People never take in the world as it is (Martin, Carlosn, & Buskist, 2007). There are certain events that they ignore over those which attract their attention and control their awareness. Most of the times, people do not realize that selective attention takes place in their daily routines and how it occurs. Selective attention therefore, is the process where living organisms find an object, a person or an event to concentrate upon over another. Selective attention sets out what events people become conscious of (Martin et al., 2007). Selective attention is thought to be controlled by several ways. Some theories show that it can be controlled automatically, like when a sudden, loud sound captures one’s attention and tries to find out what it was. Others believe that it may be controlled by instructions; for example school teachers used to shout to their students to pay attention to the lesson or they would fail the test. Also demands of a particular task, people perform, can take over their attention as when driving a car; the drivers have to keep their alertness for other drivers, road signs and so on (Martin et al., 2007). The example above belongs to divided attention (like cooking) where a person performs tasks which require their attention on more than one stimulus which in the end performance on stimuli diminishes. Posner and Peterson (1990) illustrated the ability to alter attention in three different ways (Martin et al., 2007). First, the posterior parietal cortex is responsible for withdrawing attention from a current location while the thalamus enables prosecution of attention to a new location. For the guiding of attention from a current location to a new one, different structures take part to make it occur (superior colliculus and the frontal eye fields). Different classes of noise affect current cognitive activity differently. For example, when someone is stressed to get an essay done by the due date then, the music coming from the room next door will not distract one’s attention. On the other hand though, background noise in an office can increase stress on employees and decrease levels of performance, efficiency