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Pervasive developmental disorders (PDDs)
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A class of developmental disorders characterized by significantly impaired behavior or functioning in multiple areas of development
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Autism
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A pervasive disorder characterized by failure to relate to others, lack of speech, disturbed motor behaviors, intellectual impairment, and demands for sameness in the environment.
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Asperger's disorder
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A pervasive developmental disorder characterized by social deficits and stereotyped behavior but without the significant language or cognitive delays associated with autism.
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Rett's disorder
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A pervasive developmental disorder characterized by a range of physical, behavioral, motor, and cognitive abnormalities that begin after a few months of apprently normal behavior.
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Childhood disintegrative disorder
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A pervasive developmental disorder involving loss of previously acquired skills and abnormal functioning following a period of apparently normal development during the first 2 years of life.
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Mental retardation
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A generalized delay or impairment in the development of intellectual and adaptive abilities
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Down syndrome
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A condition caused by the presence of an extra chromosome on the 21st pair and characterized by mental retardation and various physical anomalies.
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Fragile X syndrome
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An inherited form of mental retardation cause by a mutated gene on the X chromosome
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Phenylketonuria (PKU)
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A genetic disorder that prevents the metabolization of phenylpyruvic acid, leading to mental retardation unless the diet is strictly controlled
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Cultural-familial retardation
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A mild form of mental retardation that is influenced by impoverishment of the home environment
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Communication disorders
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A class of psychological disorders characterized by difficulties in understanding or using language
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Attention-deficit hyperactivity disorder (ADHD)
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A behavior disorder characterized by excessive motor activity and inability to focus one's attention
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Hyperactivity
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An abnormal behavior pattern characterized by difficulty in maintaining attention and extreme restlessness
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Conduct disorder
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A psychological disorder in childhood and adolescence characterized by disruptive, antisocial behavior
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Oppositional defiant disorder (ODD)
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A psychological disorder in childhood and adolescence characterized by excessive oppositionality or tendencies to refuse requests from parents and others.
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