Making Sense of Dynamic Systems: How Our Understanding of Stocks and Flows Depends on a Global Perspective

Stocks and flows (SF) are building blocks of dynamic systems: Stocks change through inflows and outflows, such as our bank balance changing with withdrawals and deposits, or atmospheric CO₂ with absorptions and emissions. However, people make systematic errors when trying to infer the behavior of dynamic systems, termed SF failure, whose cognitive explanations are yet unknown. We argue that SF failure appears when people focus on specific system elements (local processing), rather than on the system structure and gestalt (global processing). Using a standard SF task (n = 148), SF failure decreased by (a) a global as opposed to local task format; (b) individual global as opposed to local processing styles; and (c) global as opposed to local perceptual priming. These results converge toward local processing as an explanation for SF failure. We discuss theoretical and practical implications on the connections between the scope of attention and understanding of dynamic systems.     

Manipulated flow reduces downstream defensiveness

Flow is a psychological state people experience when performing highly challenging tasks with a high degree of skill. It is related to happiness, creativity, and productivity. In three experiments, we developed a manipulation of flow and assessed its effects on subsequent defensive behavior. In all three experiments, participants who played a game with more features of flow (e.g. engagement, match of challenge and skill, performance feedback) reported more feelings of flow (e.g. enjoyment, concentration and interest) and less downstream defensiveness. The results suggest that we developed a flexible, reliable manipulation of flow, and that inducing people to experience flow may reduce their subsequent defensive behavior.     

Effects of translational background motion on visual localization

Three subjects were asked to judge the position of small spots of light flashed before, during or after rapid translational motion of the background grating pattern. Mislocalization of the spots was observed when the background moved during or immediately after presentation of the spot. In both cases, mislocalization always occurred in the direction of the fixation point. Furthermore, this mislocalization occurred only when the background moved in the opposite direction to the visual half-field in which the spot appeared. That is to say, a spot to the right of the fixation point was mislocalized when its background moved to the left, but not when it moved to the right, and the converse was also true. This finding was interpreted as reflecting a long-term adaptation to the optokinetic stimulation that we experience during forward and backward locomotion.     

Assessing emotional processing difficulties in normotensive individuals with high and isolated blood pressure elevations

This study examined the effect of sense modality (auditory/visual) on emotional dampening (reduced responsiveness to emotions with elevation in blood pressure). Fifty‐six normotensive participants were assessed on tasks requiring labelling and matching of emotions in faces and voices. Based on median split of systolic and diastolic blood pressures (SBP and DBP, respectively), participants were divided into low BP, high BP and isolated BP groups. On emotion‐labelling tasks, analysis revealed reduced emotion recognition in the high BP than the low BP group. On emotion‐matching tasks, reduced emotion recognition was noted in high and also isolated BP group as compared to low BP group for the task that required matching a visual target with one of the four auditory distractors. Our findings show for the first time that even isolated elevations in either SBP or DBP may result in emotional dampening. Furthermore, the study highlights that the emotional dampening effect generalises to explicit processing (labelling) of emotional information in both faces and voices—and that these effects tentatively occur during more pragmatic and covert (matching) emotion recognition processes too. These findings require replication in clinical hypertensives.     

Associations of transcranial doppler velocity,age, and gender with cognitive function in children with sickle cell anemia in Nigeria

Children with sickle cell anemia (SCA) have elevated cerebral blood velocity relative to healthy peers. The primary aim of this study was to evaluate the association between cerebral blood velocity, measured by transcranial Doppler (TCD) ultrasound, age, and gender with cognitive function in children with SCA in Nigeria. Eighty-three children (M_age = 9.10, SD = 1.90 years; 55% female) with SCA in Nigeria completed cognitive assessments and a TCD ultrasound. The association between TCD velocity and measures of perceptual reasoning (Raven’s Progressive Matrices), working memory (WISC-IV Digit Span), and executive planning (Tower of London, TOL) were assessed. Results showed that elevated TCD velocity significantly predicted lower scores on TOL Time Violations and Total Problem-Solving Time when controlling for BMI, hemoglobin level, and parent education, suggesting that TCD velocity is related to the efficiency of executive function. Further, age was negatively related to children’s performance on the Ravens Matrices and TOL Total Correct, and boys showed greater deficits on the TOL Total Correct relative to girls. Moderation analyses for gender showed that there was a conditional negative association between TCD velocity and Digit Span for boys, but not for girls. Findings suggest that children with SCA in Nigeria with elevated TCD velocity are at risk for deficits in efficiency of executive planning, and boys with elevated TCD velocity are particularly at increased risk for deficits in auditory working memory. Implications of this study are important for interventions to reduce cerebral blood velocity and the use of TCD in this population.     

教学设计中的成绩表现和心流体验:基于认知负荷视角

教学设计是为优化教学效果而形成的教学实施方案。为提高学习表现,认知负荷理论认为在组织教学设计时需考虑内、外认知负荷两大因素,但少有研究关注学生在学习过程中的体验。本研究通过单词复合性操纵内在负荷,通过呈现方式操纵外在负荷,探究两类负荷对心流体验及表现的影响。结果发现,内在负荷对心流及表现均有影响,外在负荷仅在低水平组表现出对心流及表现的影响,另外内外负荷在低水平组的表现上存在交互作用。结果表明,教学设计中的内在负荷是影响心流及表现的稳定因素,外在负荷不仅受知识水平影响,其对表现的有效性还受内在负荷的调节。     

Applying the extended theory of planned behaviour to predict Chinese people's non‐remunerated blood donation intention and behaviour: The roles of perceived risk and trust in blood collection agencies

Against the backdrop of critical clinical blood shortage in China in recent years, the present research extends the theory of planned behaviour by incorporating two constructs potentially of importance in influencing non‐remunerated blood donation behaviour, namely perceived risk and individual trust in blood collection agencies to predict Chinese people's non‐remunerated blood donation intention and behaviour. A survey was conducted to measure variables of the theory of planned behaviour, and other variables such as experience of non‐remunerated blood donation, perceived risk and individual trust in blood collection agencies. Data to assess non‐remunerated blood donation behaviour were collected via phone interviews. Results of the path analysis are as follows. Subjective norm, perceived behavioural control and individual trust in blood collection agencies are all positively associated with attitudes toward non‐remunerated blood donation, explaining 46.9% of the variance in this variable. Perceived risk is negatively associated with blood donation intention, while subjective norm and attitudes toward non‐remunerated blood donation are both positively associated with blood donation intention. Together, the three variables account for 28.4% of the variance in donation intention. Both having a positive association with non‐remunerated blood donation behaviour, the combination of blood donation intention and donation experience explains 42.8% of its variance.     

The ecumenical vision of Pope Francis: journeying together as fellow pilgrims − ‘the mystery of unity has already begun’

After reviewing some of the unique ecumenical steps taken by Pope Francis, this article examines briefly the three ecumenical paragraphs in Evangelii Gaudium. It presents them in the wider context of this post-synodal exhortation, of the ecumenical gestures and testimonies of Pope Francis, the ecumenical orientation of the Catholic Church and the ecumenical movement as such. It concludes with an outlook on a newly emerging ecumenical paradigm.