Normally, the body is able to keep the sinuses clean and healthy, despite the dark, moist environment that bacteria love. However, when conditions are right, bacteria can grow out of control in the sinuses, causing a sinus infection. One cause of sinus infections is the common cold.
It has been established that there are two major patterns of human behavior that reflect two modes of brain operation: 1  Survival-Oriented Behavior (SOB). Controlled by primitive areas in the middle of the brain.  Balanced-Empathic Behavior (BEB) .
Detailed in the literature are two types of goal orientations. The first is a mastery goal, where students focus on mastery of a task and have the desire to acquire new skills. The second is a performance goal, where learnersâ main concern is demonstrating competence and focus on receiving favorable judgments of ability from others.