(DSS), fails to detect the item in one field. It is thus believed that extinction is caused by sensory neglect, and that extinction reflects an attentional deficit rather than a contralesional deficit in primary perceptual processing. In visual extinction this attentional deficit in perception applies mainly to attention in the relevant dimension. Visual extinction is greatest when objects either have the same color or the same shape. Studies suggest that brain damage to the parietal lobe causes sensory neglect and that in turn causes extinction. Spatial neglect specifically leads to visual extinction. Neglect often follows right inferior parietal damage, and is characterized by impaired attention and lack of awareness for stimuli on the contralesional (left) side of space. Any kind of brain damage can lead to neglect, things like stroke, brain tissue death, or tumors, and cause the unilateral damage to one side of the parietal lobe. Overall a person with parietal brain damage still has intact visual fields. One way to reduce the effects of extinction is to use grouping of items. Brightness and edge based grouping reduces visual extinction and they act in an additive way. Grouping with similar shapes also reduces the effects of extinction. This suggests that the attentional deficit in extinction can be compensated, at least in part, by the brain's object recognition systems. While the parietal lobe deals with sensation and perception, the amygdala controls the perception of fear and emotion. This means that by utilizing the perception abilities of the amygdala that emotional properties of contralesional stimuli can be extracted despite pathological inattention and unawareness. This is because the ability of the amygdala to perceive fear is autonomous and without conscious effort and attention. Unfortunately studies have shown that perception of fear can become habituated so it can be unreliable to reduce extinction by use of the amygdala. Auditory extinction Auditory extinction is the failure to hear simultaneous stimuli on the left and right sides. This extinction is also caused by brain damage on one side of the brain where awareness is lost on the contralesional side. Affected people report the presence of side specific phonemes, albeit extinguishing them at the same time. This points to the fact that auditory extinction, like other forms of extinction, is more about acknowledging a stimulus in the contralesional side than about the actual sensing of the stimulus. Just like other forms of extinction, auditory extinction is