Depth Affects Where We Look

SummaryUnderstanding how we spontaneously scan the visual world through eye movements is crucial for characterizing both the strategies and inputs of vision [1–27]. Despite the importance of the third or depth dimension for perception and action, little is known about how the specifically three-dimensional aspects of scenes affect looking behavior. Here we show that three-dimensional surface orientation has a surprisingly large effect on spontaneous exploration, and we demonstrate that a simple rule predicts eye movements given surface orientation in three dimensions: saccades tend to follow surface depth gradients. The rule proves to be quite robust: it generalizes across depth cues, holds in the presence or absence of a task, and applies to more complex three-dimensional objects. These results not only lead to a more accurate understanding of visuo-motor strategies, but also suggest a possible new oculomotor technique for studying three-dimensional vision from a variety of depth cues in subjects—such as animals or human infants—that cannot explicitly report their perceptions

Multimodal Fusion in Self-Motion Perception using Wavelets and Quaternions

ISBN : 978-2-9532965-0-1In this new model of self-motion perception we focused on two main questions that are central in this field. The first one is how this central nervous system (CNS) merges information coming from different sensory modalities (as vision, touch, vestibular system,...). Another important question is how the system uses translation and rotation information properly to give a correct estimation of motion in three dimensions. These two questions have many ramifications like gravito-inertial force problem or the explanation of the non-linearity of multimodal fusion. We propose that the multimodal fusion is realized in the time/frequency space. In addition, we propose that the CNS uses a population of quaternion-like cells to process rotational and translational information. This model can be considered as a general framework based as much on theoretical concerns as on experimental results of different studies

Perception du mouvement propre chez l'homme (application à l'automobile)

Le thème de cette thèse est l'étude de la perception du mouvement propre chez l'Homme. Nous avons cherché à extraire des connaissances sur la perception du mouvement propre qui puissent s'exprimer sous forme de modèles mathématiques. Notre orientation initiale a été de trouver des moyens objectifs pour l'étude de l'accélération linéaire. C'est pourquoi nous nous sommes orientés vers la détermination des seuils de perception à l'aide du cadre théorique de la psychophysique. Les seuils absolus de perception de l'accélération linéaire étant connus, nous avons réalisé des expériences nous permettant de déterminer les seuils différentiels de perception de l'accélération linéaire chez l'Homme grâce à un robot mobile. Nous avons ensuite développé un modèle mathématique de perception du mouvement propre basé sur notre étude expérimentale ainsi que sur l'état de l'art du domaine. Une des originalités de ce modèle est la prise en compte de l'anticipation dans la désambiguïsation de la perception.PARIS-BIUSJ-Thèses (751052125) / SudocPARIS-BIUSJ-Physique recherche (751052113) / SudocSudocFranceF

Virtual reality backend for operator controlled nanomanipulation

Best Paper NomineeInternational audienc

Virtual reality backend for operator controlled nanomanipulation

Best Paper NomineeInternational audienc