According to biological theories, development happens based on a biological timeline. Two sub-theories within the biological theories: maturation theory: child development reflects a specific plan within the body, ethological theory: clinging to mothers, crying). believe that many behaviours are adaptive (i. e. babies. Imprinting: moving object forming an emotional bond between the child and the first. Critical period: the time frame in which a child is ready to learn. Development is based on how a child resolves conflict in different ages. Erikson"s psychosocial development theory: that development could continue into adulthood. Also proposed that earlier stages of same concept as freud, but proposed development provide the foundation for the later stages. Erickson also provided the idea that conflicts can be social, not just biological. Expresses the importance of experience, environmental factors, and reinforcement and imitation. Classical conditioning: pairing a stimuli to a response; i. e. little albert (paired a white rat with loud noise that scared infant.