Screen-based media, such as touch-screens, navigation systems and virtual reality applications merge images and operations. They turn viewing first and foremost into using and reflect the turn towards an active role of the image in guiding a user’s action and perception. From professional environments to everyday life multiple configurations of screens organise working routines, structure interaction, and situate users in space both within and beyond the boundaries of the screen. This volume examines the linking of screen, space, and operation in fields such as remote navigation, architecture, medicine, interface design, and film production asking how the interaction with and through screens structures their users’ action and perception.

This book represents a unique and elaborate exposition of the neural organization of language, memory, and spatial perception in a wide variety of species including humans, bees, fish, rodents, and monkeys. The editors have united the comparative approach with its emphasis on evolutionary determinants of behavior, the neurobiological approach with its emphasis on the neural determinants of behavior, and the cognitive approach with its emphasis on understanding higher-order mental functions. The combination of these three approaches provides an unusual look at the neurobiology of comparative cognition, and should stimulate increased investigations in this field and related disciplines.

A survey of current knowledge about Hamiltonian systems with three or more degrees of freedom and related topics. The Hamiltonian systems appearing in most of the applications are non-integrable. Hence methods to prove non-integrability results are presented and the different meaning attributed to non-integrability are discussed. For systems near an integrable one, it can be shown that, under suitable conditions, some parts of the integrable structure, most of the invariant tori, survive. Many of the papers discuss near-integrable systems. From a topological point of view, some singularities must appear in different problems, either caustics, geodesics, moving wavefronts, etc. This is also related to singularities in the projections of invariant objects, and can be used as a signature of these objects. Hyperbolic dynamics appear as a source on unpredictable behaviour and several mechanisms of hyperbolicity are presented. The destruction of tori leads to Aubrey-Mather objects, and this is touched on for a related class of systems. Examples without periodic orbits are constructed, against a classical conjecture. Other topics concern higher dimensional systems, either finite (networks and localised vibrations on them) or infinite, like the quasiperiodic Schrödinger operator or nonlinear hyperbolic PDE displaying quasiperiodic solutions. Most of the applications presented concern celestial mechanics problems, like the asteroid problem, the design of spacecraft orbits, and methods to compute periodic solutions.

This volume is the outcome of a Symposium held in Lyon, France. The meeting was organized under the auspices of the Institut National de la Sante et de la Recherche Medicale (INSERM, Paris). We are grateful to the Universite Claude-Bernard which allowed us to use the house of the Brothers Lumiere for the site of the meeting. We would also like to acknowledge the generosity of the Fondation Merieux (Lyon) which pro vided us with a reception at the house where Claude Bernard was born. In addition to the authors ofthis volume we wish to thank the following individuals for their contributions to the success ofthe Symposium: Chris tine Baleydier, Simon Faugier-Grimaud, Francoise Girardet, Jacqueline Jeannerod, Henry Kennedy, Michele Magnin, Claude Prablanc, Kath erine Page, Lawrence Stark and Francois Vital-Durand. Support from the Office of Naval Research (Contract # N00014-80-K- 0243), the National Eye Institute (Grant # 1 P30-EY02621), the Institut National de la Sante et de la Recherche Medicale (Paris) and Sherin Stahl, a participant in the Undergraduate Research Opportunities Program of the Massachusetts Institute of Technology made this volume possible."