摘要: This chapter examines the ontogeny of motivated behavior, particularly origins early attractions. It focuses on biological foundations preferences in an animal model, laboratory rat. A developmental approach is utilized to examine appearance over different behavioral tendencies and how they change. can reveal components motivation as appear (at ontogenetic times) allow examination physiological substrate (hormonal, neural, etc.) these developing separately. also specify experience contributes motivational change by building states that are, definition, rewarding newborns. These states, concerned with energy conservation stimulation central nervous system (CNS) for brain growth development, will be discussed position advanced here intrinsically systems supported.