Nonverbal Encouragement of Participation in a Course: the Effect of Touching

Previous studies have shown that touching leads to positive behavior, particularly in an educational context. A new experiment was carried out in which students were encouraged to intervene in a course by demonstrating the solution of a statistical exercise on the blackboard. According to the experiment, students were or were not briefly touched on the forearm by the teacher during the corrective exercise. After that, the teacher asked his students to demonstrate the exercise on the blackboard. The results showed that touching increases the volunteers’ rate. Various explanations (familiarity, status and mood) were suggested to explain such results. This revised version was published online in August 2006 with corrections to the Cover Date.     

Towards refinement of abductive or inductive hypotheses through propagation

In this paper we address the problem of distributed sources of information, or agents, that observe the environment locally and have to communicate in order to refine their hypothesis regarding the actual state of this environment. One way to address the problem would be to centralize all the collected observations and knowledge, and to centrally compute the resulting theory. In many situations however, it would not be possible to adopt this centralized approach (e.g. for practical reasons, or privacy concerns). In this paper, we assume that agents individually face abductive or inductive tasks in a globally coherent environment, and we show that general mechanisms can be designed that abstractly regard both cases as special instances of a problem of hypothesis refinement through propagation. Assuming that agents are equipped with some individual revision machinery, our concern will be to investigate how (under what conditions) convergence to a consistent state can be guaranteed at more global levels: (i) between two agents; (ii) in a clique of agents; and (iii) in general in a connected society of agents.     

Effect of fatigue on double pole kinematics in sprint cross-country skiing

The aim of the present study was to examine the effect of fatigue (physiological, mechanical, and muscular parameters) induced by a sprint simulation on kinematic parameters (cycle, phases, and joints angles) of the double pole technique. Eight elite skiers were tested for knee extensor strength and upper body power both before and after a three-bout simulation of sprint racing. They were video analyzed during the final part of the test track of bouts 1 and 3 using a digital camera. Results showed that skiers were in a fatigue state (decrease of the knee extensors voluntary force (-10.4+/-10.4%) and upper body power output (-11.1+/-8.7%) at the end of the sprint. During bout 3, the final spurt and cycle velocities decreased significantly (-7.5+/-12.3%; -13.2+/-9.5%; both p<.05). Angular patterns were only slightly modified between bouts 1 and 3 with trunk, hip, and pole angles being significantly greater for the third bout. The decrease of hip and trunk flexion and the lower inclination of the pole during the poling phase suggested a reduced effectiveness of the force application which could lead to a decrease in the cycle velocity.     

Attentional and anatomical considerations for the representation of simple stimuli in visual short-term memory: evidence from human electrophysiology

Observers encoded the spatial arrangement of two or three horizontal line segments relative to a square frame presented for 150 ms either in left or right visual field and either above or below the horizontal midline. The target pattern was selected on the basis of colour (red vs. green) from an equivalent distractor pattern in the opposite left–right visual hemifield. After a retention interval of 450 or 650 ms a test pattern was presented at fixation. The task was to decide whether the test was the same as the encoded pattern or different. Selection of the to-be-memorised pattern produced an N2pc response that was not influenced by the number of line segments nor by the length of the retention interval, but that was smaller in amplitude for patterns presented in the upper visual field compared with patterns presented in the lower visual field. A sustained posterior contralateral negativity (SPCN) followed the N2pc. The SPCN was larger for patterns with three line segments than for two, was larger for patterns encoded from lower visual field than from upper visual field, and returned to baseline sooner for the shorter retention interval than for the longer interval. These results, and others, provide an interesting and complex pattern of similarities and differences between the N2pc and SPCN, consistent with the view that N2pc reflects mechanisms of attentional selection whereas the SPCN reflects maintenance in visual short-term memory.     

Influence of proficiency level and constraints on viewpoint switching: a study in web design

Web design is a complex problem in which designers have to consider the user's and the client's viewpoints to make satisfactory websites. Designers, particularly proficient ones, tend to privilege to the client's viewpoint to the detriment of the users' one. Consequently, websites often contain many usability violations and do not fit users' cognitive capacities, hence hampering navigation. The usability quality of websites may be proportional to designers' ability to switch between the client's and the user's viewpoints, which in turn may be influenced by designers' proficiency level. To explore the role of viewpoint switching in web design, performance was compared across three conditions emphasizing either the client's viewpoint, that of the user, or none of them in order to promote or hamper viewpoint switching. This manipulation had a significant effect on proficient designers' performance. Moreover, a significant relation between viewpoint switching and the usability quality of e‐mock‐ups was found. Copyright © 2008 John Wiley & Sons, Ltd.     

When the grass on the other side of the fence doesn't matter: Reciprocal romantic interest neutralizes attentional bias towards attractive alternatives

Attention is automatically captured by pictures of physically attractive faces. Although helpful for mate detection, a chronic attentional bias towards attractive opposite-sex faces interferes with relationship initiation because it detracts from the current choice. Therefore, we hypothesized that an orienting of attention to attractive opposite-sex faces is inhibited as soon as a potential mating partner reciprocates one's romantic feelings. Results of two experiments supported this idea: In a first study, imagining that an attractive person shows signs of reciprocal romantic interest eliminated automatic attentional capture by attractive opposite-sex faces. Similar results were obtained in a second study that analyzed intra-individual change in attentional biases during a longitudinal dating study. Results provide evidence for the role of automatic regulatory processes in relationship initiation and can be incorporated into more general models of (implicit) self-regulation.     

Validation d’une Échelle de Frustration des Besoins Psychologiques au Travail (EFBPT)

The purpose of the three present studies was to adapt in French in the work context a questionnaire developed by Bartholomew, Ntoumanis, Ryan, and Thøgersen- Ntoumani (2011) designed to assess thwarting of the needs for competence, autonomy, and relatedness. Exploratory (Study 1) and confirmatory analyses (Study were conducted among French workers. These studies demonstrated an acceptable internal consistency and confirmed the three-factor structure of the questionnaire (i.e., EFBPT). In addition, the construct validity of the scale was also corroborated in Study 3.     

Post-training cyclooxygenase-2 (COX-2) inhibition impairs memory consolidation

Evidence indicates that prostanoids, such as prostaglandins, play a regulatory role in several forms of neural plasticity, including long-term potentiation, a cellular model for certain forms of learning and memory. In these experiments, the significance of the COX isoforms cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2) in post-training memory processes was assessed. Adult male Long-Evans rats underwent an eight-trial (30-sec intertrial interval) training session on a hippocampus-dependent (hidden platform) or dorsal striatal–dependent (visible platform) tasks in a water maze. After the completion of training, rats received an intraperitoneal injection of the nonselective COX inhibitor indomethacin, the COX-1–specific inhibitor piroxicam, the COX-2–specific inhibitor N-[2-cyclohexyloxy-4-nitrophenyl]-methanesulfonamide (NS-398), vehicle (45% 2-hydroxypropyl-β-cyclodextrin in distilled water), or saline. On a two-trial retention test session 24 h later, latency to mount the escape platform was used as a measure of memory. In the hidden platform task, the retention test escape latencies of rats administered indomethacin (5 and 10 mg/kg) or NS-398 (2 and 5 mg/kg) were significantly higher than those of vehicle-treated rats, indicating an impairment in retention. Injections of indomethacin or NS-398 that were delayed 2 h post-training had no effect on retention. Post-training indomethacin or NS-398 had no influence on retention of the visible platform version of the water maze at any of the doses administered. Furthermore, selective inhibition of COX-1 via post-training piroxicam administration had no effect on retention of either task. These findings indicate that COX-2 is a required biochemical component mediating the consolidation of hippocampal-dependent memory.     

Neural computation as a tool to differentiate perceptual from emotional processes: The case of anger superiority effect

Research findings in social and cognitive psychology imply that it is easier to detect angry faces than happy faces in a crowd of neutral faces [Hansen, C. H., & Hansen, R. D. (1988). Finding the face in the crowd – An anger superiority effect. Journal of Personality and Social Psychology, 54(6), 917–924]. This phenomenon has been held to have evolved over phylogenetic development because it was adaptive to quickly and accurately detect a potential threat in the environment. However, across recent studies, a controversy has emerged about the underlying perceptual versus emotional factors responsible for this so-called anger superiority effect [Juth, P., Lundqvist, D., Karlsson, A., & Ohman, A. (2005). Looking for foes and friends: Perceptual and emotional factors when finding a face in the crowd. Emotion, 5(4), 379–395; Purcell, D. G., Stewart, A. L., & Skov, R. B. (1996). It takes a confounded face to pop out of a crowd. Perception, 25(9), 1091–1108]. To tease apart emotional and perceptual processes, we used neural network analyzes of human faces in two different simulations. Results show that a perceptual bias is probably acting against faster and more accurate identification of anger faces compared to happy faces at a purely perceptual level. We suggest that a parsimonious hypothesis related to the simple perceptual properties of the stimuli might explain these behavioral results without reference to evolutionary processes. We discuss the importance of statistical or connectionist analysis for empirical studies that seek to isolate perceptual from emotional factors, but also learned vs. innate factors in the processing of facial expression of emotion.