Discriminability of fixed-ratio schedules for pigeons: effects of payoff values

Three pigeons, previously trained to discriminate different numbers of responses (fixed ratios), were tested under different reinforcement contingencies (payoff matrices) at two levels of sensitivity. For one subject, relative reinforcement magnitude was varied—at first, across sessions and then, at midsession by reversing values—without exteroceptive cues. For another, relative reinforcement magnitude and/or probability was varied every 50 trials with cues by correlating different payoff matrices with different key colors. For the third subject, relative reinforcement probability was varied more frequently with cues—in the limit, at random—to demonstrate stimulus control of response bias on a trial-by-trial basis. A signal-detection analysis showed that bias changed with payoffs, for as many as seven different matrices, while sensitivity remained unchanged. The obtained functions (receiver operating characteristics) were similar under different payoff conditions, which suggests that a single mechanism controls bias. However, they differed enough in slope to require a relatively complex account (e.g., the general Gaussian model of detection theory).     

Efficiency of visual information processing in children at-risk for dyslexia: habituation of single-trial ERPs

To investigate underlying learning mechanisms in relation to the development of dyslexia, event-related potentials to visual standards were recorded in five-year-old pre-reading children at-risk for familial dyslexia (n=24) and their controls (n=14). At the end of second grade the children aged 8 years were regrouped into three groups according to literacy level and risk factor. Single-trial analyses revealed N1 habituation in the normal-reading controls, but not in the normal-reading at-risks, and a N1 amplitude increase in the group of poor-reading at-risks and poor-reading controls. No P3 habituation was found in either group. The normal-reading at-risk group exhibited the longest N1 and P3 latencies, possibly compensating for their reduced neuronal activity during initial information extraction. In contrast, the poor-reading group only showed prolonged P3, and their increase in (initial small) N1 amplitude together with normal N1 latencies, suggests inefficient processing in an early time window, which might explain automatisation difficulties in dyslexic readers.     

Foundations for self and other: a study in autism

There is controversy over the basis for young children's experience of themselves and other people as separate yet related individuals, each with a mental perspective on the world - and over the nature of corresponding deficits in autism. Here we tested a form of self-other connectedness (identification) in children with and without autism, who were group-matched according to CA (approximately 6 to 16 years) and verbal MA (approximately 2 1/2 to 14 years), and therefore IQ. We gave two forms of a novel 'sticker test' in which children needed to communicate to another person where on her body she should place her sticker-badge. Across the trials of Study 1, all of the non-autistic children pointed to their own bodies at least once, but over half the children with autism failed to point to themselves at all, even though they communicated successfully in other ways. In Study 2, where a screen was introduced to hide the tester's body, group differences in the children's communicative self-orientated gestures were most marked after the tester had 'modelled' a point-to-herself gesture in communicating to the child. Our interpretation is that autism involves a relative failure to adopt the bodily-anchored psychological and communicative stance of another person. We suggest that this process of identification is essential to self-other relations and grounds young children's developing understanding of minds.     

Pleasure,Arousal, Dominance: Mehrabian and Russell revisited

This paper presents a discursive review of the dimensions pleasure, arousal and dominance that Mehrabian and Russell developed in 1974 to assess environmental perception, experience, and psychological responses. Since then numerous researchers applied these dimensions to assess the experience of the physical environment and its perceived qualities. Although the dimensions appeared to be useful, there is a long-lasting debate going on among environmental psychologists about the interpretation of pleasure, arousal and dominance and its underlying mechanisms. Due to the lack of clarity researchers use different adjectives to describe environmental experiences, which makes any comparison between research findings difficult. This paper shows that the three dimensions can be linked to the current ABC Model of Attitudes: pleasure, arousal and dominance can be respectively related to affective, cognitive and conative responses, i.e. Affect, Cognition and Behaviour (ABC). In addition, connecting the three dimensions to the triad feeling, thinking and acting, can also help to improve our understanding, interpretation and measurement of pleasure, arousal and dominance. Based on this review, it is proposed to re-introduce the three dimensions and to replace the nowadays often used two dimensional model with pleasure and arousal by a three dimensional model, including dominance as a third dimension, to represent the complete range of human responses.     

Personality and Illness Adaptation in Adults with Type 1 Diabetes: The Intervening Role of Illness Coping and Perceptions

Inspired by the common sense model, the present cross-sectional study examined illness perceptions and coping as intervening mechanisms in the relationship between Big Five personality traits and illness adaptation in adults with Type 1 diabetes. A total of 368 individuals with Type 1 diabetes (18–35 years old) completed questionnaires on personality, diabetes-related problems, illness perceptions, and illness coping. First, Neuroticism, Agreeableness, and Conscientiousness predicted patients’ illness adaptation, above and beyond the effects of sex, age, and illness duration. Second, illness coping was found to be an important mediating mechanism in the relationship between the Big Five and illness adaptation. Finally, perceived consequences and perceived personal control partially mediated the relationship between the Big Five and illness coping. These findings underscore the importance of examining patients’ personality to shed light on their daily functioning and, hence, call for tailored intervention programs which take into account the personality of the individual patient.     

Historical explanation,folk psychology,and narrative

Abstract

The aim of this article is to review the recent popularity of casuistry as a model of moral inquiry. I argue that proponents of casuistry do not endorse the particularist epistemology that seems to be implied by their position, and that this is why casuistry does not seem to present something really new in comparison to ‘top-down’ generalist approaches. I contend that casuistry should develop itself as a (moderately) particularist position and that the challenge for the defender of casuistry is to come up with ideas that strengthen the (‘intuitionist’) model of rationality that underlies most forms of particularism.     

Identity statuses in young adult employees: Prospective relations with work engagement and burnout

The importance of identity statuses for individuals' well-being and psychosocial functioning has been demonstrated abundantly in high school and college samples. The present longitudinal study complemented this research line by (a) focusing on identity clusters or statuses in a sample of 300 working young adults (21–40 years of age), and (b) investigating the concurrent and prospective implications of these identity statuses for work engagement and burnout. Based on a recently developed dimensional model of personal identity formation, five distinct statuses were obtained, largely replicating previous research on identity clusters. These five statuses were meaningfully differentiated on the basis of their associations with the outcome measures, with the identity achievement status showing the most optimal profile (low burnout, high engagement) and the diffused diffusion status the least adjusted profile across time. Implications and suggestions for future research are discussed.