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Pathological demand avoidance syndrome (PDA) is a pervasive
developmental disorder related to, but significantly different
from, Autism and Asperger syndrome (see entry Autism
Spectrum disorders, including Asperger syndrome). PDA was first
described by Professor Elizabeth Newson, who drew attention to a
group of children that often reminded people of children with
autism but seemed to be different in other ways. The profile these
children displayed didn't easily fall into diagnostic categories.
Subsequent clinical accounts and research has led to PDA being
increasingly considered as a condition within the autism
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