The very nature of the "nature versus nurture" issue can be explored through the use of embryonic neural transplants between two bird species, demonstrating that a congenital auditory preference resides in the nervous system and is transferable. The transfer of the auditory preference does not influence the vocalizations of the resulting animals (called chimeras), suggesting that auditory self-stimulation is not an explanation for the behavioral change. Such information allows researchers insight into how behaviors might be hard-wired in an organism and how genetic and environmental factors might influence their development and emergence.
In studying the nature of inborn behaviors, one may explore the ability of the developing brain to organize specific and complex behaviors. Research demonstrates that certain inborn behaviors are wired early in development, restricted to relatively small regions of the brain, and can be transplanted to another species.
If inborn behaviors do not seem to have a strong learned component, one might expect a distinct brain locus that controls the phenotype. Correspondingly, different variants of the same behavior, either within species or across species, should be reflected in differences in that brain region.
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