Background: This study developed a photo and video database of 4-to-6-year-olds expressing the seven induced and posed universal emotions and a neutral expression. Children participated in photo and video sessions designed to elicit the emotions, and the resulting images were further assessed by independent judges in two rounds. Methods: In the first round, two independent judges, experts in the Facial Action Coding System, firstly analysed 3,668 emotions facial expressions stimuli from 132 children. Both judges reached 100% agreement regarding 1,985 stimuli, (...) which were then selected for a second round of analysis between judges 3 and 4. Results: The result was 1,985 stimuli were produced from 124 participants. A Kappa index of 0.70 and an accuracy of 73% between experts were observed. Lower accuracy was found for emotional expression by 4-year-olds than 6-year-olds. Happiness, disgust and contempt had the highest agreement. After a sub-analysis evaluation of all four judges, 100% agreement was reached for 1,381 stimuli which compound the ChildEFES database with 124 participants and 51% induced photographs. The number of stimuli of each emotion were: 87 for neutrality, 363 for happiness, 170 for disgust, 104 for surprise, 152 for fear, 144 for sadness, 157 for anger 157, and 183 for contempt. Conclusions: The findings show that this photo and video database can facilitate research on the mechanisms involved in early childhood recognition of facial emotions in children, contributing to the understanding of facial emotion recognition deficits which characterise several neurodevelopmental and psychiatric disorders. (shrink)

L’étude d’un document épigraphique antinoïte, jusqu’ici négligé, suggère que le géomètre Serenus, auteur de deux traités "Sur la section du cylindre" et "Sur la section du cône", vivait au début du IIIe siècle. Le réexamen plus précis d’un certain nombre d’éléments tirés tant des traités de Serenus que de la tradition indirecte permet de faire de celui-ci le continuateur tardif d’une tradition de recherches sur les coniques très liée à la catoptrique, remontant aux travaux pré-apolloniens sur la question menés autour (...) de Conon de Samos et de Pythion de Thasos. Cette hypothèse pose, corrélativement, le problème de la nature du platonisme de Serenus: on l’examine à la lumière du constructivisme de Ménechme. Enfin, la prise en compte d’un détail de la tradition arabe des "Coniques" d’Apollonius permet de préciser un élément dans la transmission textuelle des deux traités de Serenus. (shrink)