Sensory Processing Disorder (SPD, formally known as sensory integration dysfunction) is a condition in which the brain has difficulty in receiving information from the senses.
Signs and symptoms may include:
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oversensitive
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Common sounds may be overwhelming
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Uncoordinated
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Hard to engage in conversation or play
Below are a list of resources on the topic:
Medical
WebMed
Sensory Processing Disorder.com
Wikipedia
Organizations
Sensory Processing Disorder Foundation
Books
The out-of-synch-child
Raising a Sensory Smart Child