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164 Socially Intelligent Agentsplies that joint attention and action capture intertwine with each other, playingimportant roles in infants’ development of social communication. Therefore,we have implemented in Infanoid the primordial capability of joint attentionand are working on that of action capture.Social intelligence has to have an ontogenetic history that is similar to thatof humans and is open to further adaptation to the social environment; it alsohas to have a naturalistic embodiment in order to experience the environmentin a way that is similar to humans’. Our ongoing attempt to foster Infanoidwill tell us the prerequisites (nature) for and developmental process (nurture)of the artificial social beings that we can relate to.Notes1. Joint attention requires not only focusing on the same object, but also mutual acknowledgementof this sharing action. We assume that joint attention before “nine-month revolution” [9] is reflexive—therefore, without this mutual acknowledgement.References[1] S. Baron-Cohen. Mindblindness: An Essay on Autism and Theory of Mind. MIT Press,Cambridge, MA, 1995.[2] S. Baron-Cohen. Is there a normal phase of synaesthesia in development? Psyche, 2(27),1996. http://psyche.cs.monash.edu.au/v2/psyche-2-27-baron cohen.html.[3] R.A. Brooks, C. Breazeal, M. Marjanovic, B. Scassellati, and M. Williamson. The Cogproject: building a humanoid robot. In C.L. Nehaniv, editor, Computation for Metaphors,Analogy and Agents, Lecture Notes in Computer Science, Vol. 1562, pages 52–87.Springer-Verlag, Berlin, 1998.[4] R. Byrne. The Thinking Ape: Evolutionary Origins of Intelligence. Oxford UniversityPress, 1995.[5] D.C. Dennett. The Intentional Stance. MIT Press, Cambridge, MA, 1987.[6] A. Meltzoff and M.K. Moore. Persons and representation: why infant imitation is importantfor theories of human development. In J. Nadel and G. Butterworth, editors, Imitationin Infancy, pages 9–35. Cambridge University Press, 1999.[7] G. Rizzolatti and M.A. Arbib. Language within our grasp. Trends in Neuroscience, 21:188–194, 1998.[8] D. Sperber and D. Wilson. Relevance: Communication and Cognition. Harvard UniversityPress, Cambridge, MA, 1986.[9] M. Tomasello. The Cultural Origins of Human Cognition. Harvard University Press,Cambridge, MA, 1999.[10] J. Zlatev. The epigenesis of meaning in human beings, and possibly in robots. Minds andMachines, 11: 155–195, 2001.