitating proofs involving inductions on formulas. Importing is proved to be strongly conservative. Conservative results follow as corollaries for temporalization, modalization and exogenous enrichment.     

The impact of social desirability on psychometric measures of aggression

Although many studies have focused on the effects of social desirability in personality measures, few have analysed its effects on such highly undesirable behaviour as aggressiveness. The present study analyzes the impact of social desirability on measures of direct and indirect aggression and on the relationships between both kinds of aggression with impulsivity, using a method that enables the content factors of the measures to be isolated from social desirability. Results showed that aggression measures are highly affected by social desirability and that the relationships between the two forms of aggression and impulsivity are due to the content measured by the tests and not to a common social desirability factor.     

Morningness-eveningness and sleep habits among adolescents: age and gender differences

Previous research has indicated the need to use large samples in different cultural contexts in order to clarify age and gender differences on morningness-eveningness and sleep habits. The goal of our research was to study the relationship between morningness-eveningness and sleep habits in a large sample of 2,649 adolescents between 12 and 16 years. The Morningness- Eveningness Scale for Children and an adaptation of the School Sleep Habits Survey measures were used. Results indicated a greater tendency toward eveningness with age and higher eveningness in 13- and 14-year-old girls. Older adolescents claimed later rising time on weekends, later bedtime and shorter sleep length, and greater social jetlag, weekend rise time delay, and weekend bedtime delay. Girls reported earlier rising time on weekdays, later rising time on weekends, longer sleep length on weekends, and greater social jetlag and weekend rising time delay. Lastly, evening oriented adolescents claimed later rising time and bedtime, shorter sleep length on weekdays but longer sleep duration on weekends, and greater social jetlag, weekend rising time delay, and weekend bedtime delay.     

Weight status misperception among Mexican young adults

Individuals who misperceive their body size are at risk for eating disorders, unhealthy weight control practices, and obesity-related diseases. This study assessed the prevalence and demographic, behavioral, and psychosocial correlates of agreement between perceived (self-reported) and actual (measured) body mass index categories in a sample of Mexican college applicants aged 18-20 years (N=3622; 52% female). Under two thirds (63.1%) accurately reported their weight status categories. Reporting accuracy was lower among overweight and obese participants. In multivariate analyses, overestimating was associated with female gender, younger age, lower level of parent education, and more hours of daily TV viewing; underestimating was associated with male gender and older age. In within-gender analyses, overestimating was associated with hours of TV among men and underestimating was positively associated with depressive symptoms among women. This study adds to a growing international literature on body weight status misperception among adolescents and young adults.     

The association between self-consciousness about appearance and psychological adjustment among newly diagnosed breast cancer patients and survivors: the moderating role of appearance investment

This study examined the moderating role of two facets of appearance investment (self-evaluative salience (SES) and motivational salience (MS)) in the relationship between self-consciousness about appearance and psychological adjustment (depression, anxiety and psychological quality of life (QoL)) in a sample of 134 breast cancer patients (68 newly diagnosed patients and 66 survivors). No significant differences were found between groups on body image variables. Among survivors, the associations between self-consciousness about appearance and the outcome variables were only significant at high (depression, psychological QoL) levels and at moderate (psychological QoL) levels of SES. Self-consciousness about appearance contributed to poor adjustment in both groups. This study demonstrates that appearance investment plays a key role in patients' adjustment and highlights the SES-MS distinction. SES seems to be a vulnerability factor for poor adjustment, and MS seems to be a protective factor that helps women cope with changes in appearance.     

Remarkable properties for diagnostics and inference of ranking data modelling

The Plackett-Luce model (PL) for ranked data assumes the forward order of the ranking process. This hypothesis postulates that the ranking process of the items is carried out by sequentially assigning the positions from the top (most liked) to the bottom (least liked) alternative. This assumption has been recently relaxed with the Extended Plackett-Luce model (EPL) through the introduction of the discrete reference order parameter, describing the rank attribution path. By starting from two formal properties of the EPL, the former related to the inverse ordering of the item probabilities at the first and last stage of the ranking process and the latter well-known as independence of irrelevant alternatives (or Luce's choice axiom), we derive novel diagnostic tools for testing the appropriateness of the EPL assumption as the actual sampling distribution of the observed rankings. These diagnostic tools can help uncovering possible idiosyncratic paths in the sequential choice process. Besides contributing to fill the gap of goodness-of-fit methods for the family of multistage models, we also show how one of the two statistics can be conveniently exploited to construct a heuristic method, that surrogates the maximum likelihood approach for inferring the underlying reference order parameter. The relative performance of the proposals, compared with more conventional approaches, is illustrated by means of extensive simulation studies.