Special EducationDisabilitiesAutism. Means a developmental disability signiﬁcantly affecting verbal and nonverbal communication and social interaction, generally evident before age 3, that adversely affects a child’s educational performance. Other characteristics often associated with autism are engagement in repetitive activities and stereotyped movements, resistance to environmental change or change in daily routines, and unusual responses to sensory experiences. The term does not apply if a child’s educational performance is adversely affected primarily because the child has an emotional disturbance as deﬁned below. A child who manifests the characteristics of “autism” after age 3 could be diagnosed as having “autism” if the criteria mentioned above are satisﬁed.Deaf-BlindnessMeans concomitant hearing and visual impairments, the combination of which causes such severe communication and other developmental and educational needs that they can not be accommodated in special education programs solely for children with deafness or children with blindness.DeafnessMeans a hearing impairment that is so severe that the child is impaired in processing linguistic information through hearing, with or without ampliﬁcation, that adversely affects a child’s educational performance.Emotional DisturbanceThe term means a condition exhibiting one or more of the following characteristics over a long period of time and to a marked degree that adversely affects a child’s educational performance: an inability to learn which can not be explained by intellectual, sensory or health factors; an inability to build or maintain satisfactory interpersonal relationships with peers and teachers; inappropriate types of behavior or feelings under normal circumstances; a general pervasive mood of unhappiness or depression; a tendency to develop physical symptoms or fears associated with personal or school problems. The term includes schizophrenia. The term does not apply to students who are socially maladjusted, unless it is determined that they have an emotional disturbance.Hearing ImpairmentMeans an impairment in hearing, whether permanent or ﬂuctuating, that adversely affectsa child’s educational performance, but that is not included under deafness in this section.Intellectual DisabilitiesMeans signiﬁcantly subaverage intellectual functioning existing concurrently with deﬁcits in adaptive behavior and manifested during the developmental period that adversely affects a child’s educational performance.