A hidden markov model-based analysis framework using eye-tracking data to characterise re-orientation strategies in minimally invasive surgery

Natural Orifice Translumenal Endoscopic Surgery (NOTES) represents a new paradigm in minimally invasive surgery whereby an operator uses a flexible instrument to navigate within an anatomical space. The flexible instrument is introduced via a natural body orifice such as the mouth to perform an operative intervention controlled by the surgeon without making incisions in the anterior abdominal wall. It differs from laparoscopic (traditional keyhole) surgery in two main ways: (1) the instruments used in NOTES are not rigid as in laparoscopic surgery and not specifically designed for this application; and (2) there are no incisions in the anterior abdominal wall. Disorientation during NOTES is a significant problem because as in laparoscopic surgery the operator typically uses a 2D camera-monitor interface for visualisation by the camera at the site of the operation. Furthermore, the positional cue offered by the external component (outside the body) of the camera is absent, and camera navigation is more cumbersome. When the operator is disorientated, it is important to be able to re-orientate quickly to minimise potential surgical errors. It is hypothesised that when surgeons become disorientated, there exist discrete patterns in psychophysical behaviour which are associated with effective re-orientation, and that these patterns are recognisable. In this study, we examine visual re-orientation behaviour in 18 subjects using eye-tracker data in a model comprised of selective image manipulation of everyday objects in a box trainer. We characterise effective behaviour using a fixation sequence similarity-based hidden Markov model. We show that the output of this algorithm is reliable in differentiating visual behavioural sequences, and that there are specific behavioural patterns and strategies associated with successful re-orientation in this model. Good re-orientation strategy appears to rely on identification and focus on a central object within the scene and judging position of its surrounding peripheral objects, suggesting integration of both geometric and feature information in a systematic way. Using selective, inconsistent feature cues for re-orientation were associated with less effective performance.     

Psychiatrische Versorgung im europäischen Strafvollzug

Objective and methods:

We analysed administrative national data regarding mental health care and psychiatric prevalence in the penitentiary systems of 24 European countries. Data was provided by national experts via questionnaire.

Results:

There is a mixed approach for prison mental health care in European countries that either rely on separated psychiatric prison services or collaborate with specialized forensic or general mental health care services. Care provision in general is assessed as deficient. At all decisive points of detention, adequate screening or diagnostic routines are lacking. As a consequence, nothing is known about the prevalence of mental disorders in European prisons. At the moment, only a very limited number of secondary indicators are available for describing the problem.

Conclusion:

There is an urgent need for improving the reporting routines on mental disorders in prison inmates as a first step for improving substantially the mental health care provision for prisoners in European countries.     

Sweden: income and suicide

Previous publications have reported two conflicting patterns describing the relationship between income and suicide in Sweden; positive and negative. Methodologically the studies have differed, and the analysis has been limited to a few areas. To better understand the relationship, a nationwide, cross-sectional, ecological study of the 290 municipalities in Sweden was planned. OLS regression analyses showed the overall and female suicide rates were negatively related to income, while the effect on male suicide rates was not statistically significant. The results confirm earlier findings of a negative relationship between income and suicide.     

Students' daily emotions in the classroom: Intra‐individual variability and appraisal correlates

Background. Recent literature on emotions in education has shown that competence‐ and value‐related beliefs are important sources of students' emotions; nevertheless, the role of these antecedents in students' daily functioning in the classroom is not yet well‐known. More importantly, to date we know little about intra‐individual variability in students' daily emotions. Aims. The objectives of the study were (1) to examine within‐student variability in emotional experiences and (2) to investigate how competence and value appraisals are associated with emotions. It was hypothesized that emotions would show substantial within‐student variability and that there would be within‐person associations between competence and value appraisals and the emotions. Sample(s). The sample consisted of 120 grade 7 students (52%, girls) in 5 randomly selected classrooms in a secondary school. Method. A diary method was used to acquire daily process variables of emotions and appraisals. Daily emotions and daily appraisals were assessed using items adapted from existing measures. Results. Multi‐level modelling was used to test the hypotheses. As predicted, the within‐person variability in emotional states accounted for between 41% (for pride) and 70% (for anxiety) of total variability in the emotional states. Also as hypothesized, the appraisals were generally associated with the emotions. Conclusions. The within‐student variability in emotions and appraisals clearly demonstrates the adaptability of students with respect to situational affordances and constraints in their everyday classroom experiences. The significant covariations between the appraisals and emotions suggest that within‐student variability in emotions is systematic.     

Dimensions of Normal and Abnormal Personality: Elucidating DSM‐IV Personality Disorder Symptoms in Adolescents

ABSTRACT The present study aimed to elucidate dimensions of normal and abnormal personality underlying DSM‐IV personality disorder (PD) symptoms in 168 adolescents referred to mental health services. Dimensions derived from the Big Five of normal personality and from Livesley's (2006) conceptualization of personality pathology were regressed on interview‐based DSM‐IV PD symptom counts. When examined independently, both models demonstrated significant levels of predictive power at the higher order level. However, when added to the higher order Big Five dimensions, Livesley's higher and lower order dimensions afforded a supplementary contribution to the understanding of dysfunctional characteristics of adolescent PDs. In addition, they contributed to a better differentiation between adolescent PDs. The present findings suggest that adolescent PDs are more than extreme, maladaptive variants of higher order normal personality traits. Adolescent PDs seem to encompass characteristics that may be more completely covered by dimensions of abnormal personality. Developmental issues and implications of the findings are discussed.     

Objective Threat of Unemployment and Situational Uncertainty During a Restructuring: Associations with Perceived Job Insecurity and Strain

Purpose  

This study investigates objective threat of unemployment and situational uncertainty following restructuring in relation to perceived job insecurity and associated strain.     

Psychological Contracts and Counterproductive Work Behaviors: Employee Responses to Transactional and Relational Breach

Purpose  

This study extends the research on counterproductive work behavior (CWB) by examining the psychological contract breaches that trigger employee CWB. Specifically, we explored the relationship between transactional and relational contract breach and five forms of CWB (abuse, production deviance, sabotage, theft, and withdrawal). Further, we considered the role of situational and individual factors that mitigate CWB engagement and examined the moderating effects of organizational policies meant to deter CWB and personality (conscientiousness, agreeableness, and emotional stability).     

Agreeableness as a predictor of aggression in adolescence

This multi‐method research linked the Big Five personality dimensions to aggression in early adolescence. Agreeableness was the personality dimension of focus because this dimension is associated with motives to maintain positive interpersonal relations. In two studies, middle school children were assessed on the Big Five domains of personality. Study 1 showed that agreeableness was associated with both indirect and direct aggression. In addition, the link between agreeableness and aggression was strongest for direct strategies. Study 2 examined the hypotheses that agreeableness predicts social cognitions associated with aggression, peer reports of direct aggression, and teacher reports of adjustment. Agreeableness predicted peer reports of aggression and social cognitions associated with aggression. In addition, aggression mediated the link between agreeableness and adjustment. Results suggest that of the Big Five dimensions, Agreeableness is most closely associated with processes and outcomes related to aggression in adolescents. Aggr. Behav. 30:43–61, 2004. © 2004 Wiley‐Liss, Inc.