The Online Veterinary Anatomy Museum ("OVAM") continues to mature, expand, blossom and amaze, and now British television host (and veterinarian) Mark Evans adds his two cents to the value of this web-based resource of sharable resources with this...
Angry or happy? Dogs can tell the difference by looking at people's faces. But, do they understand what the expressions mean? Dog owners believe this to be the case, but there is no scientific proof.
Angry or Happy - For the Dogs it's like a quiz: The winner gets a treat. Mailmen and dog-owners are well aware of the fact that an angry face or friendly smile can trigger very different reactions in dogs. A team around veterinarian Corsin Andreas Müller has published a new study in "Current Biology" - describing an experiment that makes use of human facial expressions. The researchers showed that dogs are able to differentiate between two distinct human facial expressions, one being "angry" and the other being "happy".
Professor Ludwig Huber supervised the study But for the experiment it was not enough to bring an angry or happy man together with a dog, says Professor Ludwig Huber, who supervised the study and holds the chair for Comparative Cognition at the University of Veterinary Medicine in Vienna. "Dogs smell and hear very well, but their vision isn't so good. So it's possible they perceive the moods of humans not visually, but in other ways. We know, for example, that humans can also convey fear to other humans by emitting pheromones." So the scientists had to make sure the dogs participating in the experiment would not be distracted by any smells, sounds or movements. The solution: Touchscreen monitors, on which the faces would be displayed. "The dogs had to touch the screen with their snout to get a treat," Huber explains. "So the dogs had to find out, which of the facial expressions would deliver the food – and most of the dogs found that out in training."
Dogs that were trained with smiling mouths, later recognized happy or angry faces by just looking at the eyes. (photo: Clever Dog Lab Vienna) Not just smiling teeth But to make thinks more difficult, the researchers presented the dogs with a mere cross-section of the face – either the area around the eyes, or the area around the mouth. This was to make sure the dogs didn't simply learn that a smiling face with shiny white teeth– resembling a long horizontal white bar – meant food. Instead the dogs had to learn to read the entire facial expression with all its details. "We didn't just show the dogs new faces and cross-sections. They even passed the most difficult test: Dogs that were trained with the lower half of the face around the mouth were subsequently presented with the other cross section and had to differentiate between "angry" and "happy" – only by seeing the area around the eyes." In other words: The dogs had to draw conclusions about the smile just by seeing the eyes. This was only possible, because the dogs were able to imagine how the other half must have looked like. "The explanation is: Dogs that remember angry or happy human faces from their day-to-day-life fill in the missing cross-section automatically," Huber says. "They clearly draw on such memories in the tests. So they must be capable of distinguishing between faces and facial expressions."
Dr. Andreas Corsin Müller - lead author of the study Do dogs understand the meaning of a smile? But one big question remains: Do our four-legged friends only distinguish the two, or do they also understand what the expressions actually mean on an emotional level? The experiment was not conclusive on this count, but some observations of the scientists suggest that dogs do understand more than meets the eye: Dogs that were tasked with touching the "happy" faces were much less hesitant to do so. "It took us almost three times as long, to train the other group of dogs to make contact with the 'angry' ones," Huber recalls. "The task for both groups was essentially the same, but the dogs were reticent to touch the angry face on the touchscreen – and that suggests that they are capable of perceiving emotions and interpreting them." And if you ever lived together with a dog – you would probably not doubt that.
RTBF Ma thèse de doctorat expliquée en 180 secondes RTBF Mais l'idée c'est vraiment de rendre ça abordable à un quidam, à n'importe qui qui n'aurait jamais entendu parler des neurosciences, qui ne connaît pas l'IRM ou les techniques de rééducation,...
Le monde du design et de la réalité augmentée vit aujourd'hui une petite révolution ! Des chercheurs ont mis au point un prototype époustouflant : une tablette capable de matérialiser en trois dimensions le croquis que vous êtes en train de réaliser, et cela en temps réel ! DGS vous explique le fonctionnement de cet outil stupéfiant.
Gravity est un concept développé par une équipe de 4 ingénieurs du Royal College of Art à Londres. Cette tablette permet à ses utilisateurs, équipés de lunettes à réalité augmentée, de voir leur création prendre forme en 3 dimensions, comme si l'image était projetée par hologramme. Des réglages permettent même de faire pivoter le croquis sous tous les angles pour mieux l'observer et continuer à le dessiner.
Les concepteurs de cet objet novateur ont déposé un brevet pour protéger leur invention et ils travaillent actuellement à l'élaboration d'une version pouvant être commercialisée. Gravity ne nécessite aucun ordinateur ; simplement une tablette, le stylet vendu avec le produit et des lunettes à réalité augmentée, peu importe leur type. Il n'est cependant pas possible de relier le dispositif à un écran, qui affichera vos créations, sans que vous n'ayez besoin de vous équiper de lunettes.
Le principe de Gravity nous a vraiment subjugués. Nous souhaitons vivement que les créateurs de cette tablette révolutionnaire développent un appareil accessible à tous. Tout comme les concepteurs, nous sommes tous persuadés que la réalisation de croquis en réalité augmentée pourra être utile dans l'industrie, la recherche, l'art et bien d'autres domaines également. Pensez-vous que la réalité augmentée finira par faire entièrement partie de notre quotidien ?
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