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SCHOOL-BERDASAR KLASIFIKASI INTERNALISASI GANGGUAN Public Law 108-446, Individuals with Disabilities Education Improvement Act (IDEA; 2004) is the third reauthorization of the Education for all I Iandicapped Children Act of 1975 (PL 94-142, 1975). IDEA includes definitions for the different disabilities that can be identified to entitle individuals for services, including the development of an individualized education program (EP) and the oppor-tunity to receive an education in the least restrictive environment (LRE). Emo-tional Disturbance (In) is the category used to identify individuals with internalizing disorders such as depression and anxiety. The definition for ED is quite different from (he 16M diagnostic categories. There are three main parts to the criteria for the classi (ion of El). First, the !vhavior must occur for a long time, to a severe degree, and adversely impact the child's school functioning. Second, the behavior must fall into one of the following five categories: (1) inability to learn that can't be accounted by factors such as intellectual, sensory, or health factors; (2) inability to build interpersonal relationships with peers and teachers; (3) inappropriate behaviors or feelings under normal circumstances; (4) a general, pervasive mood of depression or unhappiness; or (5) a tendency to develop physical symptoms or fears associated with personal or school prob-lems. Finally, the term ED does not apply to children who are socially mal-adjusted unless it is determined they also have an emotional disturbance. Although vague, it is relatively clear that mood disorders and anxiety disorders qualify for services under numbers 4 and 5 in the ED definition. There is no mention of etiological considerations, so internalizing disorders secondary to brain dysfunction would qualify a child for services under IDEA. MIXED ANXIETY-DEPRESSION It has been argued that Major Depression and Generalized Anxiety Disorder are closely associated in children, sometimes referred to as mixed anxiety-depression, and may be variations of the same disorder (Cannon & Weems, 2006; Clark & Watson, 1991; Moffitt et al., 2007). Andrade and colleagues (2003) found major depression to be comorbid with GAD in ten countries from North America, Latin America, Europe, and Asia. Further, during the developmental period, anxiety and depression in children follows a hetero-typic course, that is, sometimes changing symptomatic patterns between anxiety and depression (Caspi, Elder, & Bern, 1988; Ferdinand, Dieleman, Ormel oz Verhulst, 2007). The issue of comorbidity has particular relevance because there is consideration being given to including Major Depression and GAD in the same diagnostic category in upcoming revisions of the DSM. It should be noted that Kessler et al. (2008) argue, based on a longitudinal, prospective study of comorbidity, that their finding of different risk factors for GAD and Major Depression suggests these two disorders are not mani-festations of the same underlying factor. Despite this finding, the majority of published studies provide convincing evidence for the association between major depression and anxiety. TRIPARTITE MODEL OF INTERNALIZING DISORDERS The tripartite model of anxiety and depression has been provided as a framework for interpreting the high comorbidity and heterotypic nature of these two internalizing disorders (Chorpita, Plummer, & Moffitt, 2000; Clark & Watson, 1991). The model posits that the primary feature shared by anxiety and depression is negative affect. It is further hypothesized that physiological hyperarousal is associated with anxiety and low positive affect is related to depression. Subsequent studies have shown physiological hyperarousal to be positively related to panic disorder and negatively related to generalized anxiety disorder (Brown, Chorpita, Barlow, 1998; Chorpita et al., 2000). However, Greaves_Lord and colleagues (2007) have argued, based on physi-ological measurement data that it is an oversimplification to say that physiological hyperarousal is specific to anxiety and not to depression. What appears to be clear from the literature is that negative affectivity undergirds both anxiety and depression. The research on the neural basis of negative affectivity (discussed below) is therefore particularly relevant to neuropsychological understanding of internalizing disorders. DEVELOPMENTAL PSYCHOPATHOLOGY Applying neuropsychological methodologies to school-aged children and adolescents requires attention to developmental features of internalizing disorders. In very general terms the emergence of an internalizing disorder can be traced to the interaction of a physiological and biological vulnerability (diathesis) and the introduction of environmental stress, known as the diathe-sis-stress model (Charney & Manji, 2004; Earnheart et al., 2007; Miller, 1998). Studies indicate that the organization of the developing child may be affected by pervasive anxiety that is out of context or extreme reactions to neutral threats (Pathak & Perry, 2006). For example, parent modeling of affective responses inconsistent to the situation can produce a diathesis during critical early developmental periods. In regard to depression, the model was extended to identify cognitive diatheses, that is, a pattern of negative cognitions, and was called the cognitive diathesis-stress model (Hilsman & Garber, 1995). This notion of the development of internalizing disorders, that there is a predisposition toward psychopathology that is activated by stressful events, is c useful framework on which to link the burgeoning literature base on the develop-mental psychopathology of internalizing disorders.
BRAIN SYSTEMS AND INTERNALIZING DISORDERS
As indicated above, children with brain dysfunction are more susceptible to internalizing disorders (Tramontana & Hooper, 1997). This is likely due to the complex circuits that account for emotion in the human brain. That is, there is a good probability that some of the circuits involved in emotion could be involved in the general brain dysfunction. Further, as discussed above, the indirect effects of brain dysfunction in the absence of well-developed coping skills could result in internalizing symptoms such as withdrawal and feelings of helplessness.
BEHAVIOR INHIBITION SYSTEM
Gray (1995) theorized that internalizing disorders are associated with the behavioral inhibition system (BIS). The BIS is localized in the hippocampus and amygdala of the limbic system and the dorsal and ventral striatal systems of the basal ganglia. If the BIS does not develop normally and functions in an overactive state, the individual tends to experience negative affect as well as physiological arousal (Carver & Bell, 2006). This is consistent with the tripar-tite model of internalizing disorders previously discussed. Hale and Fiorello (2004) go on to conclude that children with depression and anxiety tend to have an overactive BIS accompanied by cortical overarousal that extends to the autonomic nervous system in the form of high parasympathetic reactivity.
NEUROBIOLOGY OF ANXIETY
Anxiety is a natural response associated with fundamental, primal survival instincts and is associated with the fight-or-flight response. Specifically, the activation of the threat response system by a real threat results in feelings of anxiety and fear (Pathak & Perry, 2006). The complex brain structures and circuits that have evolved over time to protect humans are also activated in anxiety disorder in which threats are generated internally. Because the threat response is so primal, some of the phylogenetically oldest parts of the brain are engaged in the response. After sensory information enters the brain, the afferent signals synapse in the ascending reticular activating system, causing arousal and alarm. Sensory information is integrated in the thalamus and transmitted to the limbic system including the amygdala and hippocampus. The subjective interpretation of the threat signals is con-ducted in the orbitofrontal cortex in concert with limbic-mediated activity (Pathak & Perry, 2006).
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