Cognitive mediation of intervention effects on physical exercise: Causal models for the adoption and maintenance stage

Objective: To investigate how the effects of a group-based intervention program (MoVo-LISA) on exercise behaviour were mediated by cognitive variables. Different causal models mapping the short-term (adoption) and long-term (maintenance) intervention effects were tested using path analyses.

Design: N?=?220 in-patients of a rehabilitation clinic were assigned to an usual care or intervention group (quasi-experimental design). Questionnaire-based assessment was conducted at baseline; discharge; and at six weeks, six months and 12 months post discharge.

Measures: The potential mediator variables were outcome expectations, self-efficacy, strength of goal intention (intention strength), self-concordance, action planning and barrier management.

Results: Observed intervention effects on exercise behaviour (p?<?0.05) were mediated by intention strength at the adoption and maintenance stages, by action planning only at the adoption, and by barrier management only at the maintenance stage. Self-efficacy and outcome expectations were only indirectly involved in these mediations by affecting intention strength and self-concordance.

Conclusion: This is the first study to track the cognitive mediation processes of intervention effects on exercise behaviour over a long time-period by differentiating the adoption and maintenance stages of behaviour change. The findings emphasise the importance of deconstructing intervention effects (modifiability vs. predictive power of a mediator) to develop more effective interventions.     

Always look on the broad side of life: happiness increases the breadth of sensory memory

Research has shown that positive affect increases the breadth of information processing at several higher stages of information processing, such as attentional selection or knowledge activation. In the present study, we examined whether these affective influences are already present at the level of transiently storing incoming information in sensory memory, before attentional selection takes place. After inducing neutral, happy, or sad affect, participants performed an iconic memory task which measures visual sensory memory. In all conditions, iconic memory performance rapidly decreased with increasing delay between stimulus presentation and test, indicating that affect did not influence the decay of iconic memory. However, positive affect increased the amount of incoming information stored in iconic memory. In particular, our results showed that this occurs due to an elimination of the spatial bias typically observed in iconic memory. Whereas performance did not differ at positions where observers in the neutral and negative conditions showed the highest performance, positive affect enhanced performance at all positions where observers in the neutral and negative conditions were relatively "blind." These findings demonstrate that affect influences the breadth of information processing already at earliest processing stages, suggesting that affect may produce an even more fundamental shift in information processing than previously believed.     

How affective states, task difficulty, and self-concepts influence the formation and consequences of performance expectancies

Positive versus negative affective states are associated with the use of broad versus specific knowledge structures. We predicted that specific self-concepts and task difficulty would affect performance expectancies only for individuals in a negative mood; for individuals in a positive mood, only the general self-concept, but not task difficulty, would affect performance expectancies. In an experiment, we manipulated task difficulty and mood, and we assessed self-concepts, performance expectancies, and task performance. The expected interactions for the formation of performance expectancies (mood × general self-concept, mood × specific self-concept, mood × difficulty) were found. Concerning the consequences of performance expectancies, we predicted that expectancies would affect actual performance only if the task was difficult and if task difficulty was taken into account when the expectancy is generated. This hypothesis was supported: The relationship between performance expectancies and actual performance was significant only for difficult tasks and given negative mood.     

Read-out of emotional information from iconic memory: the longevity of threatening stimuli

Previous research has shown that emotional stimuli are more likely than neutral stimuli to be selected by attention, indicating that the processing of emotional information is prioritized. In this study, we examined whether the emotional significance of stimuli influences visual processing already at the level of transient storage of incoming information in iconic memory, before attentional selection takes place. We used a typical iconic memory task in which the delay of a poststimulus cue, indicating which of several visual stimuli has to be reported, was varied. Performance decreased rapidly with increasing cue delay, reflecting the fast decay of information stored in iconic memory. However, although neutral stimulus information and emotional stimulus information were initially equally likely to enter iconic memory, the subsequent decay of the initially stored information was slowed for threatening stimuli, a result indicating that fear-relevant information has prolonged availability for read-out from iconic memory. This finding provides the first evidence that emotional significance already facilitates stimulus processing at the stage of iconic memory.     

Die Validit?t dynamisch-ver?nderbarer Risikofaktoren bei der Vorhersage einschl?giger R��ckf?lle p?dosexueller Straft?ter

The present study examines the predictive validity of dynamic risk factors for the prediction of sexual recidivism in a sample of pedosexual offenders (N?=?135) released from the Austrian prison system between 2002 and 2005. Static-99 was used to rate static risk factors and in order to measure dynamic risk factors Stable-2000 and Stable-2007 were applied. In addition to the demonstration of results about the interrater reliability the results about the predictive and incremental validity of the dynamic risk assessment are presented. After a mean follow-up period of 5½ years Static-99, Stable-2000 and Stable-2007 showed excellent interrater reliability and good predictive validity for the prediction of sexual recidivism. Furthermore, Stable-2007 showed better predictive accuracy than its predecessor and added incremental predictive validity beyond Static-99.     

Beyond quantitative decline: conceptual shifts in adolescents' development of interest in mathematics

Research has shown that the average values for academic interest decrease during adolescence. Looking beyond such quantitative decline, we explored qualitative change of interest in the domain of mathematics across adolescence. Study 1 was based on a longitudinal data set (annual assessments from Grade 5 to Grade 9; N = 3,193). Latent variable modeling showed that the measurement coefficients of the latent variable of interest (intercepts, structural weights, and error variances) significantly differed across time points, indicating structural changes of the construct. Study 2 was based on interviews with adolescents (Grades 5 and 9, N = 70). Cognitive validation was used to explore differences in subjective concepts of interest across age groups. As expected, there were significant age-related differences, indicating a shift from an affect-laden concept in 5th grade to a more cognitively oriented concept in 9th grade. The findings suggest that developmental research should integrate quantitative and qualitative perspectives of construct change over time and pay more attention to issues of measurement invariance and qualitative changes of constructs over time.     

To judge a book by its weight you need to know its content: Knowledge moderates the use of embodied cues

Participants evaluated a book as more important when it weighed heavily in their hands (due to a concealed weight), but only when they had substantive knowledge about the book. Those who had read a synopsis (Study 1), had read the book (Study 2) and knew details about its plot (Study 3) were influenced by its weight, whereas those unfamiliar with the book were not. This contradicts the widely shared assumption that metaphorically related perceptual inputs serve as heuristic cues that people primarily use in the absence of more diagnostic information. Instead, perceptual inputs may increase the accessibility of metaphorically congruent knowledge or may suggest an initial hypothesis that is only endorsed when supporting information is accessible.     

Causal Models of Physical Exercise Participation: Testing the Predictive Power of the Construct "Pressure to Change"

This study examines 2 different causal models to predict physical exercise motivation and behavior under a longitudinal perspective. The first model includes 5 latent variables that were hypothesized to have an impact on exercise intention and behavior: behavior-specific social support, exercise self-efficacy, perceived health benefits, perceived barriers, and subjective vulnerability to cardiovascular disease. The second model was based on all variables of the first model, but additionally included the new variable "pressure to change." Pressure to change was defined as the extent to which a person feels the necessity that specific personal life circumstances (e.g., health status, social relations) may not remain as they are and ought to be changed. It was hypothesized that the inclusion of health-related pressure to change would result in a better prediction of exercise intention. The proposed causal models were tested separately at the stages of exercise adoption and maintenance. Covariance structure analyses (LISREL) confirmed that pressure to change may be an important factor in the motivational process that leads to the adoption of regular physical exercise. Adding this latent variable to the basic model improved the amount of explained variance in exercise intention by 6%. Furthermore, the results did not support the assumption that cognitive control is critical especially during the acquisition of exercise behaviors, but may be less influential once the behavioral routines have been established. Our data rather indicate that regular physical exercise, even if performed on a regular basis for years, always remains a behavior that requires a high level of cognitive guidance.