Automatic analysis of altered gait in arylsulphatase A-deficient mice in the open field

In current research with laboratory animals, observing their dynamic behavior or locomotion is a laborintensive task. Automatic continuous monitoring can provide quantitative data on each animal’s condition and coordination ability. The objective of the present work is to develop an automated mouse observation system integrated with a conventional open-field test for motor function evaluation. Data were acquired from 86 mice having a targeted disruption of the arylsulphatase A (ASA) gene and having lowered coordinated locomotion abilities as a symptom. The mice used were 36 heterozygotes (12 females) and 50 knockout mice (30 females) at the age of 6 months. The mice were placed one at a time into the test setup, which consisted of a Plexiglas cage (53× 34.5 × 26 cm) and two fluorescent bulbs for proper illumination. The transparent cage allowed images to be captured from underneath the cage, so image information could be obtained about the dynamic variation of the positions of the limbs of the mice for gait reconstruction. Every mouse was recorded for 10 min. Background subtraction and color filtering were used to measure and calculate image features, which are variables that contain crucial information, such as the mouse’s position, orientation, body outline, and poßible locations for the mouse’s paws. A set of heuristic rules was used to prune implausible paw features and label the remaining ones as front/hind and left/right. After we had pruned the implausible paw features, the paw features that were consistent over subsequent images were matched to footprints. Finally, from the measured footprint sequence, eight parameters were calculated in order to quantify the gait of the mouse. This automatic observation technique can be integrated with a regular open-field test, where the trajectory and motor function of a free-moving mouse are measured simultaneously.     

Alexithymia and interpersonal problems: A study of natural language use

The concept of alexithymia refers to difficulties in experiencing, verbalizing and regulating emotions. The relationship between alexithymia and interpersonal style is investigated by means of lexical content analysis. It is hypothesized that alexithymia is related to less frequent and less varied use of communication words and references to others. Alexithymia was measured with the 20-item Toronto Alexithymia Scale and the Toronto Structured Interview for Alexithymia. The Clinical Diagnostic Interview was administered to 50 psychiatric inpatients, transcribed verbatim, and computer-analysed with the Linguistic Inquiry and Word Count-dictionary. Results showed that alexithymia is related to a less complex vocabulary for communication words. Contradictory results for some subscales of the TAS-20 and the TSIA however compromise their construct validity.     

Childhood Emotional Abuse and Maladaptive Coping in Adults Seeking Treatment for Substance Use Disorder

Little is understood about distinct traumatic exposures and their relationship to later coping strategies. Adults receiving treatment for substance use were assessed for experiential avoidance and a range of traumatic exposures. Only childhood emotional abuse significantly predicted experiential avoidance.     

Visual rays are parallel

We show that human observers using monocular viewing treat the pencil of 'visual rays' that diverges from the vantage point as experientally parallel. This oddity becomes very noticeable in the case of wide-angle presentations, where the angle subtended by a pair of visual rays may be as large as the angular size of the display. In our presentations such angles subtended over 100 deg. There are various ways to demonstrate the effect; in this study we measure the attitudes of pictorial objects that appear to be situated in mutually parallel attitudes in pictorial space. Our finding is that such objects appear parallel if they are similarly oriented with respect to the local visual rays. This leads to 'errors' in the judgment of mutual orientations of up to 100 deg. Although this appears to be the first quantitative study of the effect, we trace it to qualitative reports by Helmholtz (late 19th century) and Kepler (early 17th century) as well as speculation by early authors (AD 500). The effect has apparently been noticed by visual artists from the late middle ages to the present day.     

Match making and match breaking: The nature of match within and around job design

We explore the notion of ‘match’. In the context of job design, this is congruence or correspondence between two or more job characteristics (e.g. cognitive demands and cognitive control). This congruence is thought to benefit health, well‐being, and performance. The origins of the match concept lie in buffering models of work stress, where resources such as workplace social support and job control are thought to attenuate deleterious effects of adverse job characteristics like excessive job demands. We outline the historical developments in work stress research that has led to notions of match, contrast match with the related concept of person‐environment fit, explore current conceptualizations and operationalizations of match, and outline how the concept of match can be developed.     

Student teachers’ competence and career certainty: the effects of career anxiety and perceived control

In comparison to other professional faculties, student teachers are less certain about their career decisions. Consequently, examining the factors that influence their perceptions of career competence and certainty may be beneficial for their professional development. We examined how student teachers’ (n = 194) gender, grade of instruction, practicum, career anxiety, and perceived control affected their career competence and certainty. Anxiety had large and negative effects on competence and certainty. In contrast, primary control enhanced competence whereas secondary control enhanced certainty. High-practicum ratings were also associated with greater competence and certainty; however, these effects were mediated by anxiety and perceived control. These findings help us understand the transition that student teachers make from studentship to becoming professional teachers.     

A Longitudinal Investigation of Sport Participation, Peer Acceptance, and Self-esteem among Adolescent Girls and Boys

The present investigation was designed to explore the relations between sport participation, peer acceptance, and global self-esteem. Peer acceptance was considered as a possible mediator of the relationship between sport participation and global self-esteem. The sample included girls (N?=?4,689) and boys (N?=?5,811) between the ages of 12 and 21 (M?=?15 years) who were part of the National Longitudinal Study of Adolescent Health. Analyses revealed that peer acceptance partially mediated the relation between sport participation and global self-esteem for girls as well as boys. Findings suggest the importance of considering how sport participation and self-evaluations in particular domains may contribute to global feelings of self-worth. The role of peers in this relationship is discussed in relation to changing social attitudes about girls’ sport participation.