Asperger Syndrom
Asperger's Syndrome:Guidelines for Assesment and Diagnosis
by Ami Klin, Ph.D., and Fred R. Volkmar, M.D.Yale Child Study Center, New Haven, Ct.
Published by the Learning Disabilities Association of America, June 19954156 Library RoadPittsburgh, PA 15234(412) 341-1515
Introduction
Asperger Syndrome (AS) is a severe developmental disorder characterized by major difficulties in social interaction, and restricted and unusual patterns of interest and behavior. There are many similarities with autism without mental retardation (or "Higher Functioning Autism"), and the issue of whether Asperger syndrome and Higher Functioning Autism are different conditions is not resolved. To some extent, the answer to this question depends on the way clinicians and researcher make use of this diagnostic concept, since until recently there was no "official" definition of Asperger syndrome. The lack of a consensual definition led to a great deal of confusion as researchers could not interpret other researchers' findings, clinicians felt free to use the label based on their own interpretations or misinterpretations of what Asperger syndrome "really" meant, and parents were often faced with a diagnosis that nobody appeared to understand very well, and worse still, nobody appeared to know what to do about it. School districts ere not aware of the condition, insurance carriers could not reimburse services provided on the basis of this "unofficial" diagnosis, and there was no published information providing parents and clinicians alike with guidelines on the meaning and implications of Asperger syndrome, including what should the diagnostic evaluation consist of and what forms of treatment and interventions were warranted. This situation has changed somewhat since Asperger syndrome was made "official" in DSM-IV (APA, 1994), following a large international field trial involving over a thousand children and adolescents with autism and related disorders (Volkmar et al., 1994).
Categorical Definition and Clinical Description
As defined in DSM-IV (the most recent Diagnostic and Statistical Manual of the American Psychiatric Association, 1994), the tentative criteria for AS follow the same format, and in fact overlap to some degree, the criteria for autism. The required symptomatology is clustered in terms of onset, social and emotional, and "restricted interests" criteria, with the addition of two common but not necessary characteristics involving motor deficits and isolated special skills, respectively. A final criterion involves the necessary exclusion of other conditions, most importantly autism or a subthreshold (or "autistic-like") form of autism (Pervasive Developmental Disorder - Not Otherwise Specified). Interestingly, the DSM-IV definition of AS is offered having autism as its point of reference; hence some of the criteria actually involve the absence of abnormalities in some areas of functioning that are affected in autism. The following table summarizes the DSM-IV definition of AS: DSM-IV definition of Asperger Syndrome (called "Asperger Disorder") (APA, 1994)
A. Qualitative impairment in social interaction, as manifested by at least two of the following:
Onset criteria
Qualitative Impairments in Communication
In contrast to autism, there are no symptoms in this area of functioning in the definition of AS. Although significant abnormalities of speech are not typical of AS, there are at least three aspects of these individuals' communication skills which are of clinical interest. First, though inflection and intonation may not be as rigid and monotonic as in autism, speech may be marked by poor prosody. For example, there may a constricted range of intonation patterns that is used with little regard to the communicative functioning of the utterance (assertions of fact, humorous remarks, etc.). Second, speech may often be tangential and circumstantial, conveying a sense of looseness of associations and incoherence. Even though in some cases this symptom may be an indicator of a possible thought disorder, it is often the case that the lack of coherence and reciprocity in speech is a result of the one-sided, egocentric conversational style (e.g., unrelenting monologues about the names, codes, and attributes of innumerble TV stations in the country), failure to provide the background for comments and to clearly demarcate changes in topic, and failure to suppress the vocal output accompanying internal thoughts. The third aspect typifying the communication patterns of individuals with AS concerns the marked verbosity observed, which some authors see as one of the most prominent differential features of the disorder. The child or adult may talk incessantly, usually about their favorite subject, often in complete disregard to whether the listener might be interested, engaged, or attempting to interject a comment, or change the subject of conversation. Despite such long-winded monologues, the individual may never come to a point or conclusion. Attempts by the interlocutor to elaborate on issues of content or logic, or to shift the interchange to related topics, are often unsuccessful. Despite the possibility that all of these symptoms may be accounted for in terms of significant deficits in pragmatics skills and/or lack of insight into, and awareness of, other people's expectations, the challenge remains to understand this phenomenon developmentally as strategies of social adaptation.
Restrictive, repetitive, and stereotyped patterns of behavior, interests, and activities
Motor Clumsiness
Assessment
History
A careful history should be obtained, including information related to pregnancy and neonatal period, early development and characteristics of development, and medical and family history. A review of previous records including previous evaluations should be performed and the information incorporated and results compared in order to obtain a sense of course of development. Additionally, several other specific areas should be directly examined because of their importance in the diagnosis of AS. These include a careful history of onset/recognition of the problems, development of motor skills, language patterns, and areas of special interest (e.g., favorite occupations, unusual skills, collections). Particular emphasis should be placed on social development, including past and present problems in social interaction, patterns of attachment of family members, development of friendships, self-concept, emotional development, and mood presentation.
Psychological Assessment
This component aims at establishing the overall level of intellectual functioning, profiles of strengths and weaknesses, and style of learning. The specific areas to be examined and measured include neuropsychological functioning (e.g., motor and psychomotor skills, memory, executive functions, problem-solving, concept formation, visual-perceptual skills), adaptive functioning (degree of self-sufficiency in real-life situations), academic achievement (performance in school-like subjects), and personality assessment (e.g., common preoccupations, compensatory strategies of adaptation, mood presentation). The neuropsychological assessment of individuals with AS involves certain procedures of specific interest to this population. Whether or not a Verbal-Performance IQ discrepancy is obtained in intelligence testing, it is advisable to conduct a fairly comprehensive neuropsychological assessment including measures of motor skills (coordination of the large muscles as well as manipulative skills and visual-motor coordination, visual-perceptual skills) gestalt perception, spatial orientation, parts-whole relationships, visual memory, facial recognition, concept formation (both verbal and nonverbal), and executive functions. A recommended protocol would include the measures used in the assessment of children with Nonverbal Learning Disabilities (Rourke, 1989). Particular attention should be given to demonstrated or potential compensatory strategies: for example, individuals with significant visual-spatial deficits may translate the task or mediate their responses by means of verbal strategies or verbal guidance. Sch strategies may be important for educational programming.
Communication Assessment
Psychiatric Examination
The psychiatric examination should include observations of the child during more and less structured periods: for example, while interacting with parents and while engaged in assessment by other members of the evaluation team. Specific areas for observation and inquiry include the patient's patterns of special interest and leisure time, social and affective presentation, quality of attachment to family members, development of peer relationships and friendships, capacities for self-awareness, perspective-taking and level of insight into social and behavioral problems, typical reactions in novel situations, and ability to intuit other person's feelings and infer other person's intentions and beliefs. Problem behaviors that are likely to interfere with remedial programming should be noted (e.g., marked aggression). The patient's ability to understand ambiguous nonliteral communications (particularly teasing and sarcasm) should be examined (as, often, misunderstandings of such communications may elicit aggressiv behaviors). Other areas of observation involve the presence of obsessions or compulsions, depression, anxiety and panic attacks, and coherence of thought.
Treatment and Intervention
(See also our Treatment and Intervention "Guidelines") As in autism, treatment of AS is essentially supportive and symptomatic. Special educational services are sometimes helpful, although there is, as yet, very little reported experience on the effectiveness of specific interventions. Acquisition of basic skills in social interaction as well as in other areas of adaptive functioning should be encouraged. Supportive psychotherapy focused on problems of empathy, social difficulties, and depressive symptoms may be helpful, although it is usually very difficult for individuals with AS to engage in more intensive, insight-oriented psychotherapy. Associated conditions, such as depression, may be effectively treated. Despite the paucity of published information on intervention strategies and issues, a few guidelines may be offered based on informal observations made by experienced clinicians, intervention strategies used with individuals with high-functioning autism, and Rourke's (1989) suggested interventions for individuals with Nonverbal Learning Disabilities syndrome.
Securing services
The authorities who decide on entitlement to services are usually unaware of the extent and significance of the disabilities in AS. Proficient verbal skills, overall IQ usually within the normal range, and a solitary life style often mask outstanding deficiencies observed primarily in novel or otherwise socially demanding situations, thus decreasing the perception of the very salient needs for supportive intervention. Thus, active participation on the part of the clinician, together with parents and possibly an advocate, to forcefully pursue the patient's eligibility for services is needed. It appears that, in the past, many individuals with AS were diagnosed as learning disabled with eccentric features, a nonpsychiatric diagnostic label that is much less effective in securing services.
Learning
Skills, concepts, appropriate procedures, cognitive strategies, and so on, may be more effectively taught in an explicit and rote fashion using a parts-to-whole verbal instruction approach, where the verbal steps are in the correct sequence for the behavior to be effective. Additional guidelines should be derived from the individual's neuropsychological profile of assets and deficits; specific intervention techniques should be similar to those usually employed for many subtypes of learning disabilities, with an effort to circumvent the identified difficulties by means of compensatory strategies, usually of a verbal nature. If significant motor and visual-motor deficits are corroborated during the evaluation, the individual should receive physical and occupational therapies. The latter should not only focus on traditional techniques designed to remediate motor deficits, but should also reflect an effort to integrate these activities with learning of visual-spatial concepts, visual-spatial orientation, and bod awareness.
Adaptive functioning
The acquisition of self-sufficiency skills in all areas of functioning should be a priority in any plan of intervention. The tendency of individuals with AS to rely on rigid rules and routines can be used to foster positive habits and enhance the person's quality of life and that of family members. The teaching approach should follow closely the guidelines set above (see Learning), and should be practiced routinely in naturally occurring situations and across different settings in order to maximize generalization of acquired skills.
Maladaptive behaviors
Specific problem-solving strategies, usually following a verbal rule, may be taught for handling the requirements of frequently occurring, troublesome situations (e.g., involving novelty, intense social demands, or frustration). Training is usually necessary for recognizing situations as troublesome and for selecting the best available learned strategy to use in such situations.
Social and communication skills
These skills are possibly best taught by a communication specialist with an interest in pragmatics in speech. Alternatively, social training groups may be used if there are enough opportunities for individual contact with the instructor and for the practicing of specific skills. Teaching may include the following:
Self-support
As individuals with AS are usually self-described as loners despite an often intense wish to make friends and have a more active social life, there is a need to facilitate social contact within the context of an activity-oriented group (e.g., church communities, hobby clubs, and self-support groups). The little experience available with the latter suggests that individuals with AS enjoy the opportunity to meet others with similar problems and may develop relationships around an activity or subject of shared interest.
Pharmacotherapy
Although little information about pharmacological interventions with individuals with AS is available, a conservative approach based on the evidence from autism should probably be adopted (McDougle, Price, and Volkmar, 1994). In general, pharmacological interventions with young children are probably best avoided. Specific medication might be indicated if AS is accompanied by debilitating depressive symptoms, severe obsessions and compulsions, or a thought disorder. It is important for parents to know that medications are prescribed for the treatment of specific symptoms, and not to treat the disorder as a whole.
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