For examples, youths with DMDD may selectively attend to negative social cues (e.g., others scowling, teasing) and minimize all other information about the social events. They may also misinterpret the emotional displays of others, believing others benign actions to be hostile or threatening. Consequently, they may be more likely than their peers to act in impulsive and angry ways.Children with DMDD may also have difficulty regulating negative emotions once they are elicited. To study these problems with emotion regulation, researchers asked children with DMDD to play computer games that are rigged so that children will lose. While playing these games, children with DMDD report more agitation and negative emotional arousal than their typically developing peers. Furthermore, youths with DMDD showed markedly greater activity in the medial frontal gyrus and anterior cingulate cortex compared to other youths. These brain regions are important because they are involved in evaluating and processing negative emotions, monitoring ones own emotional state, and selecting an effective response when upset, angry, or frustrated. Altogether, these findings suggest that youths with DMDD are more strongly influenced by negative events than other youths. They may become more upset and select less effective and socially acceptable ways to deal with negative emotions when they arise. Treatment
Medication
Evidence for treatment is weak, and treatment is determined based on the physicians response to the symptoms that people with DMDD present.
amalgam particles can contaminate dental floss and lead to linear amalgam tattoos in between the teeth, especially if flossing is carried out immediately after placement of an amalgam filling with a mesial or distal aspect
Polishing of an amalgam filling
The pressure from high speed turbine dental drills can be enough to force amalgam particles into soft tissue, as may occur when an old amalgam filling is being removed
When a tooth with an amalgam filling is extracted,: 183  e.g. broken bits of amalgam filling falling into an extraction socket unnoticed
When an amalgam filling is placed in the same appointment as a tooth extracted, as may occur in "quadrant dentistry"
Apicectomies are common causes of amalgam tattoo, since the amalgam is being placed inside the alveolus and the soft tissues are replaced on topOver time, the amalgam particles embedded in the soft tissues corrode. : 183  Macrophages take up the exogenous particles, and the silver in amalgam leads to staining of collagen fibers. : 183 A similar appearance can be caused by implantation of graphite (e.g. from pencil leads), and is sometimes termed a graphite tattoo, although this is less common than tattooing with amalgam. : 138

Diagnosis
The diagnosis is clinical. : 138  Amalgam tattoo can be distinguished from other causes of localized oral pigmentation because it does not change significantly in size or color,: 138  although it may appear to slowly enlarge for several months after the initial implantation of the metal particles. : 183  Some amalgam tattoos appear radio-opaque on radiographs (i.e.