P300 Latency and Cognitive Ability
From infancy, cognitive deficiencies are apparent in all individuals with Down syndrome (Morss, 1983). The mean IQ for children with this syndrome is approximately 40–50, but varies widely from severely retarded (IQ around 10) to low-normal (IQ around 90) intelligence (Connolly, 1978). Along with the wide range of abilities found in Down Syndrome, instability of the measures of cognitive performance is characteristic (Morss, 1983). Current tests of cognitive functioning do not provide for good generalizability across levels of development in children with Down syndrome (Hartley, 1986). The difficulty in finding tests of mental ability appropriate for the individual with this syndrome is perhaps the source of conflicting reports about the abilities of Down syndrome populations. Therefore, developmental norms on tests of general mental ability are needed, norms that are applicable to individuals with a wide range of cognitive abilities and that are not greatly affected by a lack of cooperation.
KeywordsDepression Leukemia Dementia
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