By Stephen L. Buka, Sc.D.
The reputed connection between early learning disabilities and later antisocial behavior and emotional disorders is not well-supported.
A new version of the Individuals with Disabilities Education Act (IDEA) was reauthorized by Congress and signed into law by President Clinton on June 4, 1997. First implemented in 1975 as the Education for All Handicapped Children Act, the law is intended to ensure that children with disabilities have access to a free, appropriate public education, and to improve educational results for children with disabilities.
The IDEA amendments of 1997 are intended to strengthen academic expectations and accountability for the nation's 5.8 million children with disabilities.
A broad range of childhood disabilities is covered, including mental retardation, hearing impairments, speech or language impairments, visual impairments, serious emotional disturbance, orthopedic impairments, autism, traumatic brain injury, other health impairments and specific learning disabilities.
The definition of learning disability (LD) is essentially unchanged from federal regulations of the past 30 years. For purposes of this critical legislation, specific learning disability means "a disorder in one or more of the basic psychological processes involved in understanding or in using language, spoken or written, which disorder may manifest itself in imperfect ability to listen, think, speak, read, write, spell or do mathematical calculations."
Included are conditions such as perceptual disabilities, brain injury, minimal brain dysfunction, dyslexia and developmental aphasia. Learning problems that are primarily the result of visual, hearing or motor disabilities, of mental retardation, of emotional disturbance, or of environmental, cultural or economic disadvantage are not included. These, then, are the legal definitions that determine which children will and will not receive special education services in the years ahead.
Contrast this broad language with definitions used in medical settings. The fourth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) states that learning disorders "are diagnosed when the individual's achievement on individually administered, standardized tests in reading, mathematics or written expression is substantially below that expected for age, schooling and level of intelligence" and when the learning problems "significantly interfere with academic achievement or activities of daily living that require reading, mathematical or writing skills."
Reading disorder, alone, accounts for four of every five cases of learning disorder. Dyslexia, the most common of learning disabilities, has been defined even more narrowly as "a specific language-based disorder of constitutional origin characterized by difficulties in single word decoding, usually reflecting insufficient phonological processing abilities. These difficulties in single word decoding are often unexpected in relation to age and other cognitive and academic abilities; they are not the result of generalized developmental disability or sensory impairment. " (operational definition of the Orton Dyslexia Society Research Committee, April 18, 1994).
Many recent scientific advances have resulted from such stringent definitions of dyslexia. Brain imaging studies now identify critical brain regions (primarily in the left cerebral hemisphere and planum temporale), identification of a core phonological processing deficit, evidence of genetic factors for both family history of reading disorders and phonologic deficits, and sophisticated new educational technologies.
We have a mismatch here between the definition of learning disabilities under the IDEA legislation and the conditions found, treated and studied in medical and research settings. They are not the same children.
In a study that I and my colleagues did of 230 adolescents seeking treatment for chemical dependence, 11 percent (26 subjects) had been diagnosed as LD by their schools. However, only six of these met formal test-based criteria. Similarly, only 13 percent of those meeting test-based criteria were diagnosed by their school systems.
Sally Shaywitz, M.D., and others at Yale University followed a representative sample of Connecticut public kindergarten students into the second grade (and beyond). By second grade, the schools had identified only half as many girls as reading-disabled than did standardized test procedures, but twice as many boys.
A valuable strategy for determining which children have a true disability is to conduct longitudinal studies, examining the persistence of deficits and associated difficulties of daily living over time. At UCLA, Paul Satz, Ph. D., reviewed the quality and results of 33 follow-up studies of children with LD. A few central findings from this work warrant mention.
First, irrespective of how childhood learning problems are defined, these studies demonstrate that the academic outlook for children with early learning problems is poor, unless a child comes from a high-income family and/or participates in high-quality educational remediation programs. Second, children with early LD are more likely to drop out of school. Third, the reputed connection between early learning disabilities and later antisocial behavior and emotional disorders is not well-supported.
Such studies can contribute greatly to current debates around the definition of LD, including potentially harmful effects of labeling and mislabeling. Is the long-term prognosis for certain forms and definitions of LD worse than for others? Are certain forms of LD more likely to persist across the life course than others? As for other forms of disorder, shouldn't we reserve the term "disability" for chronic or persistent conditions that have a poor prognosis? There are several ongoing studies worldwide that will help resolve these questions.
In addition to the Connecticut study, Lewis P. Lipsitt, Ph.D.,and colleagues at Brown University are reinterviewing a sample of 500 children with test-defined LD and 500 non-LD children in adulthood, at age 35. In addition to those with early reading problems, children with problems in writing (dysgraphia), arithmetic (dyscalcula) and spelling complete a full battery of neuropsychological, educational and cognitive tests as well as detailed life history interviews.
Preliminary results do indeed indicate that school systems ovrediagnose LD in boys and underdiagnose girls. This may account for the worse prognosis observed in this study for girls with early LD. Ongoing results from these studies should help bring together scientific advances with legislative mandates such as the reauthorization of IDEA, further ensuring that those children with the most severe forms of LD do indeed receive the free and appropriate education to which they are entitled.
|