Obsessive-Compulsive Disorder (OCD) is an anxiety disorder characterized by recurring intrusive thoughts (obsessions—a source of anxiety) and/or repetitive behaviors (compulsions—attempts to reduce anxiety). Most people with OCD realize that their thoughts or behaviors are irrational, which often has the effect of further prompting the person’s anxiety. Major Depressive Disorder is a mood disorder that features a pervasive low mood accompanied by negative or critical thinking and a blunting of interest of pleasure. Sleep and appetite disturbance, as well as changes in activity level, may also occur. Depression is not uncommon; it affects nearly 8% of the US adult population. Bipolar Disorder describes a category of mood disorder defined by one or more episodes of abnormally elevated mood (mania). This may be followed or preceded by depressive symptoms. At times, the features of mania and depression may coexist (“mixed episodes”). Asperger’s Disorder (also known as Asperger’s Syndrome) is considered to be within the autistic spectrum. It is characterized by significant difficulties in social interaction, difficulty processing and responding to social cues, and unusual patterns of behavior and interests. Unlike other forms of autism, the linguistic and cognitive development of persons with Asperger’s tends to be normal.