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International audience; Since early ergonomics, notations have been created focusing on the activities, jobs and task descriptions. However, the development of a wide variety of devices led to the generation of different interfaces from the same description of the tasks. The generation of complete current interfaces needs different types of information, some of which are not represented in usual task models. The goal of this paper is to present information that seems to be lacking in the task models.

We present our current research on the implementation of gaze as an efficient and usable pointing modality supplementary to speech, for interacting with augmented objects in our daily environment or large displays, especially immersive virtual reality environments, such as reality centres and caves. We are also addressing issues relating to the use of gaze as the main interaction input modality. We have designed and developed two operational user interfaces: one for providing motor-disabled users with easy gaze-based access to map applications and graphical software; the other for iteratively testing and improving the usability of gaze-contingent displays., Comment: 10 pages

ISBN 3-540-28943-7; International audience; We report an experimental study that aims at investigating the influence of spatial layout on visual search efficiency and comfort. 4 layouts were used for displaying 120 scenes comprising 30 realistic colour photos each: random, elliptic, radial and matrix-like. Scenes (30 per structure) were presented to 5 participants who had to select a pre-viewed photo in each scene using the mouse. Eye-tracking data indicate that elliptic layouts provided better visual comfort than any of the other layouts (shortest scan paths), and proved to be more efficient than matrix layouts (shortest search times). These results are statistically significant (paired t-tests).

A tube wave is the lowest order mode propagating in a fluid-filled borehole. It is the only one without a cut-off frequency and is similar to the Stoneley interface wave. It has been studied, for instance by WHITE [1] in the case of a circular cylinder.