Dr. Yuri Robbers is an ethologist researching social systems, time structure and theoretical ethology. He is currently employed as a teacher at the Stedelijk Gymnasium Leiden,.amd as a researcher at Liden University.
2005 0-7734-6201-5 Michael Chance created the concept of two modes of social interaction, agonic and hedonic. The one based upon threat, power and anxiety; the other on playful catching of attention and prestige. Whereas the rhesus macaque’s social system in mainly agonic, chimpanzees are capable of hedonic social relationships. The book has been written by two biologists who both have a broad interest in human behavior and the social sciences. They have favoured a non-specialist style, so as to make the book readable by educated laymen and graduate students as well as scientists working in the biological, psychological and sociological disciplines.