Time-dependent effects of treadmill exercise on aversive memory and cyclooxygenase pathway function

Exercise induces brain function adaptations and improves learning and memory; however the time window of exercise effects has been poorly investigated. Studies demonstrate an important role for cyclooxygenase-2 (COX-2) pathway function in the mechanisms underlying memory formation. The aim of present work was to investigate the effects of treadmill exercise on aversive memory and COX-2, PGE(2) and E-prostanoid receptors contents in the rat hippocampus at different time points after exercise has ended. Adult male Wistar rats were assigned to non-exercised (sedentary) and exercised (running daily for 20min, for 2weeks) groups. The inhibitory avoidance task was used to assess aversive memory and the COX-2, PGE(2) and E-prostanoid receptors (EP1, EP2, EP3 and EP4) levels were determined 1h, 18h, 3days or 7days after the last training session of treadmill exercise. The step down latency in the inhibitory avoidance, COX-2 and EP4 receptors levels were acutely increased by exercise, with a significant positive correlation between aversive memory performance and COX-2 levels. Increased EP2 content decreased PGE(2) levels were observed 7days after the last running session. The treadmill exercise protocol facilitates inhibitory avoidance memory and induces time-dependent changes on COX-2 pathways function (COX-2, PGE(2) and EP receptors).     

The bivalency effect: adjustment of cognitive control without response set priming

The occasional occurrence of bivalent stimuli, that is, stimuli with features relevant to two tasks, slows performance on subsequent tasks with univalent stimuli, including those which have no common features with bivalent stimuli (i.e., the “bivalency effect”). We have suggested that the bivalency effect might stem from an episodic context binding arising from the occasional occurrence of bivalent stimuli. However, as the same response set is used usually for univalent and bivalent stimuli, bivalent stimulus features may be negatively primed via response features. We investigated this possibility in two experiments, in which one group of participants used the same response keys for all tasks and another group used separate response keys. The results showed a comparable bivalency effect in both groups. Thus, it rather results from episodic context binding than from response set priming.     

Imams in Flanders: A Research Note

This paper presents the results of an exploratory, mixed-method study on imams in Flanders. The research question was mainly who are they?, in an attempt to draw the first picture of their socio-demographic background, ethnicity, functions, and expectations with respect to their position in Flanders, or in Belgium more broadly speaking. The first three sections give context information about Muslims, Islam, and mosques in Belgium and Flanders. In the next sections, the research design and the results are presented. This presentation focuses on four issues: imams as immigrants; their tasks and workload; their job situation and attitude towards official recognition and payment; and finally their ambiguous attitudes towards government initiatives. We give also some reflections in dialogue with research on imams in other Western European countries. The conclusion discusses the challenges for imams and the government to become real partners within the further integration process of the Muslim community in Flanders and Belgium.     

Dealing with laughter and ridicule in adolescence: relations with bullying and emotional responses

We investigated the fear of being laughed at (gelotophobia), the joy in being laughed at (gelotophilia), and the joy in laughing at others (katagelasticism) in adolescent students (N = 324, 13–15 years). Gelotophobia was associated primarily with the victim and katagelasticism with the bully-role (self- and peer reports). Gelotophobia correlated with laughing at oneself if experiencing an embarrassing situation. Gelotophilia increased with the propensity to laugh if observing or experiencing embarrassment; katagelasticism increased with laughing if observing something embarrassing in another person. Imagining potentially embarrassing situations was associated with greater feelings of anxiety, shame, sadness, and embarrassment; gelotophilia with joy and cheerfulness. The study breaks the ground for a better understanding on how adolescent students deal with laughter and ridicule.     

Temporal characteristics of overt attentional behavior during category learning

Many theories of category learning incorporate mechanisms for selective attention, typically implemented as attention weights that change on a trial-by-trial basis. This is because there is relatively little data on within-trial changes in attention. We used eye tracking and mouse tracking as fine-grained measures of attention in three complex visual categorization tasks to investigate temporal patterns in overt attentional behavior within individual categorization decisions. In Experiments 1 and 2, we recorded participants’ eye movements while they performed three different categorization tasks. We extended previous research by demonstrating that not only are participants less likely to fixate irrelevant features, but also, when they do, these fixations are shorter than fixations to relevant features. We also found that participants’ fixation patterns show increasingly consistent temporal patterns. Participants were faster, although no more accurate, when their fixation sequences followed a consistent temporal structure. In Experiment 3, we replicated these findings in a task where participants used mouse movements to uncover features. Overall, we showed that there are important temporal regularities in information sampling during category learning that cannot be accounted for by existing models. These can be used to supplement extant models for richer predictions of how information is attended to during the buildup to a categorization decision.     

The effect of implementation intentions on prospective memory performance across the lifespan

Differences in the amount and availability of cognitive resources may be responsible for age‐related differences in event‐based prospective memory tasks. We hypothesised that a manipulation which reduces resource requirements by enhancing automatic processing will reduce age differences. Implementation intentions are assumed to satisfy this requirement. We tested a total of 563 participants, 185 adolescents, 193 young adults and 185 older adults in order to investigate whether providing participants with implementation intention instructions would improve performance, whether any improvement would vary with age, and whether it would affect the prospective component or the retrospective component. The results showed a benefit of implementation intentions for older adults, but not for adolescents and for young adults. Separate analyses for the prospective and the retrospective components revealed that this effect was based mainly on a performance facilitation of the prospective component. These results suggest that implementation intentions provide a means to reduce age differences in prospective memory. Copyright © 2009 John Wiley & Sons, Ltd.     

Coloured Letters and Numbers (CLaN): A reliable factor-analysis based synaesthesia questionnaire

Synaesthesia is a heterogeneous phenomenon, even when considering one particular sub-type. The purpose of this study was to design a reliable and valid questionnaire for grapheme-colour synaesthesia that captures this heterogeneity. By the means of a large sample of 628 synaesthetes and a factor analysis, we created the Coloured Letters and Numbers (CLaN) questionnaire with 16 items loading on 4 different factors (i.e., localisation, automaticity/attention, deliberate use, and longitudinal changes). These factors were externally validated with tests which are widely used in the field of synaesthesia research. The questionnaire showed good test–retest reliability and construct validity (i.e., internally and externally). Our findings are discussed in the light of current theories and new ideas in synaesthesia research. More generally, the questionnaire is a useful tool which can be widely used in synaesthesia research to reveal the influence of individual differences on various performance measures and will be useful in generating new hypotheses.     

Children's Definitions of Family Power and Cohesion Affect Scores on the Family System Test

This study examines assumptions underlying the Family System Test (FAST), a figure placement tool created to measure perceptions of family members' power and cohesion. Past research with this instrument has not addressed whether participants' definitions of the constructs might influence their depiction of family structure. In this investigation participants completed the standard protocol of the FAST and a structured interview to determine their definitions of power and cohesion. Participants were then categorized and placed into groups according to classification of their definitions. Results indicated that participants' definitions significantly affected both perceived family power scores and perceived family cohesion scores.     

The Costs of Asking for Help

Research reveals that aggressive primes activate hostile information in memory. However, it is unclear whether this is true of all people or whether the activation of hostile information differs by trait aggression. In 3 studies, we investigate the organization of aggression-related knowledge. In Study 1, ratings of one's hostile emotions speeded subsequent ratings of hostile emotions, but particularly among individuals low in trait aggression. In Study 2, categorizations of blame-related words speeded categorizations of anger-related words, but particularly among individuals low in trait aggression. In Study 3, categorizations of actions as mean facilitated similar categorizations, but particularly among individuals low in trait aggression. These results suggest that aggressive primes activate hostile information in memory particularly for individuals low (rather than high) in trait aggression. The discussion of the results attempts to reconcile spreading activation processes with judgment and behavior in the particular context of trait aggression and priming effects.