This book arrays recent research on the neural and behavioural lateralization of the brain relying heavily on animal modes. The authors employ the comparative method to enhance our understanding of behaviour, specifically through hand use and "handedness" by drawing comparisons with studies involving primates. Topics discussed include patterns of lateralized behaviour in prosimians; behavioural lateralization in language-trained chimpanzees; patterns of handedness - comparative study of nursery school children and captive gorillas; and rotational behaviour in children and adults. It is the first book of its kind devoted entirely to the question of behavioural asymmetries in all primates and thus presents a milestone as it recognizes the accumulating evidence of asymmetry and lateralized behaviour in the non-human nervous system.