Development of lateralization
Behavioural functions lateralized to one hemisphere predominate at one age and those of the other hemisphere at another. At another stage in the developmental plan, both sides of the brain may be equally involved in controlling the behaviour, even though each play a different role. The shifts in laterality of function correlate with changes in cellular function that occur first on one side of the brain and then on the other. Although the data is, as yet, scanty, it is suggested that while very young females have lateralization of visual learning, older females have no lateralization of this brain function. Function lateralities between the eyes are also present for attack and copulation. Lateralization for the control of agnostic behaviour has been found in adult fowls. The direction of laterlization in the chicken brain is determined by light exposure of the embryo prior to hatching, in both males and females.
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