This page was born Fall 98 semester. The zygote develops into the embryo. Our page started as a simple idea and is developing into an indepth overview of a number of major theoretical perspectives. Just as you grew from an embryo to a fetus, a fetus to a neonate, and a neonate to an infant, our page will grow. It's now in the infancy stage, and like infants, will experience rapid growth.
Infants grow to three times their birth weight by their first birthday.
Let's get started with some basic information about the discipline and theories, because like an infant, we must crawl before we can walk. Psychology is the scientific study of behavior and mental processes. For example, psychology studies the brain, sensation and perception, motivation, intelligence, emotions, memory, psychological disorders, and much more. It's focus is on studying the changes that take place across our life span. Development is defined as changes in our physical structure, thought, and behvior due to genetics or the environment.