Genes interact with the environment, experience, and biology of the brain to shape an animal’s behavior. This latest volume in _Advances in Genetics,_ organized according to the most widely used model organisms, describes the latest genetic discoveries in relation to neural circuit development and activity. * Explores the latest topics in neural circuits and behavior research in zebrafish, drosophila, C.elegans, and mouse models * Includes methods for testing with ethical, legal, and social implications * Critically analyzes future prospects