1 MARKUS RAAB 1 , 2 , JÜRGEN PERL 3 AND DIRK ZECHNALL 45 The Mapping of Intrinsic and Extrinsic Information in Continuous Visuo-Motor Control Humans rely on eye-hand coordination in daily life. The term “visuo-motor mapping” describes the interaction between visual and motor processes, which determine the performance in eye-hand coordination problems. However, different concepts exist regarding what this interaction entails and how it is defined. For instance recent research by Rosenbaum and Chaiken (2001) demonstrated very fine motor control in a manual positioning task depends on extrinsic (spatial coordinates) and intrinsic (postural or body movements) information. The underlying representation of this extrinsic and spatial representation is defined in “world-based” coordinates, that is, x and y coordinates in the case of two-dimensional movements (see Carrozzo, McIntyre, Zago, & Lacquaniti, 1999, for detailed descriptions of different “world- based” representations). The reference frame coding bodily movements is defined as the intrinsic information. The goal of our study is to test different models (see Rosenbaum & Chaiken, 2001, for an overview) that differ in the way how extrinsic and intrinsic information are mapped to enable precise motor control. To pursue our goal we use four models to generate different predictions for our study and evaluate these with our experimental and simulation results. This goal is motivated by recent research that demonstrated encoding of extrinsic as well as intrinsic information with at least four potential models of motor control on behavioral level and for discrete movements only (Rosenbaum & Chaiken, 2001). That extrinsic and extrinsic information can coexist and interact is supported by behavioral and physiological experiments. For instance, psychophysical experiments confirm that two representations of space can coexist and can be modeled with 1 Center for Adaptive Behavior and Cognition, Max Planck Institute for Human Development, Berlin, Germany 2 Institute for Human Movement and Sport, University of Flensburg, Germany 3 Institute for Computer Science, University of Mainz, Germany 4 Institute for Sport and Sport Sciences, University of Heidelberg, Germany 5 Date of resubmission: 12 th of August 2003 Authors note: The study was supported by a grant from TransCoop (III-TCFO-DEU/1023836) and the research pool of the University of Heidelberg. Correspondence regarding this article should be sent to the first author, Markus Raab now at University of Flensburg, Institute of Movement Science and Sport, Flensburg, Germany (raab@uni-flensburg.de). The authors are grateful to Christel Fraser, Joe Johnson, and Anita Todd for their assistance with the English version.