The nature of behavioural lateralization in the chick

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Abstract
Evidence suggests lateralization for two major modes of analysis of a stimulus or experience, which must be carried out simultaneously by an animal capable of complex behaviour. This chapter presents evidence which suggests that the right and left visual systems can interact in the chick in a variety of ways when assessing and responding to a stimulus. Such interaction is basic to the functioning of lateralized systems. There is increasing evidence for marked asymmetry in the processes of memory formation in the chick. The chapter studies the chick as a model system to study basic properties of laterlization under three heads – motor behaviour, emotional behaviour, and cognitive processes and attention – and argues that these three are likely to be widely present in the higher vertebrates as well. Finally, it discusses hemispheric interaction to study memory formation and the development of learning abilities.

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