PDD not otherwise specified or PDD-NOS is a pervasive developmental disorder. PDD-NOS is a 'subthreshold' condition, in which some conditions of autism or a similar pervasive developmental disorder can be identified, while other conditions cannot be identified. Especially common is difficulty interacting with peers.
The ADHD-Autism Connection: A Step toward more accurate diagnosis and effective treatment, by Diane M. Kennedy, ISBN 1578564980 (The aim of this book is to explore the similarities that attention deficit hyperactivity disorder (ADHD) shares with a spectrum of disorders currently known as pervasive developmental disorders.)
SpectrumHaven (http://www.spectrumhaven.com)Website and support for those with PDD-NOS
PDDs are a wide spectrum of social and communication disorders, including autism, that can be complicated to diagnose.
PDDs refer to a broader group of neurobiological conditions, known as autistic spectrum disorders, that are characterized by delayed development of communication and social skills.
What is known is that PDDs are not caused by what used to be known as "the cold mother" in psychological studies (earlier notions that these disorders developed because of the emotional detachment of a child's parents have been debunked).
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