Prologue.- Basic mechanisms in sensory systems.- Introductory remarks.- Stephan Frings, Sensory cells and sensory organs.- Geoffrey A. Manley, Vertebrate hearing: origin, evolution and functions.- Kristine Krug, Principles of function in the visual system.- Wolf Singer, What binds it all together? Synchronized oscillatory activity in normal and patho-logical cognition.- Evolutionary epistemology.- Introductory remarks.- Gerhard Vollmer, Between biology and philosophy: our knowledge of the real world.- Friedrich G. Barth, Sensory perception: adaptation to lifestyle and habitat.- Martin Giurfa, Visual learning in social insects: from simple associations to higher-order problem solving.- Ludwig Huber and Anna Wilkinson, Evolution of cognition: a comparative approach.- Perception, art, and illusion.- Introductory remarks.- Christoph v. Campenhausen and Jürgen Schramme, Understanding color vision, with comments on mind and matter.- Richard L. Gregory , Pictures as strange objects of perception.- René Weissensteiner, Thomas Steinkellner, Andreas Jurik, Simon Bulling, Walter Sandtner, Oliver Kudlacek, Michael Freissmuth, Gerhard F. Ecker and Harald H. Sitte, Towards an understanding of the psychostimulant action of amphetamine and Cocaine.- Daniel Bowling and Dale Purves, A biological basis for musical.- Johannes Deutsch, Synaesthesia and synergy in art. Gustav Mahler\'s \"Symphony No. 2 in C minor\" as an example of interactive music visualization.- Perception and memory: conscious and unconscious processes.- Introductory remarks.- Patrizia Giampieri-Deutsch, Perception, conscious and unconscious processes.- Howard Shevrin, Consciousness, states of consciousness, unconscious psychological processes, and psychological states.- Matthew Hugh Erdelyi, Explicit and implicit memory.- The history of sensory worlds.- Introductory remarks.- John Gage, Colour ordered and disordered.- Robert Jütte, The sense of smell in historical perspective.- Neurophilosophy and free will.- Introductory remarks.- Gerhard Roth, Neurophilosophy.- Ernst Steinkellner, Sensory perception, body and mind in Indian Buddhist philosophy.- Sybille Krämer, The \'eye of the mind\' and the \'eye of the body\': Descartes and Leibniz on truth, mathematics, and visuality.- Hans-Dieter Klein, Free will.- Index.- List of contributors.- The editors.