ABSTRACT
The brain is involved in all of our behavior and experience. The building block of the nervous system is the nerve cell or neuron. In some ways, neurons are like other cells of the body. Neurons also have structures that enable the cell to produce energy, get rid of waste, and move materials from one part of the neuron to another. In order to detect sensory information in the environment, it is necessary to have receptors sensitive to a particular kind of energy and that the energy is of sufficient intensity to stimulate the receptors into generating electrical impulses. While emotion has been a topic of study in psychology for several decades, neuroscience has only recently begun to explore it. The mammalian brain consists of the limbic system, which adds emotion to the functions provided by the reptilian brain, and emotion helps to identify safe or unsafe behaviors.
