emotions are a primary source of motivation as we seek objects and activities that makes us feel good and avoid doing or saying things that make us feel bad. sometimes our emotions can overwhelm us, as when we become stressed by demands on our time. decisions and judgments are affected by how people feel; emotions are cognition which are completely intertwined. emotions: are immediate responses to environment events such as being cut off in traffic. It is useful to distinguish emotion from mood. mood: are diffuse and long-lasting emotional states that influence rather than interrupt thought and behavior. Mood reflects people"s perceptions of whether they have the personal resources necessary to meet environmental demands. as people become to be overwhelmed they become stressed: a pattern of behavioral and physiological responses to events that match or exceed an organisms" abilities. negative and positive experiences guide behavior that increases the probability of surviving and reproducing.